Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 9 - Section 9.2 - The Dot Product - 9.2 Exercises - Page 646: 45

Answer

16 ft-lbs

Work Step by Step

Given the force $F = 4i - 7j$ and $D = 4i$ The question asks for the work done in foot-pounds. Work is equal to the dot product of the Force Vectors and Distance Vectors $W = <4, 7> * <4, 0>$ $4 * 4 + 7 * 0$ $16 ft-lbs$
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