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Tutorial Fisika (Physics Tutorial) physics complete. search your articles on the right sites Telusuri
Kamis, 30 Mei 2013
Wikipedia
Can You "Feel" Temperature?
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Another fine video, and might answer the question (if you have it) on why a metal feels colder than a book, even when both are at the same temperature. Translate
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Bahan Ajar Fisika: Inti Atom dan Radioaktivitas Kelas: XII Semester: 2 Isi Materi: Bahan ajar ini membahas tentang inti atom dan radioaktivitas dilengkapi dengan contoh soal dan uji kompet... MOOC On "The Discovery Of The Higgs Boson" The registration is now open for the massive online open course (MOOC) on " The Discovery of the Higgs Boson ". This MOOC intro... Contact Contact Me If you have any questions regarding the content in this website, about the products that are mentioned, or just any questions at ...
Zz.
di 20.31
Makalah Gerak Harmonis Sederhana Hai Sobat fisika, pada postingan kali ini saya akan memberikan salah-satu koleksi makalah sewaktu saya kuliah dulu... makalah ini...
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Label: Education, Thermodynamics, Video
Moment of Inertia - July -Dec 2008 Revision Moment of Inertia Torque created by external forces in rotating motion When a particle is rotating it has tangential acceleration and radial...
Makalah Fisika, Elektronika Digital
REACTION: Generate Complete Viable Oxidative Hydrocarbon Mechanisms This software program, the place the primary application has been in combustion processes, is used to automatically generate complete viable...
Ilustrasi: Elektronika digital Hai Sobat Fisika, Seperti pada postingan sebelumnya saya telah memberikan sebuah makalah yang membahas tentang bilangan kuantum, nah pada postingan kali ini saya juga akan memberikan lagi sebuah makalah tapi dengan pembahasan yang berbeda, pada makalah yang akan saya berikan kali ini membahasa tentang elektronika digital, berikut sedikit penjelasan tentang apa
di 18.34
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Label: makalah
Remote quantum applications, teleportation enabled by calling long distance between superconducting qubits Schematic of the superconducting optical interface (Phys.org) —Researchers have developed a way for superconducting quantum chips to tal... Toward quantum technologies Quantum mechanics is about to fundamentally change the way we can transmit and sense information. The idea is that information—represen...
Makalah Fisika, Bilangan Kuantum Hai Sobat Fisika, pada postingan kali saya akan memberikan salah satu makalah yang saya buat sewaktu kuliah dulu pada makalah ini membahas tentang bilangan kuantum, untuk lebih jelasnya silahkan teman-teman simak pembahasan makalah tersebut, sebagai berikut:
TUGAS 1 FISIKA KELAS XI IPA 1. Sebuah partikel bergerak searah dengan sumbu x , percepatannya a = 5t + 4 (a dalam m/s 2 dan t dalam detik). Mula-mula partikel t... Electrons' split 'personalities' help solve physics mystery SHUTTERSTOCK Electrons, the negatively charged particles around atoms, have split "personalities," and act one way or ...
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Perkembangan model atom diusulkan oleh beberapa ahli dimulai dari John
di 18.14
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Label: makalah
Download Diktat Fisika Instrumentasi Hai sobat Fisika, kali ini saya akan memberikan diktat atau modul untuk mata kuliah instrumentasi, berikut saya berikan penjelasan singkat mengenai apa dan bagaimna itu mata kuliah intrumentasi; Mata kuliah adalah mata kuliah wajib yang merupakan pengantar bagi mahasiswa Fisika yang ingin memasuki kajian instrumentasi lebih lanjut. Selesai mengikuti perkuliahan ini mahasiswa diharapkan mampu Ada kesalahan di dalam gadget ini di 17.58
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Label: download, E-Book
Arduino Robot
PHYSICS - UPDATE DAILY 1
" The Arduino Robot is the first robotics platform officially supported by Arduino.cc. It arrives fully assembled and nearly ready to run with no soldering required. Just plug in the color LCD screen, charge up the batteries (included), launch the Arduino IDE and upload the example code over the USB cable. The robot comes with a number of integrated inputs; two potentiometers, five buttons, a digital compass, five floor sensors, and an SD card reader. It also has a speaker, two motors, and a color screen as outputs, and plenty of prototyping space and TinkerKit connectors for expansion" http://blog.makezine.com/2013/05/28/now-available-in-the-maker-shed-the-new-arduino-robot/
di 08.24
Podcast: Diversity in physics, and life in an asteroid impact site - Nature.com - June 1, 2018 - The Wild Physics of a Firefighter's Window Catch WIRED - June 1, 2018 - Physics of footballs, FIFA 2018 World Cup probabilities revealed - physicsworld.com - June 1, 2018 - Do we fall too easily for beautiful laws in physics? Siliconrepublic.com - June 1, 2018 - ASU physics alum Harry Kolar earns IBM fellowship | ASU Now ... - Arizona State University - May 31, 2018 -
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Label: Invenzioni PHYSICS - UPDATE DAILY
Selasa, 28 Mei 2013
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Where Are All Those Doomsayers Now? It's about time someone calls out those crackpots who predicted all those apocalyptic end-of-the-earth scenarios. This is especially true with the LHC and all that nonsense about it destroying the earth.
These prophesies share something else as well. Whenever an apocalyptic prediction fizzles, the doomsayers remain strangely silent — until the next opportunity to capture the public’s imagination. The new millennium did not bring down airplanes or knock out power grids; but no software engineer has confessed that the Y2K scare was a con — or at least a serious mistake — that cost the United States alone an estimated $300 billion. On the contrary, some have begun to warn that, in 2038, certain computer software and systems will experience “integer overflow,” causing them to report negative system times and, in turn, to fail. The interval between a doomsday prophecy’s fall and the rise of the next one evidently is decreasing, perhaps owing to the accelerating pace of modern life — and, with it, the acceleration of forgetting, which enables potential beneficiaries to capitalize. Last year’s misinterpretation of the Mayan calendar clearly helped — and was probably helped by — the proprietors of some Yucatan hotels, which reached 100-per-cent occupancy in the weeks surrounding the world’s projected end. Unfortunately, these crackpots would not get any kind of free publicity were it not for the media that seem eager to jump to such sensational story.
Unfortunately, mainstream media outlets are eager to provide a platform for fear-mongers. Doom sells; scientific empiricism, not so much. In an increasingly cutthroat media culture — in which falling behind a story is often considered worse than making a mistake — serious journalism has largely given way to infotainment and sensationalism. For example, in 2008, the Russian physicist Grigory Vilkovisky claimed to have proved that black holes radiate away only about half of their mass — contrary to Stephen Hawking’s celebrated finding that they radiate away their entire mass. At the time, I wrote that, if Vilkovisky were correct, accepted ideas about black-hole physics would have to be radically altered, and “black holes created at CERN might actually survive long enough to be taken seriously.” While I intended only to suggest that the black holes would be considered seriously as a scientific phenomenon, my words were interpreted to mean that the black holes could pose a serious threat to Earth.
Anyone who has written a science article for the public, or have science blogs, will inevitably encounter something such as this:
On the other hand, the rising incidence of false prophecy might equally reflect the increasing prevalence of charlatanism masquerading as science. Each time I publish a scientific essay, I attract the attention of a dozen self-proclaimed messiahs eager to impart their divinely inspired ideas, which invariably lack higher mathematics (or, in the case of the black-hole sentinels, rely on elevated but meaningless mathematics). Their conviction that they represent the Alpha and Omega of knowledge is as rigid as their scientific illiteracy.
I certainly have. I lost count on how many "comments" I had to delete coming from people who claim to have solved the entire mystery of the universe. Love that DELETE button on Blogger. I've ever used the MARK AS SPAM on habitual crackpots who can't seem to get a clue that none of their garbage will ever get free advertisements on here. Ah, such fun! Zz.
di 06.17
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Label: Bad physics, General Public and Science, LHC, Mass Media
Philosophy Isn't Dead Yet? This is a rather strange article. The author is arguing that the problems that physicists are dealing with right now shows that philosophers are still needed. He presented several different major questions being dealt with in physics, including QM/GR unification, the measurement problem in QM, and the question of what is "time"?
But there could not be a worse time for philosophers to surrender the baton of metaphysical inquiry to physicists. Fundamental physics is in a metaphysical mess and needs help. The attempt to reconcile its two big theories, general relativity and quantum mechanics, has stalled for nearly 40 years. Endeavours to unite them, such as string theory, are mathematically ingenious but incomprehensible even to many who work with them. This is well known. A better-kept secret is that at the heart of quantum mechanics is a disturbing paradox – the so-called measurement problem, arising ultimately out of the Uncertainty Principle – which apparently demonstrates that the very measurements that have established and confirmed quantum theory should be impossible. Oxford philosopher of physics David Wallace has argued that this threatens to make quantum mechanics incoherent which can be remedied only by vastly multiplying worlds. Beyond these domestic problems there is the failure of physics to accommodate conscious beings. The attempt to fit consciousness into the material world, usually by identifying it with activity in the brain, has failed dismally, if only because there is no way of accounting for the fact that certain nerve impulses are supposed to be conscious (of themselves or of the world) while the overwhelming majority (physically essentially the same) are not. In short, physics does not allow for the strange fact that matter reveals itself to material objects (such as physicists). And then there is the mishandling of time. The physicist Lee Smolin's recent book, Time Reborn, links the crisis in physics with its failure to acknowledge the fundamental reality of time. Physics is predisposed to lose time because its mathematical gaze freezes change. Tensed time, the difference between a remembered or regretted past and an anticipated or feared future, is particularly elusive. This worried Einstein: in a famous conversation, he mourned the fact that the present tense, "now", lay "just outside of the realm of science".
I'm scratching my head here because these are all physics issues. I do not see how philosophy could SOLVE any of those, because inevitably, what will resolve these issues are accurate physical theories AND experimental verification. Last time I checked, none of those are done in philosophy. In fact, I would even put it to you that the reason why some parts of physics are in "such a mess" IS because they have neglected a major aspect of physics, which is the experimental part. To paraphrase Brian Greene in his "Elegant Universe" TV series, if String theory cannot provide a way to produce an experimentally measurable effect, it isn't physics, but rather a philosophy! So I can easily turn this around and say that this mess is caused by a "philosophy" rather than by physics. And this is generally the case in physics when there isn't a sufficient body of experimental evidence YET. Lacking a set of decisive experiments, many different scenarios can fit into the same set of observations. So you end up with competing but different ideas, all claiming equal validity. That is why experiments are so important, and why continued refinement of existing experiments and continued performance of new experiments are needed to weed out which idea is valid. That is how physics and science in general have worked. It is just that it is taking long and longer now for that to occur because the problems are getting to be more and more difficult to solve. Zz.
di 05.48
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Label: philosophy
Senin, 27 Mei 2013
Skripsi Fisika, Studi Perbandingan Daya Hantar Listrik pada Buah Dengen, Lemon dan Belimbing Wuluh Hai sobat Fisika, kali ini saya akan memberikan sebuah skripsi teman saya sewaktu kuliah dulu, judulnya adalah " Studi Perbandingan Daya Hantar Listrik pada Buah Dengen, Lemon dan Belimbing Wuluh " , skripsi ini dibuah oleh teman saya yang bernama Chorina Octavia. S,si. kepada beliau saya ucapkan terima kasih karna telah di izinkan untuk menyebar luaskan hasil karyanya, okelah kalo begitu
di 23.10
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Label: Skripsi
Skripsi Fisika, Studi Perbandingan Kulit Buah Sebagai Pengganti Karbon Baterai Hai Sobat Fisika, kali ini saya akan memberikan sebuah skripsi teman saya sewaktu kuliah dulu, judulnya adalah "Studi Perbandingan Kulit Buah Sebagai Pengganti Karbon Baterai " , skripsi ini dibuah oleh teman saya yang bernama Israwati. S,si. kepada beliau saya ucapkan terima kasih karna telah di izinkan untuk menyebar luaskan hasil karyanya, okelah kalo begitu tanpa memperpanjang lebar lagi
di 22.56
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Label: Skripsi
Minggu, 26 Mei 2013
GELOMBANG ELEKTROMAGNETIK (1) Gelombang Elektromagnetik adalah gelombang yang dapat merambat walau tidak ada medium. Energi elektromagnetik merambat dalam gelombang dengan beberapa karakter yang bisa diukur, yaitu: panjang gelombang/wavelength, frekuensi, amplitude/amplitude, kecepatan. Amplitudo adalah tinggi gelombang, sedangkan panjang gelombang adalah jarak antara dua puncak. Frekuensi adalah jumlah gelombang yang melalui suatu titik dalam satu satuan waktu. Frekuensi tergantung dari kecepatan merambatnya gelombang. Karena kecepatan energi elektromagnetik adalah konstan (kecepatan cahaya), panjang gelombang dan frekuensi berbanding terbalik. Semakin panjang suatu gelombang, semakin rendah frekuensinya, dan semakin pendek suatu gelombang semakin tinggi frekuensinya.Energi elektromagnetik dipancarkan, atau dilepaskan, oleh semua masa di alam semesta pada level yang berbeda-beda. Semakin tinggi level energi dalam suatu sumber energi, semakin rendah panjang gelombang dari energi yang dihasilkan, dan semakin tinggi frekuensinya. Perbedaan karakteristik energi gelombang digunakan untuk mengelompokkan energi elektromagnetik. Ciri-ciri gelombang elektromagnetik : 1. Perubahan medan listrik dan medan magnetik terjadi pada saat yang bersamaan, sehingga kedua medan memiliki harga maksimum dan minimum pada saat yang sama dan pada tempat yang sama. 2. Arah medan listrik dan medan magnetik saling tegak lurus dan keduanya tegak lurus terhadap arah rambat gelombang. 3. gelombang elektromagnetik merupakan gelombang transversal. 4. Seperti halnya gelombang pada umumnya, gelombang elektromagnetik mengalami peristiwa pemantulan, pembiasan, interferensi, dan difraksi. Juga mengalami peristiwa polarisasi karena termasuk gelombang transversal. 5. Cepat rambat gelombang elektromagnetik hanya bergantung pada sifat-sifat listrik dan magnetik medium yang ditempuhnya.
Cahaya yang tampak oleh mata bukan semata jenis yang memungkinkan radiasi elektromagnetik. Pendapat James Clerk Maxwell menunjukkan bahwa gelombang elektromagnetik lain, berbeda dengan cahaya yang tampak oleh mata dalam dia punya panjang gelombang dan frekuensi, bisa saja ada. Kesimpulan teoritis ini secara mengagumkan diperkuat oleh Heinrich Hertz, yang sanggup menghasilkan dan menemui kedua gelombang yang tampak oleh mata yang diramalkan oleh Maxwell itu. Beberapa tahun kemudian Guglielmo Marconi memperagakan bahwa gelombang yang tak terlihat mata itu dapat digunakan buat komunikasi tanpa kawat sehingga menjelmalah apa yang namanya radio itu. Kini, kita gunakan juga buat televisi, sinar X, sinar gamma, sinar infra, sinar ultraviolet adalah contoh-contoh dari radiasi elektromagnetik. Semuanya bisa dipelajari lewat hasil pemikiran Maxwell. SUMBER GELOMBANG ELEKTROMAGNETIK Osilasi listrik. Sinar matahari menghasilkan sinar infra merah. Lampu merkuri menghasilkan ultra violet. Penembakan elektron dalam tabung hampa pada keping logam menghasilkan sinar X (digunakan untuk rontgen). Inti atom yang tidak stabil menghasilkan sinar gamma.
di 18.37
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Label: MATERI KELAS X GENAP
Skripsi Fisika, Studi Perbandingan Daya Listrik Antara Lampu Pijar dengan Lampu CFL
Hai Sobat Fisika, kali ini saya akan memberikan sebuah skripsi teman saya sewaktu kuliah dulu, judulnya adalah " Studi Perbandingan Daya Listrik Antara Lampu Pijar dengan Lampu CFL " , skripsi ini dibuah oleh teman saya yang bernama Sabil Basir. S,si. kepada beliau saya ucapka terima kasih karna telah di izinkan untuk menyebar luaskan hasil karyanya, okelah kalo begitu tampa memperpanjang
di 11.16
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Label: Skripsi
Acceleration doesn't "move." Acceleration "is." The big misconceptions about acceleration boil down to thinking that "acceleration" means the same thing as "velocity." Other than repetition and drill, I think the best way to bust the misconceptions is to make students write. I might ask, "What is the direction of the car's acceleration? Justify your answer." For years, I would accept for full or almost-full credit an answer like "The problem says the car is going west, but the car is slowing down. Slowing down means acceleration must move opposite the direction the car is going, so acceleration is east." This year, I put my foot down. That answer earned zero or almost-zero credit, to my students' considerable protest and dismay: "My answer's right," they said. "The acceleration is east." Yes, but the justification is wrong.
"No it's not. You have a fact right here in the notes that says slowing down means acceleration and velocity move opposite each other."
That's emphatically NOT what I said. Acceleration does not "move." Acceleration "is." The correct justification says that "the acceleration IS opposite the direction of motion." When you say "acceleration moves east," you're implying that acceleration and motion are the same thing.
"Oh, come on, now. The car's moving, isn't it?" Sure, but the direction of the motion is the direction of velocity. Acceleration does not have to be in the direction of motion.
"So you're going to take off all those points 'cause I got one word wrong?"
Conversation over -- I don't discuss points, only physics. The correct response here, student, is to pledge not to ever again refer to acceleration as "moving.\
Was it worth fighting with whiny freshmen who thought they knew physics better than I? Absolutely. We just finished three weeks of review for the cumulative final exam. Of all the mechanics topics we covered, motion was the one they handled best. Mistakes about the amount or direction of acceleration were rarer than ever. The other major differences in my approach to kinematics this year was using units of "m/s per second" for acceleration rather than m/s 2. I know that helped get students understanding what the magnitude of an acceleration meant. But I think the key to getting the direction right was fighting to eliminate the phrase "acceleration moves."
di 08.07
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The Rio Phyz Pinhole Camera: As big as a classroom Apologies for being so long away. Due to a pre-Prop 30 budget scare, we scheduled our graduation ceremony three weeks early. The dominos that cascaded from that decision landed squarely on my blog time. But now I'm back with a doozie! With three weeks of time to kill in a post-AP Exam, post-graduation situation, what to do with the handful of non-seniors in AP Physics? Robust, rigorous academic instruction? No. It's ad lib time. We enjoyed a bit of cinema with some of my personal faves, Atomic Café and For All Mankind. I'll keep my Koyaanisqatsi powder dry for the moment, but I make no promises. Thursday and Friday, we turned the classroom into a camera obscura: a giant pinhole camera! Here's the crew blacking out the room with 6 mil black plastic sheeting. These are Rio's best and brightest, and they work fast!
Otherwise jaded high school students distracted by the approach of summer vacation are genuinely wowed by the resulting image creation. The giant camera obscura is best experienced live and in person. From the dark of the classroom, the wall opposite the pinhole is illuminated with moving ghostly images of whatever is going on in the courtyard outside our classroom, made even eerier by the imagery's reversal about the origin. But just for fun, I shot a couple of stills. 1. The celebration of entropy that is my classroom. Careful observers will see the devastating earthquake damage visited upon the room from the previous night's temblor.
2. Lights Out: the pinhole is on the windows to the right. Our Dark Side of the Moon mural gets a full measure of sunshine in the afternoon. It's full-color image lands on my front boards.
3. Ectoplasmic filter. I've been teaching in room B-8 longer than my students have been alive. Although I'm not even dead yet, my spirit haunts the room. Spooky!
Thanks to Dr. Rick Michaels (Bella Vista High School, retired) for the idea. All images shot on my Lumix DMC-FZ200 digicam, processed with Apple's Aperture 3. A wired remote was employed to execute the intervalometer function; time lapse stills sequenced into a video file by Apple QuickTime Pro 7.
di 00.49
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Label: AP physics, groovy, Optics, web video
Jumat, 24 Mei 2013
More Electricity Review Sheet Practice
https://docs.google.com/document/d/1eZoVd-F6ku9o-qCF0c_SnGRQgO1eZ93p5Rl3b5_St1I/pub
di 15.53
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Linothorax Da Wikipedia "The linothorax is a modern term conventionally used to describe a type of upper body armor used by the Ancient Greeks, as well as other civilizations, from the Mycenaean Period through the Hellenistic Period. It is based on the Greek (in Homer ), which strictly is an adjective meaning "wearing a breastplate of linen" (and is not a noun meaning "linen armor" as often stated); the "linothorax" was made of linen, while a "thorax" was made of metal. The earliest attested account of a "linothorax" used for battle is recorded in Book 2 of Homer's Iliad (2.529 and 2.830). It is worn by Ajax the Lesser and is described in brief. Homer, composing long before the great armies of Athens, Thebes, Sparta or Alexander the Great, surely understood what the armor was. But the extent to which it was used can not be fully determined. An educated guess can be made, however, based on its use by Alexander the Great, and its mention by other sources such as Herodotus (2.182, 3.47, 7.63), Livy (4.19.2–20.7) and Strabo (Geography, 3.3.6, 13.1.10), and many others. The linothorax appears to have been used in place of the bronze 'bell cuirass' as the popular choice of armour for Greek hoplites, starting perhaps around the late seventh century and early sixth century B.C. Its high point, if vase paintings, sculptural reliefs and artistic depictions are to be believed, corresponds with the time of the Persian Wars. By the time of the Peloponnesian War it was still used, and continued to seemingly flourish well into the Hellenistic Period."
di 11.47
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Label: Composite materials
After 150 years, the Stirling motor lives
The Sydney Morning Herald, 26 May, 1975 Ford Torino Stirling Special
di 11.24
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Label: Invenzioni
Ford Torino Stirling Special
da Modello matematico di motore Stirling accoppiato ad un generatore elettrico lineare, Michele Favaron http://tesi.cab.unipd.it/37661/1/Modello_matematico_di_motore_Stirling_accoppiato_ad_un_generatore_lineare.pdf
di 11.01
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Label: Invenzioni
Motore di Stirling fatto in casa Su YouTube cercando "motore stirling fatto in casa" trovate diversi progetti per crearvi il vostro "motore".
di 10.51
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Label: Invenzioni
A liquid telescope http://en.wikipedia.org/wiki/Liquid_mirror_telescope Liquid mirror telescopes are telescopes with mirrors made with a reflective liquid. The most common liquid used is mercury. The container for the liquid is rotating so that the liquid assumes a paraboloidal shape. A paraboloidal shape is precisely the shape needed for the primary mirror of a telescope. The rotating liquid assumes the paraboloidal shape regardless of the container's shape. Liquid mirrors can be a low cost alternative to conventional large telescopes. Compared to a solid glass mirror that must be cast, ground, and polished, a rotating liquid metal mirror is much less expensive to manufacture. "Isaac Newton noted that the free surface of a rotating liquid forms a circular paraboloid and can therefore be used as a telescope, but he could not actually build one because he had no way to stabilize the speed of rotation[citation needed] (the electric motor did not exist yet). The concept was further developed by Ernesto Capocci of the Naples Observatory (1850), but it was not until 1872 that Henry Skey of Dunedin, New Zealand constructed the first working laboratory liquid mirror telescope." "Another difficulty is that a telescope with a liquid metal mirror can only be used in zenith telescopes that look straight up at the zenith, so it is not suitable for investigations where the telescope must remain pointing at the same location of space ... Currently, the mercury mirror of the Large Zenith Telescope in Canada is the largest liquid metal mirror in operation. It has a diameter of six meters, and rotates at a rate of about 8.5 revolutions per minute."
di 10.37
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Label: Astrophysics, science, Storia della scienza
n.28 - cilindro che rotola ...
Problema esame Prof. Mussino
di 09.13
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Label: esercizi corpo rigido, esercizio esame
Variazione entropia Un esercizio del prof. Mussino che propone un semplice calcolo della variazione d'entropia.
di 08.41
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Label: esercizi termodinamica
n.10 - Volano
di 08.36
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Label: esercizi corpo rigido
Un sistema termodinamico formato ...
Sempre un esame Prfo.Mussino
di 08.30
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Label: esercizi termodinamica, esercizio esame
n.20 - Due corpi sono assicurati con delle corde ...
Esame prof.Mussino
di 08.19
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Label: esercizi corpo rigido, esercizio esame
Una mole di gas ideale ...
Problema esame Prof. Mussino
di 07.51
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Label: esercizi termodinamica, esercizio esame
n.26 - una sfera di massa m ...
Esercizio esame Prof.Mussimo
di 07.27
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Label: esercizi corpo rigido, esercizio esame
n.34 - Una palla è lanciata ... Esercizio esame Prof.Mussino
di 06.57
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Label: esercizi cinematica, esercizio esame
n.5 punto di massa .... Problema d'esame del Prof. Mussino
di 06.35
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Label: esercizi dinamica, esercizio esame
n.19 - Sul doppio piano inclinato Esercizio d'esame Prof.Mussino
Nella soluzione si usa la condizione di puro rotolamento. Il filo è attaccato al centro del disco e quindi ha la stessa accelerazione del blocco. Ovviamente si trascuta l'attrito tra l'asse del disco e il perno dove è attaccato il filo.
di 06.08
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Label: esercizi corpo rigido, esercizio esame
Un gas ideale biatomico ...
di 05.56
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Label: esercizi termodinamica
Makalah Fisika, gelombang dan optik
Hai sobat fisika, seperti pada postingan sebelumnya saya telah memberikan kepada teman-teman beberapa kumpulan makalah yang saya buat dan koleksi sewaktu masa kuliah dulu, nah pada postingan kali ini saya juga akan memberikan lagi sebuah makalah dengan judul " Gelombang dan optik" silahkan teman-teman simak makalah tersebut, sebagai berikut:
BAB I
di 05.14
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Label: makalah
Il ciclo di Carnot Al link http://books.google.it/books/about/R%C3%A9flexions_sur_la_puissance_motrice_du.html?id=YcY9AAAAMAAJ&redir_esc=y il libro di Carnot dove descrve il ciclo. Alcune pagine di una versione inglese del 1897
di 01.05
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Label: termodinamica
Nicolas Léonard Sadi Carnot http://en.wikipedia.org/wiki/Nicolas_L%C3%A9onard_Sadi_Carnot
Carnot's Reflections on the Motive Power of Fire When Carnot began working on his book, steam engines had achieved widely recognized economic and industrial importance, but there had been no real scientific study of them. Newcomen had invented the first piston-operated steam engine over a century before, in 1712; some 50 years after that, James Watt made his celebrated improvements, which were responsible for greatly increasing the efficiency and practicality of steam engines. Compound engines (engines with more than one stage of expansion) had already been invented, and there was even a crude form of internal-combustion engine, with which Carnot was familiar and which he described in some detail in his book. Although there existed some intuitive understanding of the workings of engines, scientific theory for their operation was almost nonexistent. In 1824 the principle of conservation of energy was still poorly developed and controversial, and an exact formulation of the first law of thermodynamicswas still more than a decade away; the mechanical equivalence of heat would not be formulated for another two decades. The prevalent theory of heat was the caloric theory, which regarded heat as a sort of weightless and invisible fluid that flowed when out of equilibrium. Engineers in Carnot's time had tried, by means such as highly pressurized steam and the use of fluids, to improve the efficiency of engines. In these early stages of engine development, the efficiency of a typical engine — the useful work it was able to do when a given quantity of fuelwas burned — was only 3%.
The Carnot Cycle Carnot sought to answer two questions about the operation of heat engines: "Is the work available from a heat source potentially unbounded?" and "Can heat engines in principle be improved by replacing the steam with some other working fluid or gas?" He attempted to answer these in a memoir, published as a popular work in 1824 when he was only 28 years old. It was entitled Réflexions sur la Puissance Motrice du Feu ("Reflections on the Motive Power of Fire"). The book was plainly intended to cover a rather wide range of topics about heat engines in a rather popular fashion; equations were kept to a minimum and called for little more than simple algebra and arithmetic, except occasionally in the footnotes, where he indulged in a few arguments involving some calculus. He discussed the relative merits of air and steam as working fluids, the merits of various aspects of steam engine design, and even included some ideas of his own regarding possible improvements of the practical nature. The most important part of the book was devoted to an abstract presentation of an idealized engine that could be used to understand and clarify the fundamental principles that are generally applied to all heat engines, independent of their design. Perhaps the most important contribution Carnot made to thermodynamics was his abstraction of the essential features of the steam engine, as they were known in his day, into a more general and idealized heat engine. This resulted in a model thermodynamic system upon which exact calculations could be made, and avoided the complications introduced by many of the crude features of the contemporary steam engine. By idealizing the engine, he could arrive at clear and indisputable answers to his original two questions. He showed that the efficiency of this idealized engine is a function only of the two temperatures of the reservoirs between which it operates. He did not, however, give the exact form of the function, which was later shown to be (T1−T2)⁄T1, where T1 is the absolute temperature of the hotter reservoir. (Note: This equation probably came from Kelvin.) No thermal engine operating any other cycle can be more efficient, given the same operating temperatures. The Carnot cycle is the most efficient possible engine, not only because of the (trivial) absence of friction and other incidental wasteful processes; the main reason is that it assumes no conduction of heat between parts of the engine at different temperatures. Carnot knew that the conduction of heat between bodies at different temperatures is a wasteful and irreversible process, which must be eliminated if the heat engine is to achieve maximum efficiency. Regarding the second point, he also was quite certain that the maximum efficiency attainable did not depend upon the exact nature of theworking fluid. He stated this for emphasis as a general proposition: "The motive power of heat is independent of the agents employed to realize it; its quantity is fixed solely by the temperatures of the bodies between which the transfer of caloric takes place." For his "motive power of heat", we would today say "the efficiency of a reversible heat engine," and rather than "transfer of caloric" we would say "the reversible transfer of heat." He knew intuitively that his engine would have the maximum efficiency, but was unable to state what that efficiency would be. He concluded: The production of motive power is therefore due in steam engines not to actual consumption of caloric but to its transportation from a warm body to a cold body. —Carnot 1960, p. 7 and In the fall of caloric, motive power evidently increases with the difference of temperature between the warm and cold bodies, but we do not know whether it is proportional to this difference. —Carnot 1960, p. 15
The Second Law of Thermodynamics In Carnot's idealized model, the caloric heat converted into work could be recovered by reversing the motion of the cycle, a concept subsequently known as thermodynamic reversibility. Nevertheless, Carnot further postulated that some caloric is lost and not converted into mechanical work. Hence, a real heat engine could not realize the Carnot cycle's reversibility and would consequently be less efficient. Though formulated in terms of caloric, rather than entropy, this was an early rendition of the second law of thermodynamics.
Reception and later life Carnot’s book received very little attention from his contemporaries. The only reference to it within a few years after its publication was in a review in the periodical Revue Encyclopédique, which was a journal that covered a wide range of topics in literature. The impact of the work had only become apparent once it was modernized by Émile Clapeyron in 1834 and then further elaborated upon by Clausius and Kelvin, who together derived from it the concept of entropy and the second law of thermodymics.
di 00.56
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Label: Profiles
Adiabatica Cosmic Microwave Background Radiation http://www.nicadd.niu.edu/~bterzic/PHYS652/Lecture_19.pdf by Balša Terzić "The CMB radiation is a prediction of Big Bang theory. According to the Big Bang theory, the early Universe was made up of a hot plasma of photons, electrons and baryons. The photons were constantly interacting with the plasma through Thomson scattering. As the Universe expanded, adiabatic cooling caused the plasma to cool until it became favorable for electrons to combine with protons and form hydrogen atoms. This happened at around 3,000 K or when the Universe was approximately 380,000 years old (z » 1100). At this point, the photons scattered o the now neutral atoms and began to travel freely through space. This process is called recombination or decoupling (referring to electrons combining with nuclei and to the decoupling of matter and radiation respectively). The photons have continued cooling ever since; they have now reached 2.725 K and their temperature will continue to drop as long as the Universe continues expanding. Accordingly, the radiation from the sky that we measure today comes from a spherical surface, called the surface of last scattering. This represents the collection of points in space (currently around 46 billion light years from the Earth) at which the decoupling event happened long enough ago (less than 400,000 years after the Big Bang, 13.7 billion years ago) that the light from that part of space is just reaching observers."
di 00.44
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Label: Astrophysics
Sul LAVORO in termodinamica Lavoro in termodinamica In termodinamica, il lavoro viene scomposto per comodità in due contributi: un contributo relativo alla variazione di volume (lavoro di volume) e un contributo indipendente dalla variazione di volume (lavoro isocoro).
Lavoro di volume In termodinamica un gas esercita una pressione P interna sulle pareti del recipiente in cui è contenuto. Se una di queste pareti (di area A) è mobile e si sposta di una quantità infinitesima dl sotto l'azione di questa pressione, allora il lavoro infinitesimo compiuto dal gas è dato da: . dove dV = A dl è la variazione del volume corrispondente. Questo è vero se la trasformazione è reversibile, infatti solo se il sistema è in equilibrio termodinamico è possibile conoscere il valore della pressione P interna al contenitore. La notazione è usata per indicare che il lavoro in fisica non è una funzione di stato, ed invece dipende dalla particolare trasformazione eseguita sul sistema. Se il sistema termodinamico subisce una trasformazione dove non si consoce p, quindi in una tarsformazione irreversibile, il lavoro lo possiamo determinare sfruttando il primo principio della termodinamcia, conoscendo calo scambiato e variazione d'energia interna. Possiamo ancora quantificare il lavoro fatto dal gas o dal sistema comeì: , lavoro fatto contro la pressione esterna
, se ammettiamo di consocere la pressione esterna.
La termodinamica non è fatta solo di sistemi P,V,T (fluidi) e quindi ci può essere un lavoro "isocoro"
Lavoro isocoro Sotto il termine di lavoro isocoro si annoverano tutti i tipi di lavoro che non si riflettono in una variazione di volume, ad esempio: il lavoro elettrico.
Lavoro elettrico: In un circuito elettrico il lavoro infinitesimo compiuto dalla batteria che genera la differenza di potenziale E per far circolare una corrente elettrica I per un tempo infinitesimo dt è data da
, il segno di tale lavoro sarà
positivo o negativo a seconda che rispettivamente la pila eroghi o assorba corrente. Il valore del lavoro elettrico scambiato tra il tempo t 0 e il tempo t 1 si può ottenere integrando l'equazione precedente, dalla quale si ottiene:
nel caso in cui la differenza di potenziale E rimanga costante durante l'intervallo di tempo considerato, si può scrivere:
essendo: L il lavoro elettrico (in joule); E la differenza di potenziale elettrico (in volt); I l'intensità di corrente elettrica in (in ampere); t il tempo (in secondi); Qel la quantità di carica elettrica circolata durante l'intervallo di tempo considerato (in coulomb).
di 00.25
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Label: termodinamica
Kamis, 23 Mei 2013
Download Diktat Fisika Statistik
Hai sobat Fisika, pada postingan kali ini saya akan memberikan buku (ebook) diktat Fisika Statistik, berikut ini merupakan penjelasan singkat mengenai apa itu fisika statistik. Fisika statistik adalah ilmu yang mempelajari tentang sifat atau perilaku sistem yang terdiri dari banyak partikel. Generalisasi perilaku partikel merupakan ciri pokok dari pendekatan statistik. Sampai saat ini
di 05.05
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Label: download, E-Book
Rabu, 22 Mei 2013
The friction force is NOT the "force of friction on the object." Given today on a review quiz: A 0.5 kg puck sliding on a horizontal shuffleboard court is slowed to rest by a friction force of 1.2 N. (a) On the dot below, draw a free body diagram of the puck. (b) For each force, indicate the objects applying and experiencing the force. (c) Determine the amount of the normal force on the puck. I've answered part (a) in the picture. Only three of my forty students got this wrong: one forgot the friction force, two forgot the normal force. To their immense credit, not a soul put some bull honkey such as "force of motion." Also to their immense credit, not a soul misidentified the object applying the force marked "weight." Every one of the class listed weight as the "force of earth on the puck." And, everyone got the normal force right: it's the force of the shuffleboard court (or of the "surface") on the puck. So I'm proud of my class for avoiding two of the more common problems introductory students would have with this question. So why did at least a third of the class say "force of friction on the puck?" No, no, no, "friction" isn't an object! Only objects can apply forces! The correct statement is that Ff is the "force of the shuffleboard court on the puck." I expect this mistake (and many, many others) in the winter when we first cover forces and free-body diagrams. Anyone know why I managed to teach about weight and normal force successfully, but not friction? :-)
di 18.02
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Proses Terjadinya gerhana bulan dan matahari
Gerhana bulan terjadi karena sinar matahari yang menuju bulan terhalang bumi. Karena sinar matahari mengarah ke bumi, di belakang bumi terbentuklah bayangan, yaitu bayangan gelap total (umbra) dan bayangan redup (penumbra). Gerhana bulan total terjadi jika bulan berada pada daerah umbra. Jika bulan berada di daerah penumbra, gerhana yang terjadi adalah gerhana bulan sebagian atau gerhana
di 07.23
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Label: Materi
How to think about the future Nesta has just released a video (below) of the event I did in London a few weeks ago with Nate Silver and others. It's a short discussion (5 minutes from each) on prediction and forecasting, followed by 45 minutes of (good) questions from the audience. My wife's opinion is that I spoke well but radiated unnecessary waves of negativity over the audience by emphasizing the limitations of prediction and the dangers that follow from believing you can predict when in fact you cannot. Maybe so! But sometimes I do like to be cautious...
di 06.23
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Label: forecasting, future, london, nate silver, nesta, prediction
Accelerators For Baggage Scanners I've been doing my part in trying to convey the fact that the overwhelming majority of the applications for accelerators have nothing to do with particle physics. Here is another example, the use of accelerators to generate x-rays for baggage scanners.
Two SLAC physicists with decades of particle accelerator experience helped a Silicon Valley company design and build X-ray devices that scan cargo containers for nuclear materials and other hazards. A version of this screening system is now in commercial use, and on May 16, the company received national recognition for its successful development from the federal Small Business Administration.
There are a lot more examples of this that many of you come in contact with almost everyday. You use or come in contact with particle accelerators more often than you realize. Also note that this is another example where research that was meant for the study of fundamental physics, found an application elsewhere as an off-shoot. Zz.
di 06.17
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Label: Accelerator, physics application
5 universitas negeri dengan jurusan fisika terbaik Hai sobat Fisika, setelah pada potingan belakangan ini saya terus saja memberikan materi belajar, kali ini saya akan memberika sebuah infomasi yang mungkin patut teman-teman ketahui. Ada ungkapan berbunyi, “Fisika adalah Raja dari Segala Ilmu Pengetahuan”. Seluas apa jagat raya ini, seluas itulah ilmu fisika. Oleh karena itu, studi fisika tidak pernah berhenti, termasuk yang terkait dengan
di 06.02
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Label: Berita Fisika
"Ghostbusters 3" To Be Based On Physics Research? I'm trying very hard not to roll my eyes (it's getting difficult to pop them back into the sockets), but hey, if it is done tongue-incheek like the first movie, it might just be entertaining enough. It appears that the new Ghostbusters movie will tackle spacetime, or at least, something that threatened our spacetime.
Dan Akroyd told the ever-famous radio personality about the story of Ghostbusters 3: “It’s based on new research that’s being done in particle physics by the young men and women at Columbia University. Basically, there’s research being done that I can say that the world or the dimension that we live in, our four planes of existence, length, height, width and time, become threatened by some of the research that’s being done. Ghostbusters – new Ghostbusters – have to come and solve the problem.”
Oooookay! Another creation of black holes in a particle collider that could destroy our universe, perhaps? It sounds like it could be a storyline for a Marvel movie. We'll just have to see how they play this out. Zz.
di 06.01
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Label: movies
Materi Fisika, Jenis-jenis Gelombang Hai sobat fisika, melanjutkan postingan saya sebelumnya tentang gelombang yaitu materi gelombang Berjalan kali ini saya akan memberikan materi tentang jenis-jenis gelombang. Gelombang adalah getaran yang merambat, dimana yang merambat adalah energi, bukan materinya. Sebuah contoh sederhana : Jika kita berdiri di tepi pantai dan kaki kita terkena hempasan gelombang air laut, maka kita
di 05.35
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Label: Materi
Materi Fisika, Gelombang Berjalan Hai sobat Fisika, Pada postingan Sebelumnya saya telah memberikan beberapa materi, antara lain, materi Lensa, termodinamika, Efok Doppler dan Lain-lain, kali ini saya akan memberikan materi tentang gelombang berjalan, okey tanpa basabasi lagi, silahkan teman-teman simak materi tersebut sebagai berikut:
A. Persamaan
Gelombang berjalan adalah gel yang mempunyai amplitudo yang tetap /
di 05.25
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Label: Materi
Materi Fisika, Termodinamika Hai sobat Fisika, pada postingan kali ini saya akan memberikan materi tentang Temodinamika silahkan teman-teman simak materi tersebut sebagai berikut: Termodinamika adalah cabang fisika yang mempelajari tentang kalor dan usaha mekanik pada suatu system (contoh : gas) Kesetimbangan kalor terjadi jika tidak ada pertukaran kalor antara kedua benda tersebut saat bersentuhan. Kondisi ini hanya
di 05.13
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Label: Materi
Kumpulan Soal-soal fisika Hai Sobat Fisika, setelah pada postingan sebelumnya saya memberikan materi tentang Lensa Yaitu Lensa Cembung Dan Cekung kali ini saya akan Memberikan Kumpulan Soal-soal fisika yang saya kumpulkan dari berbagai sumber, silahkan klik tautan berikut untuk mengunduh soal-soal yang teman-teman inginkan:
Kumpulan soal UN materi usaha dan energi Kumpulan soal Prediksi UN Kumpulan Soal UN Materi Pegas
di 04.56
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Label: Bank Soal, download
Selasa, 21 Mei 2013
What Is Supersymmetry? Here's a video "tutorial" of what Supersymmetry is.
Zz.
di 19.38
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Label: Standard Model, Video
Materi Fisika, Lensa Cekung Lensa cekung bersifat menyebarkan sinar. Lensa cekung memiliki sifat-sifat sebagai berikut:
Sinar-sinar yang datang sejajar dengan sumbu utama akan dibiaskan oleh lensa cekung seolah-olah berasal dari titik fokus. Sinar-sinar yang menuju titik fokus dibiaskan oleh lensa cekung sejajar sumbu utama. Sinar yang melewati pusat lensa (vertex) tidak akan dibiaskan melainkan diteruskan tanpa
di 15.40
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Label: Materi
Materi Fisika, Lensa Cembung Lensa cembung bersifat mengumpulkan sinar. Lensa cembung memiliki sifat-sifat sebagai berikut : Sinar-sinar yang datang sejajar dengan sumbu utama akan dibiaskan oleh lensa cembung melewati titik fokus. Sinar-sinar yang datang dari titik fokus dibiaskan sejajar dengan sumbu utama. Sinar yang melewati pusat lensa (vertex) tidak akan dibiaskan melainkan diteruskan tanpa mengalami pembiasan.
di 15.25
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Label: Materi
Materi Fisika, Lensa Lensa adalah peralatan sangat penting dalam kehidupan manusia. Mikroskop menggunakan susunan lensa untuk melihat jasad-jasad renik yang tak terlihat oleh mata telanjang. Kamera menggunakan susunan lensa agar dapat merekam obyek dalam film. Teleskop juga memanfaatkan lensa untuk melihat bintang-bintang yang jaraknya jutaan tahun cahaya dari bumi. Kamera adalah salah peralatan optik yang
di 15.17
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Label: Materi
Materi Fisika, efek doppler Efek Doppler adalah efek di mana seorang pengamat merasakan perubahan frekuensi dari suara yang didengarnya manakala ia bergerak relatif terhadap sumber suara. Efek ini ditemukan oleh seorang ahli fisika Austria Christian Doppler pada tahun 1842. Untuk menghormati penemuan tersebut maka efek ini disebut efek Doppler.Efek Doppler yang dirasakan oleh seorang pengamat adalah tatkala ia
di 15.07
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Label: Materi
Materi Fisika, Hukum Coulomb Pada tahun 1785 Charles Augustin de Coulomb telah melakukan pengamatan secara kuantitatif terhadap gaya antar muatan listrik dengan neraca puntiran. Dari hasil percobaan tersebut ia menemukan hubungan antara gaya tarik atau gaya tolah antar dua muatan dengan besar muatan masing-masing serta jarak antar keduanya. Hukum ini terkenal dengan sebutan Hukum Coulomb yang menyatakan bahwa Besarnya
di 05.11
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Label: Materi
Materi Fisika, Muatan Listrik Listrik adalah sebuah bentuk energi. Pemahaman tentang listrik dimulai dengan pemahaman tentang muatan listrik, yaitu bagian dari atom yang disebut dengan proton dan elektron. Benda dapat dikatakan bermuatan listrik jika jumlah muatan positif ( proton ) dan muatan negatif (elektron ) tidak seimbang. Benda dikatakan bermuatan negatif jika pada benda tersebut kelebihan elektron ( jumlah
di 05.05
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Label: Materi
Induktor dalam rangkaian Arus Bolak-balik AC Sebuah Induktor / kumparan jika dihubungkan dengan sumber tegangan AC akan terlihat seperti gambar:
Selanjutnya rangkaian ini disebut dengan Rangkaian Induktif Murni. Induktor yang diberi Tegangan AC akan teraliri Arus Listrik :
Sesuai dengan Hukum Ohm Bahwa maka Tegangannya :
Rangkaian Induktif murni hanya memiliki induktansi diri L. Untuk fasor Im mendatar dengan fase . sedang
di 03.58
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Label: elektronika, Materi
Kapasitor dalam rangkaian Arus Bolak-balik AC Sebuah Kapasitor jika dihubungkan dengan sumber tegangan AC akan terlihat seperti gambar berikut:
Selanjutnya rangkaian ini disebut dengan Rangkaian Kapasitif Murni Kapasitor yang diberi Tegangan AC akan teraliri Arus Listrik :
Sesuai dengan Hukum Ohm bahwa maka Tegangannya :
Rangkaian Kapasitif murni hanya memiliki kapasitansi C. Untuk fasor Im mendatar dengan fase sedang
di 03.38
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Label: elektronika, Materi
Resistor dalam rangkaian Arus Bolak-balik AC Sebuah hambatan R jika dihubungkan pada sumber tegangan arus bolak-balik didapatkan gambar seperti berikut ini :
Resistor Yang Diberi Tegangan AC Akan Teraliri Arus Listrik :
Sesuai dengan Hukum Ohm bahwa : maka Tegangannya :
Rangkaian resistor dalam AC disebut juga Rangkaian Resistif Murni . Sebagai acuan adalah fasor arus Im dan Vm adalah mendatar karena sudut fasenya sama yaitu .
di 03.04
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Label: elektronika, Materi
Nilai efektif dan maksimum pada rangkaian Arus Bolak-balik Pernahkah anda melihat osciloskop ? Pernahkah anda mengoperasikan osciloskop? Bagaimana cara membaca grafik gelombang yang dihasilkan dari osciloskop ? Dari mana asal sumber tegangan Bolak-balik tersebut ? Apa yang terjadi dengan arus dan tegangan listrik jika komponen resistor, induktor dan kapasitor dihubungkan dengan sumber tegangan AC ? Apa yang dimaksud dengan resonansi pada
di 03.02
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Label: elektronika, Materi
Makalah kemagnetan/induksi elektromagnetik
Hai sobat Fisika, seperti pada postingan saya sebelumnya yaitu makalah dengan judul " dispersi " dan "sistem pendorong roket elektromagnetik" serta " gerak harmonis sederhana " kali ini juga saya akan posting lagi-lagi sebuah makalah... hehehe, makalah ini berjudul " kemagnetan/induksi elektromagnetik " silahkan disimak makalah tersebut sebagai
di 01.27
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Label: makalah
Senin, 20 Mei 2013
Makalah Sistem Pendorong Roket Elektromagnetik
Hai sobat Fisika, hmm.... pada postingan belakangan ini saya telah memposting beberapa kumpulan makalah, ternyata pengunjung blog ini kebanyakan carinya makalah... jadi saya lanjutkan saja membagikan beberapa kumpulan makalah koleksi saya sewaktu kuliah dulu, kali ini saya akan membagikan makalah dengan judul " sistem pondorong roket elektromagnetik" aneh ya? apa bisa teknologi
di 19.33
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Label: makalah
Makalah Dispersi
Hai sobat Fisika, pada postingan sebelumnya saya telah memberikan koleksi makalah sewaktu saya kuliah kali ini saya juga akan memberika salah satu koleksi makalah sewaktu saya kuliah dulu, judul makalah ini adalah " dispersi", silahkan temanteman simak makalah tersebut berikut ini:
BAB I
PENDAHULUAN
Interferensi adalah penggabungan secara superposisi dua gelombang atau
di 18.57
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Label: makalah
Makalah Gerak Harmonis Sederhana
Hai Sobat fisika, pada postingan kali ini saya akan memberikan salah-satu koleksi makalah sewaktu saya kuliah dulu... makalah ini berjudul " Gerak Harmonis Sederhana" silahkan teman-teman simak makalahnya , sebagai berikut.
BAB I
PENDAHULUAN
A. LATAR BELAKANG
Dalam kehidupan sehari-hari terdapat banyak benda yang bergetar.
di 18.22
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Label: makalah
Magnetism Goals Homework due 6/4, Tuesday Magnetism (Ch. 24,25) Explain the arrangements responsible for permanent magnets. Describe what affects the strength of magnetic forces and an electromagnet’s field. Describe the shape of magnetic fields around permanent magnets and charge carrying wires. Describe the causes and beneficial effects of the Earth’s magnetic field. Predict the direction of magnetic forces and induced currents. Describe how magnetic forces are applied in electric motors and generators. Determine currents and voltages produced by transformers.
di 08.36
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A "Quantum Micrsocope" To Look At The Hydrogen Wavefunction The hydrogen wavefuction is one of the few systems that we can solve analytically. That is why we teach them in undergraduate QM classes. Yet, the ability to actually view such wavefunction isn't trivial and is part of the fundamental aspect of QM. This latest work looks at the nodal structure of a hydrogen atomic orbitals using photoionization. In the process, the authors have provided a significant step in developing a "quantum microscope".
Writing in Physical Review Letters, Aneta Stodolna, of the FOM Institute for Atomic and Molecular Physics (AMOLF) in the Netherlands, and her colleagues demonstrate how photoionization microscopy directly maps out the nodal structure of an electronic orbital of a hydrogen atom placed in a dc electric field. This experiment—initially proposed more than 30 years ago—provides a unique look at one of the few atomic systems that has an analytical solution to the Schrödinger equation. To visualize the orbital structure directly, the researchers utilized an electrostatic lens that magnifies the outgoing electron wave without disrupting its quantum coherence. The authors show that the measured interference pattern matches the nodal features of the hydrogen wave function, which can be calculated analytically. The demonstration establishes the microscopy technique as a quantum probe and provides a benchmark for more complex systems.
The link above provides free access to the paper. Zz.
di 08.04
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Label: Experiment, Quantum mechanics
A Physicist Having A Yard Sale? You'd think that we physicists are immune to having a yard sale. That's the look that I got over the weekend when some people found out that I was a physicist. Over this past weekend, I decided that I've had enough crap.... er ... stuff in the house that needs to go. So I decided to do a garage/yard sale, since that was the weekend that my city designated as our zipcode-wide garage sale days. I set up stuff very early on Friday, and it went through till mid afternoon yesterday. So it is your typical yard sale in many ways - old stuff, used stuff, but also a few new stuff that never been opened. But I guess what made it rather unusual are all the science/math books that I had for sale. Some people who walked by the stacks of books did a double take when they see books on math, physics, spectroscopy, etc. A person even picked up the infamous Abromowitz and Stegun's "Handbook of Mathematical Functions", looked at me, and said "Really?!" And I replied "Really!". A few people inquired what I do for a living, and of course, many of them have never met a physicist (at least, not that they know of). A person even asked if I work at CERN! :) Anyway, the 3-day yard sale weekend was tiring, but it was a lot of fun. Made more than $300 selling stuff that I no longer want. Whatever's left will be donated. And no, the Abromowitz/Stegun book didn't get sold, as with the rest of the math/science books, even though I was selling them for 50 cents a piece! If you are in the Chicago area, look out for those on sale at your nearest charity resell stores in the near future! Zz.
di 07.38
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Label: Offbeat, Physics people
Minggu, 19 Mei 2013
Materi Belajar Fisika, Perpindahan Kalor
Hai sobat fisika, kali ini saya akan memberika materi belajar perpindahan kalor, setelah sebelumnya saya telah memberikan materi tentang medan magnet dan kapasitor, pada materi belajar ini bersifat Pembelajaran Mandiri (Tutorial). Berisi tentang konsep dan penerapan konsep perpindahan kalor, dilengkapi contoh soal dan latihan.
di 14.40
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Label: Materi, SMA
Materi Fisika : Medan Magnet Medan Magnet di Sekitar Kawat Lurus Besarnya medan Magnet disekitar kawat lurus panjang berarus listrik. Dipengaruhi oleh besarnya kuat arus listrik dan jarak titik tinjauan terhadap kawat. Semakin besar kuat arus semakin besar kuat medan magnetnya, semakin jauh jaraknya terhadap kawat semakin kecil kuat medan magnetnya.
Berdasarkan perumusan matematik oleh Biot-Savart maka besarnya
di 13.50
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Label: Materi, SMA
Materi Fisika: Kapasitor Pengertian KapasitorSeberapa seringkah kalian men-charge handphone..? atau pernahkah kalian melihat lampu flash dari kamera..? Baterai handphone, lampu flash kamera adalah contoh penggunaan kapasitor dari kehidupan sehari-hari. Alat-alat elektronik yang ada seperti TV, komputer, Laptop menggunakan kapasitor sebagai komponen penyusunnya.
Pengertian Kapasitor
Kapasitor adalah
di 13.32
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Label: elektronika, Materi
Materi Fisika : Momentum Linier IMPULS Seseorang menendang bola yang bermassa m dengan gaya F selama selang waktu Δt dapat menyebabkan perubahan kecepatan pada bola tersebut yang besarnya v1 menjadi v2 dari hukum II Newton : F = m.a, dimana a = (v2 - v1) / ΔtF = m. (v2 - v1) / ΔtF. Δt = m. (v2 - v1) F = besar gaya yang bekerja (N)Δt = selang waktu gaya (s)v1 = kecepatan awal (ms-1)v2 = kecepatan akhir (ms-1)
di 13.01
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Label: Materi
Sabtu, 18 Mei 2013
materi Belajar fisika, Usaha, Energi Dan Daya Hai sobat fisika, jumpa lagi, setelah pada postingan sebelumnya saya membagikan materi belajar tentang pengaruh kalor terhadap suatu zat, maka kali ini saya menshare materi belajar tentang usaha, energi dan daya, materi belajar ini bersifat tutorial (mandiri), membahas tentang usaha dan energi. materi belajar ini dilengkapi dengan soal uji kompetensi.
di 09.40
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Label: Materi
Materi belajar fisika, pengaruh kalor terhadap suatu zat hai sobat fisika, ketemu lagi, setelah kemarin saya telah membagika materi belajar tentang elastisitas dan kumpulan soal-soal fisika untuk SMP, kali ini saya akan menshare materi belajar tentang pengaruh kalor terhdap suatu zat, materi belajar ini bersifat mandiri (tutorial), membahas tentang Menganalisis perpindahan kalor yang terdiri dari Konduksi, Konveksi dan radiasi dilengkapi dengan
di 09.25
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Label: Materi
Bahan Belajar Alat Ukur listrik Hai sobat fisika,setelah kemarin saya membagikan materi belajar tentang gaya gravitasi newton kali ini saya akan share bahan belajar alat ukur listrik. Bahan belajar ini bersifat tutorial (mandiri), membahas tentang Alat Ukur Listrik, dilengkapi dengan soal dan pembahasan. Bahan belajar ini diakhiri dengan uji kompetensi.
Standar
di 09.12
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Label: Materi
The spinning top
di 04.44
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Label: trottola
Rotate vs revolve Rotate versus revolve, from http://www.worldwidewords.org/nl/uifj.htm by MICHAEL QUINION Q From Brian Miller, Australia: A loosely organised group of eccentric friends and wine lovers meets each week. The question arose, does a lazy Susan revolve or rotate? What about the plates on it? A That’s an interesting question, which lacks a simple answer. If anybody’s not sure about a lazy Susan, by the way, it’s a device on a table which turns to give easy access to plates and condiments. ... The two words are used so interchangeably in the sense of spinning round that for most purposes they’re synonyms and they’re treated as such in thesauruses. To take an example, does a wheel rotate or revolve? Most people would say it can do either. If you’re arguing from etymology (always risky), it can only rotate, since that term is from the Latin verb rotare, to turn in a circle, whose root is rota, a wheel. But you might argue that it revolves, because that verb is from the Latin volvere, to roll (in this case, the re- prefix implies repetition of the action) and a wheeled vehicle certainly does roll along. Strictly speaking, there is a difference, which is most noticeable in the terminology of astronomers. For them, the earth rotates every 24 hours but takes a year to revolve around the sun. The rule about which verb to use is based on the position of the axis of rotation. If the body turns on an axis within itself it rotates but if the axis is outside it revolves. Following this definition, a wheel can only rotate (hooray for etymology). The strict answer to the question, therefore, is that the lazy Susan rotates. However, because the plates on it orbit or circle around an axis outside themselves, they revolve. Do not insist on this careful distinction during the later stages of a dinner party or the lazy Susan may become a spinning projectile aimed at you. As I say, the rule is rarely observed outside science and the two words have been hopelessly muddled for centuries. A revolving door actually rotates; a rotating shaft makes revolutions. You might argue that a revolver ought to be a rotator but it depends whether you are thinking of the cartridges or the cylinder that holds them.
di 03.39
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Label: In Inglese
Jumat, 17 Mei 2013
Electricity Review Key The answers for the two power calculations for the fist circuit in question 2 are wrong. The calculations are set up correctly though.
Current Electricity Review Key
di 15.53
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Having trouble counting spin states There is something funny about the fact that spin is supposedly "quantized" along the z axis. The thing is that it only really "works" because of a funny geometrical property of spheres. Let's say you have a spherical apple and you cut it into 1/4-inch slices. Everyone knows that you get a different amount of apple in each slice, but the funny thing is...you get the same amount of peel. What this says in quantum mechanics is that if you have a spin-11 system whose z-axis spin is randomly distributed among all values between plus and minus eleven, then those random spins are equally distributed among all spherical directions. It's a property of spheres that is intimately related to the fact that the surface area of a sphere is exactly four times the crosssectional area. I started trying to write about this...oh, maybe two months ago. I finally cobbled something together and posted it but I swept something under the rug that is very embarassing. It turns out I don't know how to count spin states. I thought I did, but I didn't. I'm going to try and explain the problem. If you have one electron, there are two spin states. People say the spin must be either up or down, but that's nonsense. The spin can be in any direction, but those directions are expressible as the superposition of an "up" state and a "down" state. The total spin is one-half. If you have two electrons, there are now four spin states. Both up, both down, and one-up/one-down. Wait...that's only three spin states. Not exactly...it turns out that depending on the relative phase of the up-down combination, they can form a spin-zero state. They don't have to...they can form a spin-one state in a superposition of left- and right-spin. That's not spin-zero. There is a unique spin-zero state that has no spin anywhere, called the "singlet state". I've written about it here. So for two electrons, you can describe the total spin by giving the complex amplitudes for the up- and down- spings of both electrons...that's four "basis" states. Or you can be more "elegant", as they say, and describe the total spin as the three amplitudes for the triplet states...that is, (+1, 0, or -1) along the z-axis, plus the amplitude for the singlet states. Either way, it's four basis states. With three electrons, it's the same. You have now six amplitudes to describe the individual electrons. Or, you can group them in states...they can form either a spin-3/2 state with four z-axis levels, or a spin-1/2 state with two z-axis levels. Six states. With four electrons...now bear with me...it's the same.; You now have eight amplitudes to describe the individual electrons. Or, you can group them into spin-2 states (five z-axis levels), spin-1 states (3 z-axis levels), and a spin-zero state. Eight states. No...wait. There are nine states if you group them into total-spin states, and only eight if you just list the individual electron states. And it gets worse. For five electrons, you have ten numbers to describe the individual spins. Or you can group them by total spin: spin-5/2 (six states), spin-3/2 (four states), and spin-1/2 (two states). I don't think you can have more spin states than you get by listing the states of each individual electron. But at the same time, I don't see why there is any redundancy in describing a box of 21 electrons as having such-and-such amplitude to be l=11, m=6, such-and-such amplitude to be l=9, m=7, plus whatever. Because it works perfectly for a two-electron system. You have suchand-such amplitude to be in each of the triplet states, plus an amplitude to be in the singlet state. Why does this system break down when we add the fourth electron? So there it is. I don't know how to count spin states. But at least I know that I don't know how to count them. That counts for something, doesn't it?
di 15.47
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