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Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
6
Work and Energy
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6-1: Work, Constant Force
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6-2: Work, Varying Force
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6-3: Kinetic Energy; Work-Energy Principle
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6-4 and 6-5: Potential Energy
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6-6 and 6-7: Conservation of Mechanical Energy
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6-8 and 6-9: Law of Conservation of Energy
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6-10: Power
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Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 1
Q

A 75.0-kg firefighter climbs a flight of stairs 28.0 m high. How much work does he do?

A
2.06×104 J2.06 \times 10^4 \textrm{ J}
Giancoli 7th Edition, Chapter 6, Problem 1 solution video poster
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VIDEO TRANSCRIPT

This is Giancoli Answers with Mr. Dychko. The work done by the firefighter is the force he exerts in order to climb the stairs times the vertical height of the stairs. And you have to assume that they are going at constant speed or exterting the minimum force needed, in which case, the force will be equal to his weight which is mg. So we have 75 kilograms times 9.8 newtons per kilogram, to get the weight, times 28 meters— height of the stairs, which is 2.06 times 10 to the 4 joules of work done.

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Giancoli Answers, including solutions and videos, is copyright © 2009-2024 Shaun Dychko, Vancouver, BC, Canada. Giancoli Answers is not affiliated with the textbook publisher. Book covers, titles, and author names appear for reference purposes only and are the property of their respective owners. Giancoli Answers is your best source for the 7th and 6th edition Giancoli physics solutions.