Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 5, Problem 6P
(a)
To determine
To Calculate: The minimum horizontal force required to move the block if the block is being pressed into the surface.
(b)
To determine
To Calculate: The minimum horizontal force required to move the block if the block is partially supported by a vertical string under tension.
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A bedroom bureau with a mass of 45 kg, including drawers and clothing, rests on the floor. (a) If the coefficient of static friction between the bureau and the floor is 0.45, what is the magnitude of the minimum horizontal force that a person must apply to start the bureau moving? (b) If the drawers and clothing, with 17 kg mass, are removed before the bureau is pushed, what is the new minimum magnitude?
Logs weighing 1.3 kg and 2.2 kg lie on a flat surface and are connected by a rope that breaks at a force of 20 N. The coefficient of friction between the lighter log and the base is 0.50, and between the heavier log and the base 0.30. With what maximum force can we pull the lighter log so that the string does not break?
An initially stationary box of sand is to be pulled across a floor by means of a cable in which the tension should not exceed 1170 N. The coefficient of static friction between the box and the floor is 0.400. (a) What should be the angle between the cable and the horizontal in order to pull the greatest possible amount of sand, and (b) what is the weight of the sand and box in that situation?
Chapter 5 Solutions
Physics Fundamentals
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