Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 4 - Dynamics: Newton's Laws of Motion - Problems: 2

Answer

670 N, 120 N, 250 N, 0 N.

Work Step by Step

In all cases, the weight is mg, where g is the local acceleration due to gravity. Answers are rounded to 2 significant figures. a. $$W_{Earth}=mg=(68 kg)(9.8 \frac{m}{s^{2}}) \approx 670 N$$ b. $$W_{moon}=mg=(68 kg)(1.7 \frac{m}{s^{2}}) \approx 120 N$$ c. $$W_{Mars}=mg=(68 kg)(3.7 \frac{m}{s^{2}}) \approx 250 N$$ d. $$W_{space}=mg=(68 kg)(0 \frac{m}{s^{2}}) = 0 N$$
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