EBK PHYSICS
5th Edition
ISBN: 8220103026918
Author: Walker
Publisher: PEARSON
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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…
In the figure, is the tension in the rope between the
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A. Jimmy: "Yes, of course it is the same. It's a single rope with a
single tension force on both ends. Booyah!"
B. Emmy: "I think they are different. The tension in the space
between Superhero and Trusty Sidekick only has to hold up Trusty
Sidekick, but the tension above Superhero has to hold up both
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ends' for the space between Superhero and Trusty Sidekick?
Wouldn't that only work if they had two different ropes? Or if the
rope breaks? The rope clearly holds, so the tension force must be
the same everywhere along the rope.
"
D
Figure 438 Superhers and Tunty Sickick hang mess on a pe
as they try to figure out what to do next Will the tension the the same
everywhere in the p
As a rocket ascends, its acceleration increases even though the net force on it stays constant. Why? (Assume a traveling distance small enough that the thrust, acceleration due to gravity and atmosphere do not change.)
As the rocket ascends, fuel is burned at a faster rate resulting in a larger acceleration.The rocket's mass decreases as its fuel is consumed. The same net force acting on a smaller mass results in a larger acceleration. The faster a rocket moves the more acceleration is imparted to it from a given force.As a rocket ascends its momentum increases with its speed. The greater the momentum of the rocket, the greater the acceleration imparted to it from a given force.
Chapter 5 Solutions
EBK PHYSICS
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