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Experimental verification of Ehrenfest Paradox

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d3mm
#1
Nov14-12, 07:06 PM
P: 139
I am not completely convinced that the modern resolution is correct.

Is it?

Is anyone aware of any experiments that have been done that relate to this effect?

Reference: http://en.wikipedia.org/wiki/Ehrenfest_paradox
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harrylin
#2
Nov15-12, 03:50 AM
P: 3,185
Hi, this topic has been well discussed before (and despite some confusion in the literature it never really was a paradox), see:

- http://www.physicsforums.com/showpos...53&postcount=5

- The original paper simply proves that according to SR real matter cannot be totally rigid (and there is nothing paradoxical about that):
http://en.wikisource.org/wiki/Unifor..._of_Relativity

PS. A short answer about experiments: it is very difficult to imagine an experiment that could allow to verify the contraction of a spinning disc. The inertial effect is always much greater and already not-so-fast rotating discs disintegrate (explode).
A.T.
#3
Nov15-12, 05:59 AM
P: 3,927
Quote Quote by harrylin View Post
PS. A short answer about experiments: it is very difficult to imagine an experiment that could allow to verify the contraction of a spinning disc. The inertial effect is always much greater and already not-so-fast rotating discs disintegrate (explode).
A spinning disc cannot contract much because the radial direction is not contracting. A spinning ring could potentially contract if it was very light (minimal centrifugal forces) and very strong. But I doubt an experiment is feasible with known materials.

harrylin
#4
Nov15-12, 06:07 AM
P: 3,185
Experimental verification of Ehrenfest Paradox

Quote Quote by A.T. View Post
A spinning disc cannot contract much because the radial direction is not contracting. [..] A spinning ring could potentially contract if it was very light [..].
I suspect that a very thin ring of any known useable material would still expand, but I did not calculate it (anyone?).


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