College Physics (4th Edition)

Published by McGraw-Hill Education
ISBN 10: 0073512141
ISBN 13: 978-0-07351-214-3

Chapter 2 - Problems - Page 69: 87

Answer

The reading on spring scale A is 120 N. The reading on spring scale B is 240 N.

Work Step by Step

The rope attached to the weight is holding up a weight of 120 N, so the tension in the whole rope must be 120 N. Therefore, the reading on spring scale A is 120 N. The pulley is being pulled down on each side by a tension of 120 N, for a total force of 240 N. Then the rope pulling up on the pulley must have a tension of 240 N. Therefore, the reading on spring scale B is 240 N.
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