Relativity

Two ships Va and Vb are approaching each other at some relatiove velocity Vrel. The ships will pass each oither 100 meters apart. Hoiw can one determine if she is moving or at rest and or what part of Vrel does each frame own? As the ships are about to pass each directs a momentum stone poerpendiclar to her particlular frame aiming at a flat area on the other ship. Thje momentum stone and the flat areas are essentially golf balls and golf ball materials (flats). Case 1. Va is at rest Vb has all the motion. As The Va stone strikes the flat area on Vb the surface if Vb will impart a momentum impulse to the stone in the general direction of Vb. The Vb stone dire…

For the last couple of decades c has been considered as the ultimate speed limit. Until tachyons and gravitons came into the picture.

Since it seems that this month(well, September anyway) is dedicated to Einstein by at least several of the Pop Sci magazines, I've just picked up a copy of SciAm and Discover as they talk about him quite extensively. One thing I came to pretty quick was a mention of Violation(s) to Relativity, and something that I'd like to get more examples. What can be considered a Violation of either the Special Theory of Relativity as well as the possible violations to the General Theory of Relativity? I'm looking for examples really, like traveling faster than C, etc, but any further elaboration is welcome.

I thought about a ship leaving the earth with a camera at the front that maintains a constant broadcast back to earth. Hypothetically, if that ship accelerated to the speed of light quickly, what would happen? I would have thought that irrespective of the speed of the ship, the video broadcast should travel back to earth at the speed of light. But I suppose what confuses me is what happens if the camera is permanently on, does it allow you to get an image of alpha centaury faster than a ship that turns its camera on when it gets there? For example: A ship is sent to alpha centaury at the speed of light. When it gets there, it takes a photo and sends it back to …

I have read that when a body comes closeto the speed of light it undergoes a change in mass and its mass becomes infinite , well how is it possible wont it require infinite energy in order to attain infinite mass??...Please do correct me if a wrong awaiting your replies. thank you

So far no kind of string theory-under-construction or any approach to Quantum Gravity has offered an explanation for why there are visibly 3 spatial dimensions. If a theory has, say, 11 dimensions it will not explain why 7 remain rolled up out of sight and just 3 + 1 come out in plain view. Other Quantum Gravity approaches do not need extra (rolled up) dimensions but instead they work all right with just 3 + 1, or any number indiscriminately. They dont explain why it happens to be 3 + 1. So this is a problem that some smart people have been working on in QG. If we had a really good quantum theory of spacetime, they say, then it would explain not only gravit…

when relativity is quantized you get a bunch of plumbing connectors able to fit a new universe onto the bottom of a black hole. the bigbang and blackhole singularities (breakdowns of ordinary Relativity) go away and you get to connect the bottom of a black hole to the beginning of a new universe Leonardo Modesto "Disappearance of the Black Hole Singularity in Quantum Gravity" http://arxiv.org/gr-qc/0407097 So you get this monstrous plumbing nightmare Multiverse where a typical universe has millions of black holes form sometime during its history and each one of those buds off and makes a baby universe which then expands and has black holes of its own. A…

Looking for a quite place to put some thoughts and links about what's happening in the ongoing struggle to quantize relativity. As everybody knows, the prevailing theory of gravity is a geometrical theory called General Relativity where gravity is modeled by geometry. Gen Rel came out in 1915 and has been repeatedly tested since around 1919 and is doing fine. A satellite experiment to further test it, called Gravity Probe B, went up this year. Gen Rel is where ideas like bigbang, blackhole, darkenergy, cosmological constant, accelerating expansion, gravitational lensing (light bending) etc. come from. To quantize Gen Rel means to quantize geometry and, in eff…

i was woundering if some1 could help me understand about quantum entaglement i have found a hole lot of diffrent web sites but they give me a diffrent ideas if any1 can give me a good website and also any expermints that i could do @ home for a cheap price to help mr understand it would be good thanks

an episode of stargate sg-1 saw a black hole on the one side of the wormhole creating time dilations back on earth. if u were to have a similar, theoretical scenario of say, a circle draw on the ground, and inside the circle time was running slowly and outside it was normal, and u were to stick a pole into the circle, wat would happen? since, i gather, when u push a pole on one end, the other end moves because the particles push each other along at a certain speed (the reason y u can't have faster than light communication by making a pole between planets and pushing it), i would figure that within the circle the particles would b moving slower and outside they wo…

For anyone interested, I've just published a new book about the history of higher dimensions in physics. It chronicles the struggles by Einstein and others to pursue special and general relativity, then various attempts at a unified field theory of all known forces. It is full of interesting anecdotes, gathered from interviews with pioneering physicists such as John Wheeler and Bryce DeWitt. The book is called: The Great Beyond: Higher Dimensions, Parallel Universes and the Extraordinary Search for a Theory of Everything by Paul Halpern Here's a link for more information: http://www.amazon.com/exec/obidos/tg/detail/-/047146595X Thanks, Paul

Most of the following is culled from http://www.space.com, my favorite science page. This one of course being my second favorite. It appears that a 27 year old untrained theorist named Lynd has said some amazing things about time. I have heavily edited from the article. Goals never reached The most famous paradox invented by Zeno, the Greek philosopher, is called "Achilles and the tortoise." A tortoise gets a 10-meter head start in a race against Achilles. Zeno says the tortoise can never be passed. His logic: When Achilles has run 10 meters, the tortoise will have moved a meter; Achilles goes another meter, and the tortoise crawls 10 more centimeters. The…

Let's say there are two people floating towards each other in space at the same speed. Neither astronaut is experiencing any acceleration. They are both moving at 0.5c. I have two questions about what happens when they pass each other:' 1) Won't both astronauts measure the other ones speed at 1.0c? 2) Won't both astronauts see the other astronaut's watch ticking slower?

Chryssomalakos and Okon just posted this paper http://arxiv.org/hep-th/0407080 I think it has an important result that completes a major paper by Kowalski-Glikman and Smolin called Triply Special Relativity K-G and S show that you can jack relativity up to where 3 quantities are constant (same for all observers)----speed of light of course, that was the original circa 1900 modification, bending the square newtonian framework so that c is the same for all observers----but then you can further bend the symmetries so that two more quantities are invariant: a mass and a curvature Now C and O have shown that you cant jack it up any farther. What Kowalski-Gl…

I opened a web-site about subject above. See if you please. http://www.geocities.co.jp/Technopolis/2561/eng.html P.S. I can't receive E-mail. I haven't PC.

1. we know the speed of sound/light but do we know why it is that speed? 2. is the speed of light allways the same anywere? i know there cant be any sound in space so why does it not affect light? 3. speed of sound and light is found out by D=V*T (as in time 60s in a min 60 mins in a hr etc) but what if we are wrong what if there is 64s in a min cause our time scale is not right well i dont think it is cause every year is not allways the same cause of a leap year if so would that not **** up a few things? im a science newb so thats why im asking these questions so i might be talking a lot of shit please say to me "u dum ****" if needed

PROBLEM: The deviation angle of a photon passing by a simple black hole as described by the Schwarzschild-metric is given by [math] \delta = \frac{4M}{R} [/math] where R is the minimum r-coordinate of the trajectory´s points. This equation is derived as an approximation and I doubt it´s validity for small R a bit for reasons given below. STORY: I´m currently working on a numeric simulation about black holes to visualize some effects of GR. Within this scope I decided to test my results for light deviation against the predicted values. I discovered a huge difference between my values and the prediction: At distances R>100 (M=1 in my case, btw) the values loo…

Could someone tell me- 1) What is the speed of light measured by? 2) What possible factors did play an affect on how the light was measure? 3) Is there proof that nothing can travel faster than the speed of light? I ask this because I have done enough research to know how they did it. Yet I still have questions regarding on if people think that the tester speed was a factor into it or rather not. So do people believe that the speed of light is already scientifically proven or perhaps that their measurements may have been altered by the equipment they used.

Why does Einstein think that nothing is faster than light speed? I think this is the most important core of relativity, so I must have a clear concept. Hope for your helps

Well, i hope to ask experts in physics to tell me what is General Relativity? Relativity? and what is the ether? Erm, i tried finding it out but all i get is some mathematical equations which i don't have a clue about. Thanks P.S. I have no knowledge or whatsoever in physics.

Acording to the special theory of relativity you would, if you wanted to fly at the speed of light, to have to have an infinate mass, or if you were massless to start with there wouldnt be a problem. Can any body give me the formula (if complicated an explanation would be nice) that shows any body with a posative rest mass would have an infinite mass if moving at the speed of light?

The stressing of need for mathematical form in discussing relativity problems attracted my attention.. I have a question regarding Einstein's original moving train gedunken. Perhaps someone can help clear up something for me. Photons are emitted from A and B in a stationary frame, just as a moving observer M' arrives at M, the midpoint of A and B. M' is heading toward B, away from A. Later a photon from B is detected at M', then a photon from A is detected at M', in the moving frame. SR theory, as I understand, concludes that the photons emitted simultaneously from A and B in the stationaary frame are not emitted simultaneously in the moving frame. I accept that SR p…

what makes the speed of light equal in all the inertial frames? Is it assumed to be true, like an axiom of mathematics

Hello, I am a highschool student doing a project on Special relativity, and have done much research on the subject. Today, while reading through Albert Einsteins book, relativity: the special and general theory, i had a bit of a thought: One of the things covered in special relativity is that it is impossible to tell whether something is moving within a point of reference or whether the point of reference is moving. another thing it covers is time dialation, that the faster something moves, the slower time will progress for that body. Well, here is my thought: if i have two bodies in space, each one having chronograph identical to the other's chronograph, and the di…

The Revision of Special Relativity The following indictaes that that the simultaneity derivation from Specal Relativity postulates is fatally flawed. The experiment Clocks are positioned at A, M and B in a stationary inertial frame and at A’, M’ and B’ in an inertial frame moving along the AB line. M is the midpoint of photon sources located at A and B. When A’ = A, M’ = M and B’ = B, the clocks are set to zero (mechanically triggered) and photons are emitted from A and B. We assure ourselves of these positions long before the experiment takes place. We have plced A', M' and B' befoe accelerating this frame to a velocity such that v(A'B' = AB) = 1. When A' = A,…