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Experimental verification of Ehrenfest Paradox

  1. Nov 14, 2012 #1
    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
  2. jcsd
  3. Nov 15, 2012 #2
    Hi, this topic has been well discussed before (and despite some confusion in the literature it never really was a paradox), see:

    - https://www.physicsforums.com/showpost.php?p=4101753&postcount=5

    - The original paper simply proves that according to SR real matter cannot be totally rigid (and there is nothing paradoxical about that):

    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).
    Last edited: Nov 15, 2012
  4. Nov 15, 2012 #3


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    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.
  5. Nov 15, 2012 #4
    I suspect that a very thin ring of any known useable material would still expand, but I did not calculate it (anyone?).
    Last edited: Nov 15, 2012
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