A 1,000W motor powers a hoist used to lift cars at a service station. a. How much time would it take to raise a 1,500kg car 2m? b. If the original motor is replaced with one rated at 2,000W, how long would it take to complete this task?

A 1,000W motor powers a hoist used to lift cars at a service station. a. How much time would it take to raise a 1,500kg car 2m? b. If the original motor is replaced with one rated at 2,000W, how long would it take to complete this task?

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter10: Work, Energy And Machines

Section10.1: Work And Energy

Problem 20SSC

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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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A 1,000W motor powers a hoist used to lift cars at a service station.

a. How much time would it take to raise a 1,500kg car 2m?

b. If the original motor is replaced with one rated at 2,000W, how long would it take to complete this task?

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