University Physics Volume 1
18th Edition
ISBN: 9781938168277
Author: William Moebs, Samuel J. Ling, Jeff Sanny
Publisher: OpenStax - Rice University
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Textbook Question
Chapter 5, Problem 75AP
Draw a free-body diagram of a diver who has entered the water, moved downward, and is acted on by an upward force due to the water which balances the weight (that is, the diver is suspended).
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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
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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…
A person in a kayak starts paddling, and it accelerates from 0 to 0.8 mile/hour in adistance of 0.8km. If the combined mass of the person and the kayak is 80kg, whatis the magnitude of the net force acting on the kayak?
You’re exploring a cave. Standing in a low cavern, you steady yourself by pushing straight up on the rock ceiling. Identify the forces acting on you.
Chapter 5 Solutions
University Physics Volume 1
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