Physics: Principles with Applications (7th Edition)

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

Chapter 2 - Describing Motion: Kinematics in One Dimension - Problems: 6

Answer

a) 300 m/s. b) 1 km every 3 seconds.

Work Step by Step

a. The rule of thumb estimates the speed of sound as 1 mile per 5 seconds. Convert: $$\frac{1 mile}{5 s} \frac{1610 m}{mile}= 322 m/s$$ To one significant figure, that is $300 m/s$. b. We see that sound would take roughly 3 seconds to travel about 1000 m, which is a km. The rule could be phrased as 1 km in 3 seconds.
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