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We found 2 dictionaries that define the word Ehrenfest paradox:

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  1. Ehrenfest paradox: Wikipedia, the Free Encyclopedia
  2. Ehrenfest paradox: Wiktionary

Definitions from Wiktionary (Ehrenfest paradox)

noun:  (physics) A relativistic paradox concerning the concept of Born rigidity within special relativity, where an ideally rigid cylinder that is made to rotate about its axis of symmetry. The radius R as seen in the laboratory frame is always perpendicular to its motion and should therefore be equal to its value R₀ when stationary. However, the circumference should appear Lorentz-contracted to a smaller value than at rest. This leads to the contradiction that R = R₀ and R < R₀.

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