4th Edition

ISBN: 9780134700427

Author: Knight

Publisher: PEARSON

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Textbook Question

Chapter 10, Problem 95MSPP

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.

86. lf the drag force on the cyclist is 10 N, how much energy does she use in cycling 1 km?

A. 6 kJ

B. 10 kJ

C. 50 kJ

D.100kJ

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Chapter 10, Problem 94MSPP

Chapter 10, Problem 96MSPP

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COLLEGE PHYSICS - LCPO

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