College Physics
2nd Edition
ISBN: 9780134601823
Author: ETKINA, Eugenia, Planinšič, G. (gorazd), Van Heuvelen, Alan
Publisher: Pearson,
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Textbook Question
Chapter 3, Problem 20P
* You record the displacement of an object as a constant force is exerted on it. (a) If the time interval during which the force is exerted doubles, how does the object's displacement change? Indicate all the assumptions that you made. (b) Explain how your answer changes if one of the assumptions is not valid.
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A brick of mass m = 78 kg slides along a horizontal surface. The coefficient of friction between the brick and the surface is μk = 0.23. The brick has an initial speed of vo = 29 m/s in the positive x-direction as shown.
a.) Write an expression for the x-component of the frictional force the brick experiences, Ff, in terms of the given variables and variables available in the palette.
b.) What is the magnitude of the frictional force in N?
c.) How far will the brick travel, in meters, before coming to rest?
Current Attempt in Progress
A student (m = 58 kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of
0.04 s. The average force exerted on him by the ground is +18000 N, where the upward direction is taken to be the positive direction.
From what height did the student fall? Assume that the only force acting on him during the collision is that due to the ground.
H= i
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Chapter 3 Solutions
College Physics
Ch. 3 - Review Question 3.1 How do we determine how many...Ch. 3 - Review Question 3.2 A book bag hanging from a...Ch. 3 - Review Question 3.3 An elevator in a tall office...Ch. 3 - Review Question 3.4 What is the main difference...Ch. 3 - Review Question 3.5 Your friend says that m is a...Ch. 3 - Review Question 3.6 Newton’s second law says that...Ch. 3 - Review Question 3.7 Three friends argue about the...Ch. 3 - Review Question 3.8 Is the following sentence...Ch. 3 - Review Question 3.9 Explain how an air bag and...Ch. 3 - An upward-moving elevator slows to a stop as it...
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