
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...

Dec3107 02:06 AM
jtbell

0 
41,945 
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Feb2313 08:40 AM
ZapperZ

1 
42,311 
Lorents and Einstein both made equations to describe time dialation. One of these equations was used in quantum...

Mar2412 06:25 PM
D H

71 
5,263 
So my physics teacher has been trying to explain magnetic forces in terms of electric forces and relativity but I'm...

Mar2512 09:40 AM
Naty1

5 
1,688 
I read about Einstein's hole argument and about diffeomorphism. Pasive diffeomorphism is changing of coordinate...

Mar2512 01:02 PM
momchil

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3,474 
Hi Physics Forumites
I have tried to find a post which I didn't bookmark  foolish me. It discussed uniform...

Mar2512 02:10 PM
qraal

2 
784 
1) How can get work done on a photon because work done = kinetic energy it depends on mass, but the rest mass of a...

Mar2612 08:29 AM
Mentz114

5 
1,336 
I know that magnetic force due to a current carrying wire on a test charge moving w.r.t the wire(along the wire), can...

Mar2612 05:20 PM
DaleSpam

156 
13,465 
Hi all
I am new to relativity, and through the books that I have chosen to learn the subject (that cater to my...

Mar2612 08:18 PM
Capngarrett

6 
1,355 
Hi all.
I keep coming across the term "quadratic gravity" in various GR papers and don't entirely understand the...

Mar2712 06:23 AM
graupner1000

2 
1,199 
Blame it on Woodstock. Can I ask a stupid question? Actually two of them?
First off, I'm not a physicists. I write...

Mar2712 04:57 PM
harrylin

12 
1,108 
How accurate are the muon velocity measurements in storage rings, for muons generated in hadron colliders like CERN....

Mar2712 09:18 PM
arindamsinha

7 
1,224 
In SR the points in Minkowski space correspond to events. I recently read in a GR lecture note that the points on the...

Mar2712 10:54 PM
julian

24 
2,840 
I have a dufficult question which I couldn't find an answer to, yet:
If I am standing in front of a mirror  I can...

Mar2812 03:51 AM
Austin0

36 
3,832 
Hi, a while back i had ran into the equation for dynamic mass and had immedietly taken an interest in it in that it...

Mar2812 05:43 AM
jtbell

14 
1,997 
What would happen to the spacetime fabric when two super massive blackholes collide. I know that they would orbit each...

Mar2812 07:07 AM
Vanadium 50

6 
1,809 
I have no idea about it,
as my understanding,that Mr.Einstein depicted that what actually happening in space are...

Mar2812 07:14 AM
doey

2 
877 
This link is confusing me.
http://hyperphysics.phyastr.gsu.edu/hbase/relativ/muon.html
In this link, with...

Mar2812 10:07 AM
ghwellsjr

2 
875 
I don't want to beat a dead horse with anyone fixed on dogma, but I do understand the theory of relativity and the...

Mar2812 03:48 PM
jtbell

5 
1,057 
Two individuals A and B are traveling through space at a velocity in the "x" direction at and are next to each other...

Mar2812 04:56 PM
GeorgeDishman

17 
2,117 
Ok, I want to make sure I understand this correctly.
Let's say I'm moving at 90% c and pass a light bulb that is at...

Mar2812 06:24 PM
ghwellsjr

1 
852 
I searched this site and could not find any referances for what a good lightspeed ship would look like. Does anyone...

Mar2812 09:41 PM
PAllen

5 
1,067 
In classical physics, the force on an object experiencing constant acceleration is equivalent to the "gravitational...

Mar2912 11:49 AM
Chestermiller

15 
1,951 
Hi all,
It doesn't seem that a relativistic ship travelling in deep space would need much shielding due to...

Mar2912 03:24 PM
PAllen

1 
930 
How can we calculate force of gravity between two objects using Einstein's relativity theory. Using Newton's method we...

Mar2912 06:14 PM
pervect

2 
875 
Hello I need help with a problem: If I see two identical charges moving in the same direction parallel to each other...

Mar2912 09:11 PM
Bob S

17 
3,079 
Is it possible to formulate a dynamical theory of spacetime geometry that isn't invariant under active...

Mar3012 01:28 AM
julian

4 
911 
Can you explain Einstein's train metaphor/thought experiment.
Thanks

Mar3012 06:15 AM
harrylin

6 
1,849 
So the confusion I'm having here really has to do with parity inversion in spherical (or boyerlinquist) coordinates. ...

Mar3012 12:28 PM
michael879

62 
5,877 
Hello all,
Having read many threads and posts about light, it’s speed c, SR etc, the particular issue of not...

Mar3012 03:29 PM
DrGreg

56 
5,554 
Hi all
One things that puzzles me is the speed of light. We measure it always the same speed independently if we...

Mar3012 04:57 PM
kamenjar

12 
1,765 
these should be some very easily answered questions. how does anyone know photons exist? im guessing they can be...

Mar3112 12:51 AM
Austin0

8 
2,133 
For the following twodimensional metric
ds^2 = a^2(d\theta^2 + \sin^2{\theta}d\phi^2)
using the EulerLagrange...

Mar3112 04:57 AM
alex3

2 
912 
Hi, I'm not sure if this is the right subforum because i know very little about this kind of stuff :/ But something...

Mar3112 09:07 AM
HallsofIvy

50 
5,509 
I am trying to understand FRW universe. To do so I am following the link below:
...

Mar3112 03:21 PM
psimeson

21 
3,376 
Where can I find the exact form of variation of ChernPontryagin invariant for fourdimensional space (free on the...

Apr112 03:29 AM
archipatelin

0 
813 
hy guys,so Einstein jad a quote "everything is relative" but he proved that lightspeed has speed c relative to any...

Apr212 04:12 AM
A.T.

2 
1,001 
Hi,
Now we have the "faster than speed of light" neutrinos, I was wondering the next philosophical question:
If...

Apr212 09:37 AM
yuiop

11 
4,532 
Sometimes I get frustrated with the dialogs in this forum because there are so many misunderstandings and outright...

Apr312 01:45 AM
Austin0

27 
2,239 
Suppose, a long object is at rest in S frame. There is A (On the long object) and B (Near the long object, on the...

Apr312 04:25 AM
harrylin

29 
2,847 
Is there any such relation as per general theory of relativity?

Apr312 10:55 AM
clamtrox

68 
4,834 
In relativity, proper time along a worldline is be defined by d\tau^{2} = ds^{2} / c^{2}
However, proper time can...

Apr312 01:26 PM
PAllen

5 
1,155 