University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 4 - Newton's Laws of Motion - Problems - Exercises - Page 128: 4.59


Choice A.

Work Step by Step

All parts of the dancer are in free fall, and have the same downward acceleration. Her head and her neck have the same downward acceleration, produced by gravity. Her neck does not exert any upward supporting force on her head. In other words, the weight of her head is mg, and it is accelerating with magnitude g, so mg is the net force. The neck exerts zero force on her head.
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