1. 
   Ehrenfest Paradox
   The special relativistic 'paradox' involving a rapidly rotating disc. Since any radial segment of the disc is perpendicular to the direction of motion, there should be no length contraction of the radius; however, since the circumference of the disc is parallel to the direction of motion, it should ...
   Found op http://www.diracdelta.co.uk/science/source/e/h/ehrenfest%20paradox/source.h
   
   
2. 
   Ehrenfest paradox
   The Ehrenfest paradox concerns the rotation of a "rigid" disc in the theory of relativity. In its original formulation as presented by Paul Ehrenfest 1909 in the Physikalische Zeitschrift, it discusses an ideally rigid cylinder that is made to rotate about its axis of symmetry. The radius R as seen...
   Found op http://en.wikipedia.org/wiki/Ehrenfest_paradox
   
   

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