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Usenet Physics FAQ function donsAdrs() { var a = "ysics"+"."+"adela"; var b = "oks"+"@"+"ph"+a; var c = "ilto"+":"+"dk"+b+"ide.ed"; var d = "ma"+c+"u.au"; var e = "Don Koks"; return e; }Version Date: September 2009

Usenet Physics FAQ

Sir Isaac Newton magnet particle tracksThis is the web version of the Usenet Physics FAQ (Frequently Asked Questions). Its purpose is to provide good answers to questions that have been discussed often insci.physics and related usenet newsgroups.  The articles in this FAQ are based onthose discussions and on information from good reference sources.  That does not meanthat they are always perfect and complete.  If you have corrections, updates oradditional points to make please send an email to the editor, document.write(donsAdrs()) (his cv is here).  If you want to write up an article following anews group discussion about a subject not yet covered here then feel free to send it tothe editor, but please do not use this address to ask new questions.  Ask them in theappropriate newsgroup instead.If you are new to the Physics newsgroups, welcome!  Please read thearticle An Introduction to the PhysicsNewsgroups.  It will help you find the right newsgroup for your questions andwill give you other crucial advice about appropriate netiquette for these groups. Above all you should check carefully to see if your questions are answered in this FAQbefore posting.This FAQ was created by Scott Chase in 1992.  The web version was created,maintained and enlarged by Michael Weiss and Philip Gibbs.  Others who have writtenfor the FAQ are credited at the top of the items they submitted while many more who havemade smaller contributions have been thanked privately.The FAQ is not available in text-only form and is no longer posted to the usenetgroups.  This is because it is too big and some articles use images and equationswhich cannot be transformed into text.This document is copyright.  Please read the copyright notice for copyright details andarchival information. Albert Einstein E=mcsup2/sup Spiral Galaxy M100

Index of Subjects

General Physics

What is Occam's Razor? Hot water freezes faster than cold! Why are golf balls dimpled? What is a dippy bird, and how is it used? Why do mirrors reverse left and right? Which way will my bathtub drain? How does a light-mill work? Why do stars twinkle while planets do not? Is glass solid or liquid? I know a place where things can roll uphill! What do you call rate of change of acceleration? Is magnetic levitation possible? Why is the sky blue? Open questions in physics Does centrifugal force hold the Moon up?

Particle and Nuclear Physics

Below absolute zero - what doesnegative temperature mean? How to change nuclear decay rates Have physical constants changed with time? Do tachyons exist? The particle zoo Does antimatter fall up or down? Baryogenesis: why are there moreprotons than antiprotons? The solar neutrino problem What is the mass of a photon? Why are there eight gluons? What are half lives and meanlives?

Quantum Physics

The EPR Paradox and Bell's Inequality Some frequently asked questions aboutvirtual particles What is the Casimir Effect? Can the human eye detect a single photon?

Relativity and Cosmology

Speed of Light Why is c the symbol for the speedof light? Is the speed of light constant? How is the speed of light measured? Why is the speed of light so high? Is there an equivalent of the sonicboom for light? Is it possible to go faster than light? I am going at the speed of lightand I turn on my headlights. . .? Apparent superluminal velocityof galaxiesSpecial Relativity What is the experimental basis of specialrelativity? How do you add velocities in special relativity? Can special relativity handle acceleration? Does a clock's acceleration affect its timing rate? Do moving clocks always run slow? What are the equations for a relativistic rocket? The barn and the pole The rigid rotating disk in relativity The Twin Paradox Bell's Spaceship Paradox The superluminal scissors Can you see the Lorentz-Fitzgerald Contraction? Relativity in chemistry: the color of gold What is relativistic mass? What would a relativisticinterstellar traveller see?General Relativity and Cosmology What causes gravity? Is pi constant in relativity? What is gravitational radiation? Does gravity travel at the speed of light? Is energy conserved in General Relativity? Olbers' Paradox What is dark matter? Do atoms get bigger as the universeexpands? What causes the Hubble redshift? Where is the centre of the universe? Mercury's orbital precession Time travel: fact or fiction? Is the cosmological constant nonzero?Black Holes What is a black hole, really? How does the gravity get out ofthe black hole? What happens to you if you fall into ablack hole? If you go too fast, do you become ablack hole? What is Hawking Radiation? The black hole information loss problem Is the Big Bang a black hole?

Reference Topics

An introduction to the physics newsgroups The care and feeding of kill files Accessing and using on-line physics resources Useful physics resources on the Web Notation and abbreviations used in the FAQ andnewsgroups A physics booklist The Nobel Prize for physics Possible topics for discussion onsci.physics.relativity A guide to relativity books

Related FAQs

There are many other places where you may find answers to your question.  This is alist of other FAQs and answer archives that are related to physics. sci.astro FAQ Space FAQ David Stern's Science Overviews (astronomy) Scientific American'sAsk The Experts (Astronomy) Sten Odenwald's Ask theSpace Scientist StarStrider John Simonetti's Astronomy and Physics FAQ Cornell University's Ask an Astronomer Scientific American's AskThe Experts (Physics) Jason Hinson's Relativity and FTL Travel FAQ Chris Hillman's Relativity onthe WWW Wayne Throop's Relativity Ted Bunn's Black Holes FAQ Ned Wright's Cosmology FAQ Douglas Scott's CosmicMicrowave Background FAQ Arnold Neumaier'sTheoretical Physics FAQ Measurement in quantum mechanics FAQ Conventional Fusion FAQ sci.chem FAQ rec.puzzles FAQ(physics) Urban Legends FAQ (science) New Scientist's Last Word

Mirror sites

This FAQ is currently available from these web sites: Australia: http://hermes.physics.adelaide.edu.au/~dkoks/Faq Canada: http://www.stillmoving.ca/physics/faq England: http://physicsfaq.co.uk/Faq Germany: http://www.desy.de/pub/www/projects/Physics Netherlands: http://www.xs4all.nl/~johanw/PhysFAQ Taiwan: http://www.phys.ncku.edu.tw/mirrors/physicsfaq USA: http://math.ucr.edu/home/baez/physics http://scope.joemirando.net/faqs http://www.obscure.org/physics-faq http://www.edu-observatory.org/physics-faq http://www.ronen.net/physicsThanks go to John Baez, Ronen Ben-Hai, Jay Brown, Jon Butterworth, Alan Cairns, DaveEdsall, Harald Falkenberg, Philip Gibbs, Amarendra Godbole, Chris Hillman, Chung-rui Kao,Matt McIrvin, Joe Mirando, Matthew Parry, Han-Tzong Su, Nathan Urban, Johan Wevers, SamWormley, and the various organisations for hosting us!  If any other non-commercialsites would like to mirror this FAQ, please contact the editor.
 

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