Physics for Scientists and Engineers with Modern Physics, Technology Update
9th Edition
ISBN: 9781305401969
Author: SERWAY, Raymond A.; Jewett, John W.
Publisher: Cengage Learning
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Chapter 7, Problem 1OQ
To determine
The amount of work done by John and Alex.
Expert Solution & Answer
Answer to Problem 1OQ
Option (c) is correct. John does more work than Alex.
Explanation of Solution
Consider the speed of the carrier is negligible while it is lifted.
As Alex lifts his cabinet straight up from the ground to the bed of the truck work down by him is only due to gravitational potential energy of the cabinet.
While John slides his cabinet up a rough ramp to the truck he has to overcome friction force between the ramp and the cabinet and also gravitational potential energy of the cabinet.
So total work done by John is due to both energy due to friction and potential energy and work done by Alex is only due to gravitational energy.
Therefore, John does more work than Alex.
Conclusion:
John does more work than Alex. Thus, Option (c) is correct.
Alex and John do not do same amount of work as john does more work. Thus, Option (a) is incorrect.
Alex does more work than John is incorrect as Alex do not faces work done by friction on the cabinet. Thus, Option (b) is incorrect.
It is possible to determine who has done more work done without knowing the value of
The angle of the incline is not needed to determine who has done more work done. Thus, Option (e) is incorrect
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Chapter 7 Solutions
Physics for Scientists and Engineers with Modern Physics, Technology Update
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