A mover lowers a piano weighing 200.0 kg using the pulley system in the diagram below. Assume that the piano is initially 2 m from the ground. a) How much work does the mover have to do to slow down the piano's descent if it reaches a speed of 0.25 m/s at 1 m from the ground? b) Assuming that the mover exerts a constant force what is the modulus of this force? c) Deduce the piano's acceleration.

A mover lowers a piano weighing 200.0 kg using the pulley system in the diagram below. Assume that the piano is initially 2 m from the ground. a) How much work does the mover have to do to slow down the piano's descent if it reaches a speed of 0.25 m/s at 1 m from the ground? b) Assuming that the mover exerts a constant force what is the modulus of this force? c) Deduce the piano's acceleration.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter2: Matter And Energy

Section: Chapter Questions

Problem 21RQ

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