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Common Relativity questions, quality answers
Mar11-14 10:20 AM bcrowell 

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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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The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...
Dec31-07 02:06 AM
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Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
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Does any one know if Einstein equation predicts the existence of particle jets fired by massive black holes observed...
Mar23-12 11:38 AM
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Please help me I want special relativity practice problems. Im a second year.
Mar23-12 02:26 PM
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hi, value of c is experimental however c itself is theoretically lorentz invariant. So value of c depends upon...
Mar24-12 12:01 PM
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Lorents and Einstein both made equations to describe time dialation. One of these equations was used in quantum...
Mar24-12 06:25 PM
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So my physics teacher has been trying to explain magnetic forces in terms of electric forces and relativity but I'm...
Mar25-12 09:40 AM
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I read about Einstein's hole argument and about diffeomorphism. Pasive diffeomorphism is changing of coordinate...
Mar25-12 01:02 PM
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Hi Physics Forumites I have tried to find a post which I didn't bookmark - foolish me. It discussed uniform...
Mar25-12 02:10 PM
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1) How can get work done on a photon because work done = kinetic energy it depends on mass, but the rest mass of a...
Mar26-12 08:29 AM
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I know that magnetic force due to a current carrying wire on a test charge moving w.r.t the wire(along the wire), can...
Mar26-12 05:20 PM
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Hi all I am new to relativity, and through the books that I have chosen to learn the subject (that cater to my...
Mar26-12 08:18 PM
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Hi all. I keep coming across the term "quadratic gravity" in various GR papers and don't entirely understand the...
Mar27-12 06:23 AM
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Blame it on Woodstock. Can I ask a stupid question? Actually two of them? First off, I'm not a physicists. I write...
Mar27-12 04:57 PM
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How accurate are the muon velocity measurements in storage rings, for muons generated in hadron colliders like CERN....
Mar27-12 09:18 PM
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In SR the points in Minkowski space correspond to events. I recently read in a GR lecture note that the points on the...
Mar27-12 10:54 PM
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I have a dufficult question which I couldn't find an answer to, yet: If I am standing in front of a mirror - I can...
Mar28-12 03:51 AM
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Hi, a while back i had ran into the equation for dynamic mass and had immedietly taken an interest in it in that it...
Mar28-12 05:43 AM
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What would happen to the spacetime fabric when two super massive blackholes collide. I know that they would orbit each...
Mar28-12 07:07 AM
Vanadium 50
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I have no idea about it, as my understanding,that Mr.Einstein depicted that what actually happening in space are...
Mar28-12 07:14 AM
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This link is confusing me. In this link, with...
Mar28-12 10:07 AM
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I don't want to beat a dead horse with anyone fixed on dogma, but I do understand the theory of relativity and the...
Mar28-12 03:48 PM
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Two individuals A and B are traveling through space at a velocity in the "x" direction at and are next to each other...
Mar28-12 04:56 PM
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Ok, I want to make sure I understand this correctly. Let's say I'm moving at 90% c and pass a light bulb that is at...
Mar28-12 06:24 PM
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I searched this site and could not find any referances for what a good lightspeed ship would look like. Does anyone...
Mar28-12 09:41 PM
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In classical physics, the force on an object experiencing constant acceleration is equivalent to the "gravitational...
Mar29-12 11:49 AM
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Hi all, It doesn't seem that a relativistic ship travelling in deep space would need much shielding due to...
Mar29-12 03:24 PM
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How can we calculate force of gravity between two objects using Einstein's relativity theory. Using Newton's method we...
Mar29-12 06:14 PM
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Hello I need help with a problem: If I see two identical charges moving in the same direction parallel to each other...
Mar29-12 09:11 PM
Bob S
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Is it possible to formulate a dynamical theory of spacetime geometry that isn't invariant under active...
Mar30-12 01:28 AM
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Can you explain Einstein's train metaphor/thought experiment. Thanks
Mar30-12 06:15 AM
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So the confusion I'm having here really has to do with parity inversion in spherical (or boyer-linquist) coordinates. ...
Mar30-12 12:28 PM
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Hello all, Having read many threads and posts about light, itís speed c, SR etc, the particular issue of not...
Mar30-12 03:29 PM
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Hi all One things that puzzles me is the speed of light. We measure it always the same speed independently if we...
Mar30-12 04:57 PM
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these should be some very easily answered questions. how does anyone know photons exist? im guessing they can be...
Mar31-12 12:51 AM
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For the following two-dimensional metric ds^2 = a^2(d\theta^2 + \sin^2{\theta}d\phi^2) using the Euler-Lagrange...
Mar31-12 04:57 AM
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Hi, I'm not sure if this is the right sub-forum because i know very little about this kind of stuff :/ But something...
Mar31-12 09:07 AM
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I am trying to understand FRW universe. To do so I am following the link below: ...
Mar31-12 03:21 PM
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Where can I find the exact form of variation of Chern-Pontryagin invariant for four-dimensional space (free on the...
Apr1-12 03:29 AM
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hy guys,so Einstein jad a quote "everything is relative" but he proved that lightspeed has speed c relative to any...
Apr2-12 04:12 AM
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Hi, Now we have the "faster than speed of light" neutrinos, I was wondering the next philosophical question: If...
Apr2-12 09:37 AM
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Sometimes I get frustrated with the dialogs in this forum because there are so many misunderstandings and outright...
Apr3-12 01:45 AM
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