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Question: 

At what speed do the relativistic formulas for

  1. length and
  2. time intervals differ from classical values by 1.00%?

(This is a reasonable way to estimate when to use relativistic calculations rather than classical.)

Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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Quick Answer: 
  1. $0.141c$
  2. 0.140c

Giancoli 7th Edition, Chapter 26, Problem 7

(3:17)

Chapter 26, Problem 7 is solved.

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