Chapter 07, Problem 055 A horse pulls a cart with a force of 78 lb at an angle o

Question

Chapter 07, Problem 055 A horse pulls a cart with a force of 78 lb at an angle of 41. above the horizontal and moves along at a speed of 1.o mWh. (a How much work does the force do in 8.8 min? (b) What is the average power of the force? (a) Number Units (b) Number Units HINT LINK TO SAMPLE PROBLEM LINK TO SAMPLE PROBLEM VIDEO MINI-LECTURE VIDEO MINI-LECTURE y accessing this Question Assistance, you will learn while you earn points based on the Point potential Policy set by your instructor. Question Attempts: o of 3 used SAVE FOR LATER yright 2000-2017 by John Wiley & Sons, Inc or reiated companies. All rights reserved. l 2000-2012 lohn Wile & Sons Inc. All Rights Reserved. A Division of 2ehn Wiley & Sons, unca Version 4.22.2 ared assign uniaN 1009

Explanation / Answer

F = 78 lb

v = 1 mi/hr

time = 8.8 min

==> distance = v*t = 1 mil/hr *8.8 min = 8.8/60 miles

theta = 41 degrees

A ) Work = F*S*Cos(theta) = 78 * (8.8/60) * cos(41 degrees) = 8.6338 lb-mile

B) Power = F*V*Cos(theta) = 78 * 1 * cos(41 degrees) = 58.86 lb-mile/hr

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