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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
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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
1 41,099
Was Einstein really a genius or just someone clever with new ideas? SR is really a simple theory and uses many ideas...
Mar25-04 09:47 PM
30 20,006
In The Elegant Universe, Briane Greene states that, "Einstein proclaimed that all objects in the universe are always...
Mar25-04 09:48 PM
7 1,199
Is time believed to be a constant or is it merely a function of the perception of the observer? My understanding is...
Mar26-04 03:58 AM
6 1,757 if any one wants to refute mainstream views its worth having a look at this web...
Mar26-04 07:29 AM
1 7,038
I would apprecite it if someone could please check my spacetime diagram for the following scenario. I appreciate any...
Mar26-04 04:10 PM
8 1,837
ok, this is gonna be my science fair experiment, so tell me if you see any holes in it: if a huge planet or star is...
Mar26-04 05:28 PM
1 1,144 This would test the predictions of GR 30,000...
Mar27-04 11:16 PM
6 1,389
My direct question is at the bottom of this post, but I thought I would set the scene. Skip the first part if you...
Mar29-04 04:19 PM
10 3,387
Stephen Hawking states three possabilities of a Grand Unified Theory: 1.There really is a complete unified theory,...
Mar29-04 05:45 PM
2 1,355
Is it true that theoretically, you can use a wormhole to travel into the past? How so? Does this whole idea not...
Mar30-04 09:00 AM
4 1,928
light or radiation from a faroff galaxy seems to us to have been travelling for, let's say, 5 billion years - but does...
Mar31-04 10:12 AM
8 1,368
It's known that information about an event cannot travel faster than the speed of light. On the other hand...
Apr1-04 02:57 AM
9 1,739
What is "FOR"? I believe it an acronym having to do with the doppler shift? :confused:
Apr1-04 07:13 PM
1 910
First of all, I have to say that I was thinking long about whether to post this in the Philosophy of Science forum or...
Apr2-04 09:16 PM
3 1,264
While reading one of Starthrower's threads, I became quite confused. If an object moves at close to c relative to...
Apr4-04 07:43 AM
10 1,370
what happens when there is a mass change in an object? the mass change is due to its change in its velocity, like...
Apr5-04 08:29 PM
10 2,348
Apr5-04 10:43 PM
2 961
Anyone knows why the symbol c was chosen to represent the speed of light in vacuum? Or is there no reason really?
Apr7-04 02:57 PM
1 958
What is the Double Special Relativity theory? I know what SR is, but D SR? :confused:
Apr7-04 03:32 PM
1 879
I wonder, doesn't GR predict that space shrinks near the surface of a heavy mass such as a black hole. If you had...
Apr7-04 07:47 PM
8 1,462
Our earth spins on its axis at 1600 km/hr, and then travels around the sun at some higher speed (i don't remember...
Apr7-04 10:12 PM
5 1,769
Has anyone here ever actually tried to prove (analytically) that space is three dimensional? I've never seen a good...
Apr9-04 07:24 PM
9 2,337
I missed something when I learned about Relativity. Everyone knows that story about twins. If one takes off in a...
Apr10-04 07:48 PM
10 1,127
My question concerns gravitational time dilation and time time dilation due to motion. If an outside observer views a...
Apr11-04 11:26 PM
Loren Booda
1 1,151
how can the equation of relativistic mass, m=m_0/(1-v^2/c^2)^2, determine mass from the variable m_0? rest mass -...
Apr12-04 09:36 AM
6 1,253
I am an amateur, reading Einstein's Relativity for the first time. Naturally, I have questions. I am not aiming...
Apr12-04 10:36 AM
2 954
(I apologize in advance for the length of this message. I will endeavor to be more brief in the future. The advanced...
Apr12-04 10:53 AM
2 858
Say you have a gyroscope, rotating in the ole' proverbial Star Trek "dead of space", far enough away from any...
Apr12-04 11:33 PM
8 1,226
The first of my two questions concerns the aspect of SR that deals with the mass of an object increasing as is moves...
Apr13-04 04:25 AM
6 1,591
I am trying to understand how to use the lorentz transformation to calculate things and I have a few questions about...
Apr13-04 04:41 AM
7 1,185
I'm trying to understand a abstract principle of travelling at light speed. My understanding of anything that...
Apr13-04 09:14 AM
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Sorry about the title of this, but with 50+ views of my previous message and only one reply, I surmised that I need to...
Apr13-04 09:16 AM
4 899
has there been an experiment verifying the compressing of light's wavelength by gravity? i thought i heard of one...
Apr13-04 09:55 PM
5 1,853
Not sure where to put this, so I'll drop it here. It seems that both NASA and ESA are committed to performing tests...
Apr14-04 08:52 AM
9 1,816
Presently, I'm reading an e-book I found on the internet titled "Relativity: The Special and General Theory", which...
Apr14-04 07:12 PM
5 7,698
Does GR say that the expansion of the universe must exist? Would this mean that there is a tendency to flatten out...
Apr14-04 07:29 PM
29 1,946
april 2004 paper Decoherence has the potential to explain all existing...
Apr18-04 12:57 PM
Erich Schoedl
7 1,156
The Doppler effect corresponds to a percieved change in the wavelength of impinging light, correct? Does this mean...
Apr19-04 07:27 AM
18 1,837
firstly, i'm an ignoramus secondly, doesn't the fact that lights speed cannot be affected by the speed of a body...
Apr19-04 07:57 AM
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Gravity probe launching countdown : For those who haven't heard yet...After almost 40 years ,one of the neatest...
Apr19-04 07:46 PM
2 1,226

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