College Physics: A Strategic Approach (4th Edition)
4th Edition
ISBN: 9780134704180
Author: Knight
Publisher: PEARSON
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Chapter 10, Problem 98MSPP
Work and Power in Cycling
When you ride a bicycle at constant speed, almost all of the energy you expend goes into the work you do against the drag force of the air. In this problem, assume that all of the energy expended goes into working against drag. As we saw in Section 5.7, the drag force on an object is approximately proportional to the square of its speed with respect to the air. For this problem, assume that F α v2 exactly and that the air is motionless with respect to the ground unless noted otherwise. Suppose a cyclist and her bicycle have a combined mass of 60 kg and she is cycling along at a speed of 5 m/s.
89. How much power does she expend when cycling at that speed?
A. 100 w
B. 200 W
C. 400 W
D. 1000 W
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Chapter 10 Solutions
College Physics: A Strategic Approach (4th Edition)
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