Answer
270 N
Work Step by Step
Crate starts to move after the horizontal force exerted becomes equal to the maximum kinetic friction.
$f_{{s}_{max}}= \mu_{s}N$$=\mu_{s}mg= 0.69\times40\,kg\times9.8\,m/s^{2}$$=270\,N$
College Physics (7th Edition)
by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo
Published by
Pearson
ISBN 10:
0-32160-183-1
ISBN 13:
978-0-32160-183-4
Chapter 4 - Force and Motion - Learning Path Questions and Exercises - Exercises - Page 138: 65
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