You are standing on the Earth and observe a spacecraft speeding by with your professor on board.

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You are standing on the Earth and observe a spacecraft speeding by with your professor on board.
(a) If both you and your professor are observing your wristwatch, who is measuring the proper time?
(b) Who measures the proper length of the spacecraft?
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College Physics

ISBN: 978-0321601834

7th edition

Authors: Jerry D. Wilson, Anthony J. Buffa, Bo Lou

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