Physics (10th Edition)

Published by Wiley
ISBN 10: 1118486897
ISBN 13: 978-1-11848-689-4

Chapter 10 - Simple Harmonic Motion and Elasticity - Problems - Page 274: 2

Answer

a) $k=30N/m$ b) $W=9N$

Work Step by Step

When the 4.5-N block is hung from the spring, the length the spring stretches is $x_1=35-20=15cm=0.15m$, and when the unknown block is hung from the spring, the length the spring stretches is $x_2=50-20=30cm=0.3m$ a) The spring constant is $$W=F_x=kx$$ $$k=\frac{4.5N}{x_1}=30N/m$$ b) The weight of the unknown block is $$W=kx_2=9N$$
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