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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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Problem 1: 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, + my = 3.7 kg.
Part (a) Select the correct free body diagram.
mg
m„gf F
mg'm,g
m„g
mg
F
m„gTm,g
F
m,g
F,
m„gY m,g
m,g
Submit
Hint
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Hints: 2 for a 0% deduction. Hints remaining: 0
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-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
X Attempts Remain
Part (d) Calculate the net work Wnet in J done on the bucket of water by…
Problem 1: 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, + my = 3.7 kg.
Part (a) Select the correct free body diagram.
m,gf F
m „g↑ F
mg'm,g
m „g
m,g
m „gTm,g
F
m,g
mwg
m„g Y m,g
Submit
Hint
Feedback
I give up!
» 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.
» 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.
Part (d) Calculate the net work Wnet in J done on the bucket of water by the two forces F, and F,.
In England in the Middle Ages an extensive system of canals was used for transportation. Some of
these canals crossed over canyons by flowing over bridges (viaducts). Suppose that a heavily
loaded barge crossed over such a waterway bridge.
A) The force on the barge would become less because some water would be squeezed off of the
bridge.
B) The force downward on the bridge would increase because of the added weight of the barge.
C) The force on the bridge would not change when the barge passed over.
D) The force on the bridge would become less because of the buoyancy effect of the water on the
barge.
E) Whether or not the force on the bridge would increase or decrease would depend on whether
the water was flowing or stationary.
Chapter 5 Solutions
University Physics Volume 1
Ch. 5 - Check Your Understanding Find the magnitude and...Ch. 5 - Check Your Understanding A skydiver opens his...Ch. 5 - Check Your Understanding At the time of its...Ch. 5 - Check Your Understanding A 550-kg sports car...Ch. 5 - Check Your Understanding A car gas forces acting...Ch. 5 - Check Your Understanding For Example 5.8, find the...Ch. 5 - Check Your Understanding Two blocks are at rest...Ch. 5 - Check Your Understanding A force of 1150 N acts...Ch. 5 - Check Your Understanding One end of a 3.0-m rope...Ch. 5 - Check Your Understanding (a) Draw the free-body...
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Their...Ch. 5 - A force of 1600 N acts parallel to a ramp to push...Ch. 5 - Draw a free-body diagram of a diver who has...Ch. 5 - For a swimmer who has just jumped off a diving...Ch. 5 - (a) Find an equation to determine the magnitude of...Ch. 5 - A sailboat has a mass of 1.50103kg and is acted on...Ch. 5 - Find the acceleration of the body of mass 10.0 kg...Ch. 5 - A body of mass 2.0 kg is moving along the x -axis...Ch. 5 - Force FBhas twice the magnitude of force FA. 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