Integrated Science
Integrated Science
7th Edition
ISBN: 9780077862602
Author: Tillery, Bill W.
Publisher: Mcgraw-hill,
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Chapter 4, Problem 5PEB

A 60.0 kg person will need to climb a 10.0 m stairway how many times to “work off” each excess Cal (kcal) consumed?

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As a box is lifted against gravity and placed on a shelf, how does the work done by the lifter compare with the work done by gravity?  What is the net work done on the box?  What does this imply about its change in kinetic energy?  Use definitions and mathematics from this chapter to answer these questions.
As I carry a box up a flight of stairs, am I doing positive work or negative work on the box? Provide a mathematical explanation.
As a ball falls under the influence of gravity, does gravity do positive work or negative work? Provide a mathematical explanation.
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