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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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Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
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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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I donít see that this question has been asked before and I am hoping the generous moderators of this forum will be...
Nov21-07 10:21 AM
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1. Let S be a stationary x-coordinate system. Let S' be a stationary x'-coordinate system. Let the x'-axis of system...
Apr3-08 05:43 PM
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According to Einstein's equation E=moc2, any object which has mass has energy, and, conversely, anything which has...
Nov10-11 01:36 AM
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Suppose I am an observer stationed at the origin of frame O, watching a frame O' pass by me at some velocity u. If I...
Sep19-06 11:27 PM
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Does anyone know who first posed the energy relation E2=m2c4+p2c2 and where its original appearance can be found?
May25-11 04:06 PM
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Hi, I am doing exercises regarding relativity. I know how to calculate relative speed in one dimension, but I have...
Aug13-04 06:25 PM
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What are the examples of superluminal events which do not transmit information or energy, and hence not violating...
Jun29-11 02:44 PM
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Suppose one prepares two particles in an entangled state (at point S) and that one has detectors (say A and B) at...
Sep14-06 10:33 PM
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If I accelerate to .9c I am gaining mass, but if I reverse thrust and decelerate why aren't I still adding mass since...
Sep27-07 04:47 PM
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If time were to go in reverse, how exactly would the universe, and humans act? For instance, humans can think and be...
Feb11-05 11:46 AM
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Hi, it's very interesting, that many parts of special relativity were developed before Einstein by Lorentz, Larmor...
May12-08 01:01 PM
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please let me know what is a significance of lorentz factor,and what will happen if lorentz factor is not multiplied...
Aug21-11 09:00 AM
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What if absolute motion was detected, would this mean to Einstein's theory of special relativity? Callisto
Apr11-05 05:53 PM
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Where is the horizon of the AdS space? What's the relationship between AdS space and black hole? Is there any...
Nov29-06 12:12 PM
Chris Hillman
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I think this "elephant-in-the-room" issue is important enough to deserve its own thread. I believe it is at the root...
Mar17-11 07:10 PM
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General relativity states that all free falling bodies follow spacetime geodesics. A geodesic is a path of extremal...
Apr11-11 04:20 PM
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First please forgive me, if my question is in the wrong board. Dear members. I'm only Junior High School...
Feb13-12 11:28 AM
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hey , i was wondering if this would be true : at school we often tell us that the universe is in a constant...
Sep15-07 01:23 PM
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what is to top speed that this rocket can achieve as seen by a stationary observer? Also if you look at the...
Jun5-08 01:10 PM
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I am aware of the motives of finding a modification of Newtonian mechanics, but the effects of relativity are so...
Oct9-12 11:41 AM
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I imagin this thought experiment: a train which travels with the speed of light is trying to enter a tunel which has...
Sep9-07 03:30 PM
Doc Al
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I'm reading the relativistic mechanics chapter, of Hestenes' New Foundations for Classical Mechanics. After the...
Jun12-08 05:21 PM
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Consider the Schwarzschild blackhole vaccuum solution. Now let a test particle drop from "coordinate rest" at a...
Feb8-09 12:56 AM
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Dear esteemed physicists :) I've been trying to satisfy my own curiosity by proving relativistic Doppler using only...
Dec27-04 11:00 PM
Andrew Mason
7 2,006
This is probably a repeat question from somone somewhere, but here goes. Please fill in the blanks. I don't need a...
Jul30-09 04:14 PM
22 2,006
Einstein's equivalence principle states that free-falling observers are in local inertial frame, so one can construct...
Nov3-10 01:05 PM
11 2,006
Probably this has an easy answer but I can't see it just now, according to the principle of relativity we shouldn't be...
Jan21-11 10:52 AM
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According to Hawking Radiation, a black hole if left alone will eventually evaporate. As the black hole loses mass the...
Mar9-12 10:04 AM
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Ok so im just a layman that reads too much and understands too little, but I was hoping someone could help me out with...
Dec28-09 06:33 PM
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Can someone tell me what the numerical value for the entropy of a black hole of five solar masses would be? Is it a...
Aug6-04 08:21 AM
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I'm familiar with how one foliates, say, a four-dimensional spacetime (\mathcal{M},g) so that one can identify it as a...
Dec20-06 02:04 AM
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In the Schwarzschild solution consider two test point particles, p1 and p2, both at the same distance from the black...
Jun3-10 11:43 AM
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Is Gravity a Force of Attraction? We are familiar with electromagnetic attraction and we understand how and why it...
Dec18-04 07:11 PM
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In physics questions, objects are shown to travel at relativistic speeds, like 0.6c or 0.8c. This is all hypothetical,...
Apr21-09 01:53 PM
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i am a master's student and want to work on general relativity! does anybody have information on the most recent...
Oct30-07 08:53 AM
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Roger Penrose is reported to have said: And I understand that, in Minkowski space-time, the relative velocity...
Nov29-09 03:01 AM
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Synchronising clocks Referring to fig 1 I want to synchronise two clocks. I have a space ship travelling at v...
Apr17-08 05:37 PM
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All right. So, given that the speed of light varies in a gravitational field, Why, then, does the Michelson-Morley...
Jun10-04 07:00 PM
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:confused: I am sooo intrigued. The speed of light is independent to the speed of the observer. Why?????? I dont...
Aug24-05 02:59 PM
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Hello, does anybody know a proof of the equivalence (or differences) between the "total mass" integral \int T_munu...
Oct29-07 06:16 AM
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