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Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
26
Special Theory of Relativity
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26-4 and 26-5: Time Dilation, Length Contraction
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26-7: Relativistic Momentum
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26-9: Mass and Energy
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26-10: Relativistic Addition of Velocities
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Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 9
Q

A friend speeds by you in her spacecraft at a speed of 0.720c. It is measured in your frame to be 4.80 m long and 1.35 m high.

  1. What will be its length and height at rest?
  2. How many seconds elapsed on your friend’s watch when 20.0 s passed on yours?
  3. How fast did you appear to be traveling according to your friend?
  4. How many seconds elapsed on your watch when she saw 20.0 s pass on hers?
A
  1. 6.92 m6.92 \textrm{ m}
  2. 13.9 s13.9 \textrm{ s}
  3. 0.720c0.720c
  4. 13.9 s13.9 \textrm{ s}
Giancoli 7th Edition, Chapter 26, Problem 9 solution video poster
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