2. A winch is a mechanical lifting or hauling device consisting of a rope, cable, or chain winding around a horizontal rotating drum, turned by a crank or by motor or other power source. We use one at our cottage to move heavy things like fallen trees. a) A motor on an electric winch is only 45% efficient. How much work must be done to winch a 200 kg load of bricks up 4 floors on a construction site if each floor is 4.0 m? b) What power must the motor generate to accomplish this in 42 s?

2. A winch is a mechanical lifting or hauling device consisting of a rope, cable, or chain winding around a horizontal rotating drum, turned by a crank or by motor or other power source. We use one at our cottage to move heavy things like fallen trees. a) A motor on an electric winch is only 45% efficient. How much work must be done to winch a 200 kg load of bricks up 4 floors on a construction site if each floor is 4.0 m? b) What power must the motor generate to accomplish this in 42 s?

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter23: Faraday’s Law And Inductance

Section23.2: Motional Emf

Problem 23.4QQ

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Concept explainers

Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.

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2. A winch is a mechanical lifting or hauling device consisting of a rope, cable, or chain
winding around a horizontal rotating drum, turned by a crank or by motor or other
power source. We use one at our cottage to move heavy things like fallen trees.
a) A motor on an electric winch is only 45% efficient. How much work must be done
to winch a 200 kg load of bricks up 4 floors on a construction site if each floor is 4.0 m?
b) What power must the motor generate to accomplish this in 42 s?
100 F

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