Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

Published by Pearson
ISBN 10: 0321740904
ISBN 13: 978-0-32174-090-8

Chapter 6 - Dynamics I: Motion Along a Line - Exercises and Problems: 5

Answer

The magnitude of the normal force of the roof on the worker is 799 N

Work Step by Step

The magnitude of the normal force of the roof on the worker is equal to the component of the worker's weight which points perpendicular to the slope of the roof. Therefore; $F_N = mg~cos(\theta)$ $F_N = (850~N)~cos(20^{\circ})$ $F_N = 799~N$ The magnitude of the normal force of the roof on the worker is 799 N.
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