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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 42,426
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
ZapperZ
1 42,785
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
selfAdjoint
30 20,338
In The Elegant Universe, Briane Greene states that, "Einstein proclaimed that all objects in the universe are always...
Mar25-04 09:48 PM
turin
7 1,224
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
ranyart
6 1,786
http://math.ucr.edu/home/baez/ if any one wants to refute mainstream views its worth having a look at this web...
Mar26-04 07:29 AM
Janus
1 7,060
I would apprecite it if someone could please check my spacetime diagram for the following scenario. I appreciate any...
Mar26-04 04:10 PM
pmb_phy
8 1,926
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
Nim
1 1,169
http://science.nasa.gov/headlines/y2004/26mar_einstein.htm?list531723 This would test the predictions of GR 30,000...
Mar27-04 11:16 PM
yogi
6 1,437
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
pmb_phy
10 3,517
Stephen Hawking states three possabilities of a Grand Unified Theory: 1.There really is a complete unified theory,...
Mar29-04 05:45 PM
Phobos
2 1,466
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
DrChinese
4 2,132
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
TeV
8 1,410
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
cripkd
9 1,767
What is "FOR"? I believe it an acronym having to do with the doppler shift? :confused:
Apr1-04 07:13 PM
ahrkron
1 918
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
Mike2
3 1,281
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
JJ
10 1,393
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
jdavel
10 2,390
http://www.cnn.com/2004/TECH/space/04/02/einstein.satellite.ap/index.html
Apr5-04 10:43 PM
Creator
2 971
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
arildno
1 971
What is the Double Special Relativity theory? I know what SR is, but D SR? :confused:
Apr7-04 03:32 PM
p_branes
1 885
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
PRodQuanta
8 1,483
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
yogi
5 1,810
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
turin
9 2,519
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
jdavel
10 1,216
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 1,177
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
DW
6 1,282
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
OneEye
2 976
(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
OneEye
2 876
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
turin
8 1,252
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
DW
6 1,648
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
DW
7 1,226
I'm trying to understand a abstract principle of travelling at light speed. My understanding of anything that...
Apr13-04 09:14 AM
OneEye
16 8,965
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
OneEye
4 914
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
billy_boy_999
5 1,878
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
Nereid
9 1,852
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
turin
5 7,842
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
Integral
29 1,969
april 2004 paper http://arxiv.org/abs/hep-ph/0404014 Decoherence has the potential to explain all existing...
Apr18-04 12:57 PM
Erich Schoedl
7 1,180
The Doppler effect corresponds to a percieved change in the wavelength of impinging light, correct? Does this mean...
Apr19-04 07:27 AM
TeV
18 1,880
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
Janus
105 7,926
Gravity probe launching countdown : For those who haven't heard yet...After almost 40 years ,one of the neatest...
Apr19-04 07:46 PM
turin
2 1,257

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