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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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Common Relativity questions, quality answers
Jul24-14 09:06 AM Greg Bernhardt 
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Jan16-12 Greg Bernhardt
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 Ö 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
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
Dear all, I have a simple question. Consider a long railway station. Say 2 kmís 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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