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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 42,763
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 42,405
Suppose we have an observer at a large distance from the event horizon of a black hole, pouring matter towards the BH...
Dec8-05 01:16 PM
JesseM
6 2,151
Hi. The higher the velocity of an object the more energy this object has. Velocity is purely relative. When I move...
Dec28-10 10:30 AM
lightarrow
12 2,151
Hi, I've been listening to a Professor Jim Al-Khalil's scipod on time travel. I think this guy is bloody...
Nov17-11 06:10 AM
Dickie_Boy
9 2,151
I understand that the time dilation at the surface of the Earth is the same as for an object moving in space at...
Nov17-11 02:33 PM
Shaw
0 2,151
What is the simplest derivation of the transformation rules for Maxwell's equations in special relativity? I'm...
Apr5-14 02:14 AM
Fredrik
17 2,151
There is a classic result by Tolman, Ehrenfest, and Podolsky that in classical GR, the interaction between pencil...
Jul17-11 03:17 PM
yuiop
18 2,150
I think I have come across something that invalidates something one of my Physics professors said back in college,...
Jun25-14 09:23 PM
DaleSpam
27 2,150
Consider a 4-coordinate system x=(x^0,x^1,x^2,x^3), x^0 plays a role of time, x^1, x^2, x^3 are some kind of space...
Aug11-09 10:01 PM
vin300
20 2,149
I thought I'd present some plots for the Fermi-normal coordinates (only in the r-t plane) for someone falling into a...
Nov19-10 03:37 AM
pervect
12 2,149
I like to do whirlies with the kids down in my local park. I grab them by the feet and I spin them in a circle with...
Apr9-08 07:55 PM
michael879
24 2,148
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 2,148
Hi, it's very interesting, that many parts of special relativity were developed before Einstein by Lorentz, Larmor...
May12-08 01:01 PM
peter0302
10 2,148
According to my physics textbook, the equation E^2=\left(mc^2\right)^2+\left(pc\right)^2 suggests that a particle may...
Jul4-11 12:09 PM
Parlyne
15 2,148
Any faster than light signal can create backward time effect by means of some frames seeing the signal go to the past...
Nov21-11 08:31 PM
Fredrik
13 2,148
Okay, so I'm a total noob at physics but I'm interested in it, so please bare with me... It's discribed that space is...
Dec31-06 01:14 PM
pervect
1 2,147
Does space limit the velocity of light or is it the formulas of relativity that limit the velocity of light? Isn't a...
Oct16-13 10:13 AM
kaplan
11 2,147
Matt Visser has a neat derivation of the Schwartzschild solution of Einstein's equations from Newtonian gravity, the...
Aug29-10 02:31 AM
JesseM
6 2,146
Hello! My name is Alexandru, i am from Romania student at Mechanics University. I am working on a project and i...
Aug14-08 01:09 PM
George Jones
13 2,146
Hey guys, I've been trying to find out about the expected effect of acceleration and/or motion on a pendulum clock; I...
Feb15-12 05:50 AM
harrylin
9 2,146
Can someone tell me what the numerical value for the entropy of a black hole of five solar masses would be? Is it a...
Aug6-04 08:21 AM
kurious
2 2,145
I do not know the details, but I have read that some theories allow backwards time travel using wormholes. Backwards...
Dec9-09 11:56 PM
Dmitry67
18 2,145
In the following article ...
Jul24-11 09:45 PM
bcrowell
9 2,145
I have posted links to the original papers on Relativity : the Special and General Theory made by Albert Einstein ...
Jan5-06 02:32 PM
Tom Mattson
3 2,144
Okay, I know there is observational evidence for spinning black holes, so therefore I must be confused about...
Oct17-11 12:08 PM
Constantin
6 2,144
I understand that magnetic force is a relativistic effect of electric force. Is there a force which is the...
Jul3-08 12:30 PM
rbj
12 2,144
Am not sure if this belongs more in quantum physics or in GR, it's at the intersection of the two. If I understand...
Jul15-08 12:20 PM
George Jones
9 2,144
Roger Penrose is reported to have said: And I understand that, in Minkowski space-time, the relative velocity...
Nov29-09 03:01 AM
Grimble
7 2,144
Let us say we have a very long glass that has a uniform square cross section. Its long axis is aligned with the x...
Mar18-12 05:20 PM
yuiop
18 2,144
Ok. There are some concepts here that I am having trouble reconciling. I would first like to "stipulate" that for...
Mar14-08 07:12 AM
tiny-tim
9 2,143
If mass of a moving object is as below: http://upload.wikimedia.org/math/0/2/a/02a09d2ef62edff59459f51b329877df.png...
Sep22-11 05:10 AM
harrylin
8 2,143
I have encountered a difficulty which arises from my attempt to combine non collinear Lorentz transformations in...
Jul12-14 09:46 AM
nixed
12 2,143
i dont understand a problem :confused: if i two photons A & B travel in a straight line but in opposite directions...
Jul12-06 01:32 PM
robphy
15 2,142
If two objects, let's say two pool balls (or giant balls of neutronium for that matter), are placed in a closed...
Sep11-08 09:20 PM
MeJennifer
21 2,142
This is probably a repeat question from somone somewhere, but here goes. Please fill in the blanks. I don't need a...
Jul30-09 04:14 PM
solveforX
22 2,142
Dear Forum Users, I am a graduate student in Mathematics and not physics, so please bare with me. Also, I know that...
Feb19-13 05:18 PM
FeynmanIsCool
30 2,142
This is another version of bell’s spaceship paradox. Consider two spaceships A & A’ separated by a distance L, and...
Oct3-13 09:18 PM
DaleSpam
12 2,142
I imagin this thought experiment: a train which travels with the speed of light is trying to enter a tunel which has...
Sep9-07 03:30 PM
Doc Al
7 2,141
Sorry to bring up again a question that I asked before but I am still confused about this. In SR we have Lorentz...
Mar31-08 07:36 AM
Ich
3 2,141
what is to top speed that this rocket can achieve as seen by a stationary observer? Also if you look at the...
Jun5-08 01:10 PM
neh4pres
22 2,141
As you will see this is my first post so I apologize if I have chosen the wrong sub-forum. My academic training...
Feb26-12 10:10 AM
childej
8 2,141

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