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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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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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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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I was just reading the sci.physics.faq on the...
Feb25-14 02:46 PM
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Hi all, I tried searching for this but failed to find an answer to my question. I am having an issue with properly...
Feb25-14 01:01 PM
12 431
Howdy, This is my first post. Please be gentle. ;-) I have been thinking about the speed of light. Scenario...
Feb25-14 09:19 AM
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Sorry I'm new to this. There are apparently four forces in the universe: Gravity, EM, Weak and Strong. Is gravity...
Feb24-14 04:19 PM
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hi guys i have question can any body answer please. why the light fell in to the black hole whether it have no mass.
Feb24-14 02:43 AM
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Could spacetime itself be a field?
Feb24-14 12:01 AM
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i have asked my physics and maths teacher a question which they could not answer, the question follows:- Does the...
Feb23-14 06:30 PM
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I'm working through A. Zee's new EGR book, and I came to a step on tidal forces I couldn't follow. He presents the...
Feb23-14 10:33 AM
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Is there an absolute sequence of events in the universe- independent of observation? It seems like so much emphasis is...
Feb23-14 03:08 AM
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In the spirit of this forum I should first announce: -generally, I have no idea what I'm talking about but look for...
Feb23-14 12:29 AM
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In Special Relativity the example is given of a pole that alternates color, as seen in its own rest frame. Someone in...
Feb22-14 09:56 PM
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Before I get down to business, I would like to note (you don't have to read this; feel free to skip to where it says...
Feb22-14 06:31 PM
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Is it true that the speed of light is a conversion factor between time and space? and that D = C*T? and if it...
Feb22-14 05:51 PM
8 505
When we way that \frac{d^3p}{p_0}=\frac{d^3p}{\sqrt{m^2+\vec{p}^2}} is the invariant volume element, is that...
Feb21-14 10:36 PM
2 293
I am currently studying special relativity on my own and I am looking into space time and space time diagrams. While...
Feb21-14 07:31 PM
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In another thread we determined that the proper total force acting on an orbiting object in the Schwarzschild metric,...
Feb21-14 09:11 AM
5 352
Dumb question....but thought I'd throw it out there. So, ever since I was a little kid of 6 or so, I loved to look...
Feb21-14 08:55 AM
13 468
This is a very basic question, but I cannot get my head around the following: Any physical system should be invariant...
Feb20-14 02:22 PM
34 969
Let's imagine a rocket orbiting the earth. The rocket could be any real rocket with moderate speed, so that...
Feb19-14 07:51 PM
11 564
I was reading some posts on one of my previous threads (great discussion there btw) and I red something that I really...
Feb19-14 06:20 PM
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I've been watching the Stanford lectures on GR by Leonard Susskind and according to him the metric tensor is not...
Feb19-14 02:08 PM
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I have been wondering what to expect if there was a hole, from pole to pole, that inside which we could measure the...
Feb19-14 12:16 PM
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When I studied special relativity for the first time, I encountered the exemple of a infinite neutral wire in the...
Feb18-14 09:18 PM
8 596
On page 161 of Carroll's Spacetime and Geometry, Carroll writes that \delta...
Feb18-14 03:32 PM
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We all know that the energy-momentum tensor for dust is just ##T^{\alpha\beta}=\rho_0 v^\alpha v^\beta##, where...
Feb18-14 02:57 PM
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I am currently taking an undergraduate modern physics course that offers a brief overview of relativity. Let us...
Feb18-14 07:49 AM
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It is said that Relativity proves that if one travels near the speed of light that time slows down, i.e. that the twin...
Feb18-14 05:38 AM
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Let's say there's a wormhole entrance on the floor of my room, and the exit would be on the ceiling. If I drop a ball...
Feb17-14 11:17 PM
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If light approaches a black hole will it accelerate? I think this question ties in with whether light has mass or not....
Feb17-14 10:30 PM
10 457
Hello, It is my understanding that in the case of two observers (A and B) passing each other at high speeds that due...
Feb17-14 03:11 AM
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I'm trying to understand the special theory of relativity. All answers I've found to the problem below seem to provide...
Feb17-14 02:45 AM
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Would someone be kind enough to tell me if I'm getting this correct. ...
Feb16-14 02:41 PM
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I'm trying to find examples of stress-energy tensors from exact solutions of the EFE corresponding physically to...
Feb16-14 06:30 AM
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Why do we always need to define simultaneity in relativity. The moving train with a light signal at the mid point...
Feb16-14 04:15 AM
6 461
The "s" in the geodesic equation refers to the "surface area" for that portion of the orbit around a star or black...
Feb15-14 07:53 PM
3 320
In classical mechanics you want to calculate the moment of inertia for hollow & solid: lines, triangles,...
Feb14-14 06:04 PM
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Hello fellow PF go-ers I am having trouble with coordinates in curved space time lately, allow me to demonstrate my...
Feb14-14 12:55 PM
5 360
I am starting to learn Special and General realitivity by reading through Bernard F. Schutz's book "A First Course in...
Feb13-14 05:40 PM
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After a recent conversation, I was trying to determine if there is an online authoritative definition for the age of...
Feb13-14 05:06 PM
13 468
It is said that the light we see from a star a million light years away is actually what happened a million years ago,...
Feb13-14 10:55 AM
6 1,074

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