College Physics (4th Edition)

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

Chapter 2 - Problems - Page 70: 90

Answer

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

Work Step by Step

The hook on the ceiling is holding the system up, so it must be pulling up with a force of 120 N. The gravitational force on the apples is pulling down on the system with a force of 120 N. We can see that there is a tension of 120 N throughout the system. Therefore, the reading on spring scale A is 120 N and the reading on spring scale B is 120 N.
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