# Special & General Relativity

- Dependence of various physical phenomena on relative motion of the observer and the observed objects. Exp. & theo. theories of relativity
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### Relativity FAQ

Common Relativity questions, quality answers
Jul24-14 09:06 AM Greg Bernhardt
 Meta Thread / Thread Starter Last Post Replies Views Views: 114,590 Announcement: Follow us on social media and spread the word about PF! Jan16-12 Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a... Feb23-13 08:40 AM ZapperZ 1 41,496 The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many... Dec31-07 02:06 AM jtbell 0 41,122 I've read that the GPS system has to take into account the Sagnac effect when sending signals from the satellites to... May3-08 07:53 PM Stoonroon 15 7,141 hello people of physics, i am a 14 year old boy from Greece and i am generaly attracted to... May3-08 07:07 PM jtbell 3 1,093 Measuring the relativistic mass and energy When we speak about a physical quantity we should define it and it... May3-08 07:03 PM jtbell 7 2,116 In the view of PF posters, what is the "current" theory explaining the Sagnac effect? I have heard of something... May3-08 06:51 PM Stoonroon 2 3,934 Does gravity function as a lens, a prism or both? May3-08 02:23 PM jtbell 1 1,390 I understand photons have no rest mass, but I also learned in my physics class p=h/(lambda), and that mass depends on... May2-08 08:20 PM fireball3004 7 1,522 A spherical ball rolls without slipping along a surface, with uniform velocity v/c (close to 1) with respect to the... May2-08 07:06 AM yuiop 125 17,238 Does gravity function as a lens, a prism or both? May1-08 03:34 PM lzkelley 2 1,848 Subject Experiments are simply explained by Aether attached to Earth. And you get a clean definition of time from... May1-08 02:22 PM jtbell 2 1,229 As a photon travels at the speed of light, it does not experience time. For a photon the beginning and end of time are... May1-08 01:45 PM Usaf Moji 15 2,639 I know this has been asked before but I would like to float a related question. Why does the second postulate... May1-08 12:00 PM DrGreg 13 1,854 What rules out Aether being attached to earth? Why should the earth be singled out as stationary wrt the aether?... May1-08 10:27 AM shoehorn 3 1,071 I understand what geodesics are and how to calculate them from Christoffel symbols and all that. But I've just come... May1-08 09:09 AM George Jones 5 2,053 What is the rationale for the sign convention in the space-time 4-vector? How is it related to the sign convention in... May1-08 08:51 AM pmb_phy 9 2,080 Why do most explanations of the Twins Paradox claim that the twin on the space ship ages less because he is the one... May1-08 04:51 AM Phy6explorer 4 1,708 I'm putting this here since I'm a high school student who has only completed two years (pre-AP and AP) of introductory... Apr30-08 07:30 PM pmb_phy 14 1,779 How is a photon's energy determine in relation to it's wavelength and frequency? For example, 20hz vs. 400ghz... Apr30-08 07:16 PM pmb_phy 4 16,636 I have scanned the simultaneity related posts and cannot find a succinct answer to a question I have - I accept that... Apr30-08 02:05 AM neopolitan 280 33,565 Apparently some crackpot blew some  on a full page ad in a science magazine, claiming to show that there black holes... Apr29-08 08:54 PM cristo 1 902 I quite often hear that GR is formulated in terms of tensors because laws of physics expressed in terms of tensor... Apr29-08 03:17 AM jdstokes 21 3,206 And the 2nd question: Do we know why is the speed of light 3*10^8 m/s? What determines this value? (I'm not asking... Apr29-08 02:18 AM neopolitan 50 15,040 Hi. I am learning special relativity and have decided to take Einstein's train example to practice some... Apr28-08 09:32 PM morrobay 7 4,482 Assume 2 massive bodies are moving away from each other at high speed. Since the gravitons which cannot travel at... Apr28-08 03:22 PM lzkelley 8 3,235 (the story so far … I maintain that, inside an event horizon, there is a useful distinction between "space" and... Apr28-08 06:42 AM DrGreg 34 10,106 Question: 1. A gravitational interaction causes two energy densities to accelerate towards each other. 2. This... Apr28-08 02:54 AM redtree 19 2,348 I understand if this question sounds juvenile, because I thought of it after seeing a science fiction movie called... Apr28-08 01:35 AM JesseM 2 1,336 Lorentz transformation shows that at the speed of light you divide by zero. Photons travel at the speed of light,... Apr27-08 04:42 PM lzkelley 1 1,806 http://psi.phys.wits.ac.za/teaching/Connell/phys284/2005/lecture-01/lecture_01/node13.html But what about induced... Apr27-08 04:17 PM Dropout 3 2,027 Does it make sense for the Ricci Scalar to be a function of the spacetime coordinates? In previous calculations I... Apr27-08 11:46 AM lbrits 3 2,910 Gamma in GR ( 1 2) Does the Lorentz factor show up much (or at all) in general relativity? For instance, is it appropriate to use it as... Apr27-08 11:23 AM shalayka 34 3,958 Hawking gave the black hole entopy equation: (1) S_{BH} = {k c^3 \over 4G \hbar} A where A is the surface area... Apr27-08 10:27 AM Aether 2 1,937 What is the significance of solutions to non-homogeneous wave equations for the scalar and vector potentials that... Apr26-08 11:53 PM Stingray 13 3,609 Blind man's Relativity ( 1 2 3 ... Last) Dear all, I have a simple question. Consider a long railway station. Say 2 km’s long. Station master put two... Apr26-08 11:21 PM newTonn 108 12,592 I have two cathode ray tubes which generate the same amount of beam, i.e., one tube fires off x electrons per second... Apr26-08 08:42 PM HarryWertM 9 2,316 I just want to verify that I have the right mindset here on the subject: p=mv You can increase the momentum as... Apr26-08 04:43 PM pmb_phy 5 1,701 The axis of a spinning gyroscope is observed to be parallel to the x,y plane and at 45 degrees to both the x and y... Apr26-08 02:05 PM Mentz114 11 2,717 Suppose you have a very strong, spinning disc with a diameter of say 10 km in length. At the centre the centripetal... Apr26-08 01:07 PM yoyoq 15 4,368 According to GR, how do changes in the mass of an energy density become reflected in its gravitational field? Is... Apr26-08 12:37 PM Haelfix 9 2,182 Wheel experiment: A balanced wheel has two large masses attached to the rim opposite each other with respect to the... Apr26-08 11:48 AM Wizardsblade 9 1,830 Ok so I'm sitting at 0040 in the AM pondering this...is Time Dilation a constant. For example. It only takes an Object... Apr26-08 06:22 AM Tweek 0 2,600

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