Calculus: Early Transcendentals 8th Edition

Published by Cengage Learning
ISBN 10: 1285741552
ISBN 13: 978-1-28574-155-0

Chapter 12 - Section 12.4 - The Cross Product - 12.4 Exercises - Page 822: 40


(a) 40 ft-lb (b) 12 ft-lb

Work Step by Step

(a) Arm: $i+2j$ ft Force: $20 i$ lb $A \times F =-40 k$ $|A \times F|= $|$i+2j$||$20 i$|$=40 ft-lb$ (b) Arm: $0.6i+0.6j$ ft Force: $20 i$ lb $A \times F =-12 k$ $|A \times F|= $|$i+2j$||$20 i$|$=12 ft-lb$
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