Physics: Principles with Applications (7th Edition)

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

Chapter 9 - Static Equilibrium; Elasticity and Fracture - Questions - Page 250: 8

Answer

The meterstick and the rock have equal mass.

Work Step by Step

The meterstick’s CM is at the 50-cm mark. We can treat the weight of the meterstick as though its entire mass is concentrated there. The meterstick’s weight, applied 25 cm to the right of the pivot, balances the rock’s weight that is applied 25 cm to the left of the pivot. The masses are equal.
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