A rocket of proper length 40 m is observed to be 32 m long as it rushes past the earth. What is its speed relative to the earth?

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter9: Relativity
Section: Chapter Questions
Problem 59P: Spacecraft I, containing students taking a physics exam, approaches the Earth with a speed of 0.600c...
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A rocket of proper length 40 m is observed to be 32 m long as it rushes past the earth. What is its speed relative to the earth?

 

A relativistic conveyor belt is moving at speedrelative to frame S.Two observers standing beside the belt, 10 ft apart as measured in S, arrange that each will paint a mark on the belt at exactly the same instant (as measured in S). How far apart will the marks be as measured by observers on the belt?

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