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

Dec3107 02:06 AM
jtbell

0 
42,420 
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Feb2313 08:40 AM
ZapperZ

1 
42,779 
1. if we move at this speed time is slow for us so what about the outer world does it seems faster to us?
2. people...

Jul311 06:42 AM
George Jones

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1,221 
Ok. Let's say a fan is spinning at the speed of light. ( Imagine folks;)
If i shine a light ray towards it, light...

Sep1306 09:35 PM
baryon

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4,456 
First of all, I'm an electrical engineer, I had to take a class on modern physics, so answers don't need to be "dumbed...

May1908 09:51 PM
phyti

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3,252 
arXiv:grqc/0401102 v1 26 Jan 2004
A New Approach in Quantum Gravity
and its Cosmological Implications
Simone...

Feb1804 01:39 PM
wolram

2 
1,219 
From wiki:
'A "red herring" is a debating tactic that seeks to divert an opponent. A digression can, similarly, be...

Sep2510 11:14 AM
ClamShell

3 
987 
I often hear from laymen who study some SR that if sth reaches the speed of light,it completely turns into energy!!!...

Aug2012 04:09 PM
cosmik debris

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547 
Variation of EH action is:
\delta S_{EH}=\int_{\Omega}{\delta(R\sqrt{g})dx^4}=
...

May1910 06:36 AM
haushofer

1 
1,009 
A and B are twins,A notice B moving away from him with velocity v, so A notice that B is youngerv than him (time...

Nov2309 09:19 AM
HallsofIvy

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967 
Subject: A Baffling Quote from Einstein, badly requiring explanation
All sources I've consulted indicate that...

Mar2509 10:14 PM
feynmann

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5,292 
If you are standing on the earth and you drop a ball, the ball falls to the ground due to the force of gravity acting...

Aug2814 05:49 PM
my2cts

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551 
I have very little knowledge in general relativity, though I do have a decent understanding of
the theory of special...

Mar1012 08:11 AM
Chestermiller

3 
1,218 
Hello,
It is my understanding that in the case of two observers (A and B) passing each other at high speeds that due...

Feb1714 03:11 AM
Nugatory

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316 
Dear all,
First, please forgive my english, I am French.
In most textbooks on general relativity (GR) the non...

Apr1810 07:16 PM
halcon

3 
1,030 
If a train goes past an observer at 100km/hour and someone on the train fires a bullet from a gun in the direction the...

Aug2210 07:45 AM
jtbell

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1,851 
The line element in a rotating plane, with angular velocity \omega is given,
in polar coordinates (t, r, \theta) by (...

Apr908 02:31 AM
Ich

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2,490 
The laws determinning the passage of light through varying densities of transparent material and through varying...

Aug2405 05:13 PM
Phobos

6 
1,718 
If we have EinsteinHilbert Lagrangian so:
\mathcal L = (g)^{1/2}R for R Ricci scalar (¿?) then my question...

Jan1007 02:50 PM
Chris Hillman

1 
1,841 
I have a doubt regarding the speed of light. What makes it impossible to achieve it. Why cant we have a relative...

Aug110 05:39 PM
DaleSpam

12 
1,342 
If two stars, both slightly above their Schwarzschild radius collide, can a joint horizon form before they come in...

May213 09:20 AM
Bill_K

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1,052 
Suppose I dive head first into a black hole of size 100 light second from far away. When I reckon that I will cross...

Nov906 11:53 PM
wywong

10 
1,435 
Hello
An old friend of mine just came to me in the early morning and asked about a book on GR and how it manages...

Mar2910 04:38 PM
Altabeh

0 
475 
Hello all. First time posting here.
I have a basic understanding of special relativity and I have few questions...

Dec2009 05:01 AM
yuiop

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3,526 
A bus travels at a very high speed. It's time slows down.
What's the mechanism by which this happens?
Any help...

Sep1111 06:52 AM
HallsofIvy

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1,675 
Consider a light clock, i.e. two ideal mirrors, mounted in parallel with a vacuum in between, such that, in principle,...

Jan511 03:47 PM
birulami

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1,038 
You are an observer fixed in absolute space watching clocks pass between two points, A and B, separated by 1km. The...

Feb2406 08:50 PM
clj4

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2,246 
http://i209.photobucket.com/albums/bb185/BobC_03/Block_Universe_1.jpg...

Dec3111 09:02 PM
George Jones

85 
9,453 
I push a ball on the ground and it comes to rest after some time.
It is a case of motion turning into rest.
I...

Jul813 02:25 PM
DaleSpam

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940 
There are several measures of distance for a free falling observer in a Schwarzschild solution.
I think it would be...

Nov611 12:22 PM
Passionflower

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536 
Okay, so the title is overly dramatic, but I couldn't think of anything else to call this. Not trying to actually...

May2010 11:35 PM
Passionflower

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2,687 
Hello All,
in 4space, the position is x=(x0,x1,x2,x3), where x0=ct
The question is 
Can one define the clock...

May412 03:56 AM
GeorgeDishman

10 
1,413 
In General Relativity spacetime is described by a metric. The most common one is the Schwarzschild metric, valid at...

Aug1614 04:39 PM
rlshuler

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318 
If I am understand correctly a moving mass has more energy than a stationary mass. Mass and energy are two forms of...

May314 11:44 AM
PeterDonis

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422 
I was wondering what book would be useful in learning special relativity and basic general relativity. I know vector...

Mar1907 06:12 AM
Demystifier

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3,750 
My textbook says that a compressed spring has more mass than when it is not compressed. I'm assuming that this is...

Mar1712 02:01 PM
bobsmith76

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6,472 
Over time, I've realized there are certain limits to how far the human imagination can go. Even for simple things, it...

Mar708 05:39 PM
Gear300

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2,881 
Can someone explain to me how those who believe relativity also believe that the earth revovles around the sun. I...

May309 05:13 PM
Modman

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2,153 
Hey everyone, for anyone who saw my thread in the chemistry section you know I'm changing my view point to that of the...

Jan2614 05:45 AM
llynne

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515 
In another thread (on OppenheimerSnyder collapse), I posted a link to some lecture notes on gravitational collapse....

Nov1612 06:48 PM
PAllen

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852 
Hi all, I'm in a modern physics course and am surprised by how confused I am about special relativity. I know...

Oct912 01:17 AM
ghwellsjr

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1,205 
Suppose two people, each in his own craft, set apart by significant distance and stationary to each other. Both...

May513 08:26 AM
Doc Al

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475 