Question:

At what speed do the relativistic formulas for

- length and
- 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:

- $0.141c$
- 0.140c