Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 7 - Kinetic Energy and Work - Problems - Page 175: 70c

Answer

15 N

Work Step by Step

$W=-18\,J \implies\vec{F}\cdot\vec{d}= -18\,J$ $\implies F_{x}d_{x}+F_{y}d_{y}+F_{z}d_{z}=-18\,J$ $\implies (4.0\,N\times3.0\,m)+(c\times-2.0\,m)+(0\times0)=-18\,J$ $\implies 12\,J+(c\times-2.0\,m)= -18\,J$ $\implies (-2.0\,m\times c)= -18\,J-12\,J$ Or $c=\frac{-30.\,J}{-2.0\,m}=15\,N$
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