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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 42,487
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 42,141
Are we looking for gravity waves to help prove theories or are there possible practical uses for them? ie would the...
May15-08 10:35 AM
robphy
2 1,246
Has any reaserch facility in the world developed a way to create gravity waves, sizable ones? Regards, Nenad
May15-08 08:53 AM
DavidWhitbeck
14 2,108
Ok in my class we just started reviewing relativity and I had a really hard time grasping it. My teacher says that...
May15-08 07:20 AM
DaleSpam
4 983
In GR, what is the energy of a system of two identical bodies rotating around their center of mass with regular...
May15-08 05:28 AM
I_wonder
1 1,763
With reference to the sketch attached, if A and B is having a relative velocity of 0.9c,and B and C having a...
May14-08 06:53 AM
DaleSpam
31 4,266
Let's say, there are two observers A and B moving with respect to each other with relative velocity v. Now, when we...
May13-08 10:31 PM
MeJennifer
6 2,046
Here is a simple question. How can an observer measure length (or length contraction) of a cylindrical Iron rod,...
May13-08 02:40 PM
phyti
4 1,923
How can we decide which process is causing light to bend near the surface of a star? Gravity is said to cause light...
May13-08 01:06 PM
AntigenX
4 1,562
There have been some threads on relativistic wheels/balls from the view of a road the wheel/ball is rolling on, with...
May13-08 10:01 AM
Wizardsblade
18 2,915
Hi, First of all let me clarify, I understand that nothing with mass can move at the speed of light or higher. I...
May13-08 03:17 AM
benabean
10 2,405
How small a box can you confine a photon to before its mass is large enough to form a black hole? I think you can...
May12-08 11:17 PM
yuiop
2 2,584
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 2,137
Attached are some notes that I made regarding the relativistic Doppler effect. They are about 4 pages long, and gives...
May12-08 11:47 AM
shalayka
0 2,095
Dear all, Following is a problem, I suppose, is related to some controversy called "Dingle's Dilemma", as I read...
May11-08 08:59 PM
DocZaius
57 4,943
Wiki If speed susceptible to Doppler's effect. Why shouldn't field since we're so determine they have a speed?
May11-08 10:12 AM
russ_watters
1 809
Hi I am interested in studying special and general relativity at a mathematically rigorous level, and I need to know...
May10-08 04:11 PM
DavidWhitbeck
11 3,293
Hello !!! i would like to know what i should know to move on to the general and special relativity regarding to...
May10-08 11:21 AM
robphy
4 955
I am trying to clarify a number points regarding both redshift and blueshift in the context of relativity. Standard...
May10-08 07:31 AM
mysearch
5 1,924
Ok guys, Explain me this. In twin paradox, one of two twins, paul and peter, when paul goes for a space ride at...
May10-08 06:29 AM
MeJennifer
7 1,558
You hold in the palm of your hand a classical particle with momentum P = (E,cp_{x},cp_{y}, cp_{up}) where cp_{up}=0...
May9-08 12:52 PM
DaleSpam
12 1,391
Does a photon curve space-time, i.e., produce a gravitational field? Is the degree of curvature a function of its...
May9-08 08:41 AM
exponent137
38 12,388
When we derive equation of motion by variation of the action, we use rules of ordinary differentiation and...
May9-08 02:36 AM
arroy_0205
8 2,532
I just have a question relating to Mass Dilation; Mass is defined (by the dictionary) as Now, mass is a...
May8-08 06:58 PM
DaleSpam
3 1,357
Am I right in assuming that Gravity Probe B has proved that the rotation of the earth (@~465metres /sec.) 'swirls'...
May8-08 02:15 PM
Nickelodeon
2 1,197
I just posted about what is termed "apparent superluminal velocity of galaxies" and gave a website of an article...
May8-08 02:06 PM
RandallB
11 3,517
Well, let's say we put energy to spin every particle in an atom. Do spinning them faster have relativistic effects as...
May8-08 12:20 PM
pam
1 1,312
Place equal amounts of matter and anitmatter in a box on a scale. It's a very good box; it's very reflective, and...
May8-08 09:43 AM
pmb_phy
13 2,210
I know that the speed of light cannot be attained in vaccum as by the time of reaching there, mass increases...
May8-08 05:35 AM
Hootenanny
1 1,256
I am looking for an expression for the total energy of a particle of rest mass m_0 that includes kinetic and...
May7-08 07:54 PM
snoopies622
10 1,507
I took a course in special relativity as an undergrad, but am now almost 6 years removed from it and have not retained...
May7-08 03:56 PM
jtbell
6 1,583
Hi all, I've been dusting off the grey matter a bit, and have a question regarding an example I found used in both...
May7-08 02:49 PM
sumofprimes
17 6,054
Hi! I am studying special relativity and I still don't understand completely the relativity of time dilation: each...
May7-08 02:22 PM
dude222
7 1,911
Is it plausable to take into account the speed of the earths spin when calculating tmie dilation for satellites and...
May7-08 01:31 PM
mogsy182
1 1,178
So is it the closer you are to the centre of a body the slower time will go? or is it the other way round. also why is...
May7-08 12:53 PM
shalayka
2 1,007
I got a master degree in physics and I still found that this is difficult to expalin Faraday's law of induction within...
May7-08 12:36 AM
dude222
3 4,235
I posted a simple thread regarding Lorentz transforms, but it has been locked for "staff review". May be because I...
May6-08 04:41 PM
mitesh9
20 3,109
My question is simple. I made a bet with my physic teacher. :cool: I believe time can contract. When two bodies are...
May6-08 11:46 AM
DrGreg
29 3,584
Can anyone explain me what is physical significance of "Lorentz Transforms"? That means, apart from the math, how...
May6-08 03:57 AM
Integral
18 2,859
Ok, I'm uneducated in physics and all I know is what I've learned from the internet and a single book "universe in a...
May5-08 10:49 PM
Chrisc
24 3,368
What is Aether supposed to be now days (and in Einstein's day)? Isn't Aether just space and time (and maybe their...
May5-08 10:06 PM
Ken G
37 3,084

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