Giancoli's Physics: Principles with Applications, 7th Edition
6
Work and Energy
Change chapter6-1: Work, Constant Force
6-2: Work, Varying Force
6-3: Kinetic Energy; Work-Energy Principle
6-4 and 6-5: Potential Energy
6-6 and 6-7: Conservation of Mechanical Energy
6-8 and 6-9: Law of Conservation of Energy
6-10: Power
Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 68
Q
A ski area claims that its lifts can move 47,000 people per hour. If the average lift carries people about 200 m (vertically) higher, estimate the maximum total power needed.
A
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VIDEO TRANSCRIPT
This is Giancoli Answers with Mr. Dychko. We calculate the total mass of people that are moved in an hour and that's going to be 47,000 people times by approximately 75 kilograms per person and then multiply that by 9.8 newtons per kilogram and that gives us the amount of force, in total that's applied, times the 200 meters height to get the total work done in an hour. And then we divide it by that hour, expressed in seconds, 3600 seconds and we get about 2 megawatts of power needed by the chairlifts.
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