Answered: How much energy is used in 20 minutes…

How much energy is used in 20 minutes of listening to music on an mp3 player that uses 9 watts of power? (E=pt and 1 kWh = 3.6 million Joules) a. 1,200 J b. 10,800 J c. 18 J

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 19CQ: Explain, in terms of the definition of power, why energy consumption is sometimes listed in...

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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.

Question

28.) How much energy is used in 20 minutes of listening to music on an mp3 player that uses 9 watts of power? (E=pt and 1 kWh = 3.6 million Joules)

a. 1,200 J

b. 10,800 J

c. 18 J

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