ll motor draws 120 J of electrical energy from the mains to lift a book of mass 1 kg through a vertical distance of 8.0 m. It takes 5 s to do this. Calculate: (a) the power input to the motor; (b) the work done by the motor in lifting the book; (c) the fraction of the input power that is wasted

ll motor draws 120 J of electrical energy from the mains to lift a book of mass 1 kg through a vertical distance of 8.0 m. It takes 5 s to do this. Calculate: (a) the power input to the motor; (b) the work done by the motor in lifting the book; (c) the fraction of the input power that is wasted

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter7: Work, Energy, And Energy Resources

Section: Chapter Questions

Problem 33PE: What is the cost of operating a 3.00-W electric clock for a year if the cost of electricity is...

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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.

Question

A small motor draws 120 J of electrical energy from the mains to lift a book of mass 1 kg through a vertical distance of 8.0 m. It takes 5 s to do this.

Calculate:

(a) the power input to the motor;

(b) the work done by the motor in lifting the book;

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Step 1: Given parameters and a) finding input power to motor

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Step 3: c) Finding fraction of input power wasted

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