Physics (5th Edition)
5th Edition
ISBN: 9780321976444
Author: James S. Walker
Publisher: PEARSON
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Textbook Question
Chapter 5, Problem 19CQ
If you step off a high board and drop to the water below, you plunge into the water without injury. On the other hand, if you were to drop the same distance onto solid ground, you might break a leg. Use Newton s laws to explain the difference.
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A farmer is using a rope and pulley to lift a bucket of water from the bottom of a well that is h, = 9.5 m deep. The farmer
uses a force F,= 51 N to pull the bucket of water directly upwards. The total mass of the bucket of water is m; + m, = 3.7 kg.
Part (a) Select the correct free body diagram.
mg
m„gf F
mg'm,g
m„g
m,g
F
m„gTm,g
F
m,g
F,
m„gY m,g
m,g
Submit
Hint
Feedback
I give up!
-Draw your own free body diagram and compare it to the ones listed.
|-What forces are acting up, what forces are acting vertically down?
Part (b) Calculate how much work Wrin J the farmer does on the bucket of water (via the rope) to raise it to ground level.
W,= 484.5
/ Correct!
Part (c) Calculate how much work W, in J gravity does on the bucket filled with water as the farmer lifts it up the well.
W,=- 206.1
W. = -206.1
Part (d) Calculate the net work Wnet in J done on the bucket of water by the two forces F1 and Fg.
Wner = 278.37
Wner = 278.4
Feedback: The answer provided was not correct. We have…
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"
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Chapter 5 Solutions
Physics (5th Edition)
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