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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
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 40,667
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
ZapperZ
1 41,008
http://www.arxiv.org/abs/quant-ph/0311049 "Black Holes and Information Theory" popularly written, at least for...
Nov17-03 03:57 PM
nonunitary
7 1,999
To anyone smarter than myself(which should be a lot of people here): It's clear that relativity neccessitates that...
Nov20-03 09:25 AM
Ambitwistor
7 1,629
http://www.lns.cornell.edu/spr/2003-10/msg0055587.html I think its a stroke of good luck that the SSC was cancelled...
Nov21-03 08:49 AM
wolram
26 3,001
I am pretty new to physics in general. From what i've gotten so far, relativity states that time increases (or the...
Nov21-03 05:43 PM
Phobos
2 1,234
How I understand how scientists determined if there was ether or not was through a test. This test was to send light...
Nov25-03 10:36 AM
Eepl
6 3,696
here is a good paper that may be of interest:http://uk.arxiv.org/abs/gr-qc/0311082
Nov26-03 01:34 PM
ranyart
0 2,335
This is a pretty basic concept of relativity that used to make sense to me but I have since become a little unclear on...
Nov27-03 07:30 PM
Hurkyl
3 1,192
Do photons effectivley travel instantaneously? If not then the question posed by Einstein "If I travel at the speed of...
Nov28-03 10:30 AM
Pyrokenesis
3 1,015
according to these theories; I belive every following day a day is becomming shorter. but we dont feel it.
Nov28-03 07:05 PM
Nereid
2 1,388
i have come across a reference to an experiment pertaining to gravity, it is called the WEAX experiment, the only...
Dec1-03 04:53 PM
wolram
2 1,037
:- It that Real??? http://www.superstringtheory.com/forum/socboard/messages6/99.html
Dec3-03 03:29 PM
LURCH
11 1,957
I have had this question nagging at me and making me lose sleep for over a year now, and I can't find the answer...
Dec3-03 09:25 PM
Mr. Robin Parsons
25 3,587
http://arxiv.org/list/gr-qc/0311 http://arxiv.org/PS_cache/gr-qc/pdf/0311/0311021.pdf ...
Dec4-03 05:23 AM
wolram
7 1,407
If you take two identical radioactive samples, place one on Earth and another on a near-lightspeed spaceship, and...
Dec5-03 04:49 PM
mathman
4 2,124
Can someone explain aether to me in depth? I hear talk about it, and feel rediculous not knowing what they're talking...
Dec5-03 06:41 PM
jcsd
1 1,600
... Hydogen's Mass or 'Weight' is negative (i.e. less than 0 kg) Given a Balloon filled with 'Hydrogen'...
Dec5-03 10:35 PM
Nereid
6 2,989
on the subject of looking for the granularity of spacetime, cherenkov radiation is given of if a particle exceeds c...
Dec6-03 03:36 PM
wolram
12 1,930
After recently seeing Brian Greene's "Elegant Universe," I was struck by an idea - maybe not an original idea, but an...
Dec6-03 03:53 PM
Ambitwistor
1 1,685
suppose you had a planet with a train going all the way around the circumference. The train is a complete loop so you...
Dec6-03 05:52 PM
GijXiXj
16 5,677
I given to understand that you can't tell the difference between accelerating in space and standing in a gravity well,...
Dec6-03 06:43 PM
Vosh
36 2,687
I have a question concerning the treatment of black holes in General Relativity. As I understand it, the force of...
Dec8-03 09:48 AM
Ambitwistor
9 1,700
1. The time distortion due to relative velocity does not cause any "real" loss if time in itself,loss of time only...
Dec8-03 10:10 AM
Ambitwistor
21 2,373
ok, so I'm sitting in class one day, and my physics teacher is talking about light... and since we had just finished...
Dec8-03 04:21 PM
mathman
4 12,307
Let's say there are two objects of the same mass. One of the is moving, the other not. Now let's look at both of them...
Dec10-03 05:05 PM
Tail
6 1,677
I keep finding stuff on the net about the speed of gravity and how some people contest it should be c, the speed of...
Dec11-03 04:27 PM
BracaleRon
25 4,878
Ok, lets say that we are in a giant vaccuum, but we have a crapload of space. A crapload. And we get a really powerful...
Dec11-03 10:46 PM
Wooh
4 1,218
PSR J0730-3039 is similar to the famous neutron binary which Taylor and Hulse studied, leading to another set of...
Dec12-03 08:42 AM
Nereid
0 3,689
If I were to attempt to prove that the dot product of an electric and magnetic field is invariant under the conditions...
Dec12-03 09:37 AM
DW
1 3,867
If someone leaves on a spaceship from Earth at near the speed of light, the clock on the spaceship will appear be...
Dec12-03 09:58 AM
DW
3 1,693
imagine two people in deep space, with no frame of reference but each other. if one of them is speeding along at near...
Dec12-03 06:54 PM
dace
44 3,493
how special and the general relativity explains the position of moon from the earth reference system taking also into...
Dec15-03 09:33 AM
quantum
8 1,462
Lets say a ship, travelling 98% the speed of light approaches another ship travelling the opposite direction at the...
Dec15-03 05:20 PM
TheDonk
24 2,777
In time dilation and length contraction, there is a velocity term. How do we measure velocity at the first place?
Dec16-03 09:35 AM
hemmul
2 1,006
Here's a few kickers for those of you who don't know a lot about the mathematics of relativity: The locus of all...
Dec16-03 07:06 PM
chroot
1 1,162
Particles having nonzero rest mass can approach, but not reach, the speed of light, since their mass would become...
Dec16-03 10:21 PM
DW
4 1,056
Is this true? Einstein's E=mc2 'was Italian's idea' Rory Carroll in Rome Thursday November 11, 1999 The...
Dec17-03 02:00 PM
chroot
7 2,135
I just read in a popular magazine about the satellite to be launched in order to measure the frame dragging by a...
Dec17-03 03:42 PM
selfAdjoint
5 2,542
Maxwell's eqn, in invariant form reads: F^{\mu \nu}{}_{;\nu} = J^{\mu} and F_{\alpha \beta ;\gamma} +...
Dec18-03 09:53 AM
DW
3 1,047
http://www.spacedaily.com/news/cosmology-03i.html For the second time in as many months, images gathered by the...
Dec18-03 11:01 PM
Nereid
19 2,469
this is a really good survey of all the cosmic ray and gammaray burst news, and the new detectors planned, with some...
Dec19-03 09:26 PM
marcus
2 2,528

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