Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 9 - Think and Explain: 76

Answer

Please see Figure 9.21. When the Moon’s long axis points toward Earth, there is no torque because there is no lever arm; the force, acting on the CG, is right on the axis. This is similar to how a magnetic compass needle that is already aligned north-south feels no magnetic torque.
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