Physics (5th Edition)
5th Edition
ISBN: 9780321976444
Author: James S. Walker
Publisher: PEARSON
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Textbook Question
Chapter 5, Problem 14PCE
The Ux-versus-time graph for a 1.8-kg object is shown in Figure 5-28. A single force acts on the object and the force has only an x component. What is F, at (a) t = 0.50 s, (b) t = 2.0 s, and (c) t = 4.0 s?
Figure 5-28 Problem 14
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Beginning at time t = 0, a student exerts a horizontal force on a box of mass 30 kg, causing it to move at 1.2 m/s toward an elevator door located 16 m away, as shown above. The coefficient of kinetic friction uk between the box and the floor is 0.20.
At t = 4.0 s, the elevator door opens and remains open for 5.0 s. The student immediately exerts a larger constant force on the box and the front of the box reaches the elevator door just as it starts to close.
(c) Calculate the magnitude of the new force that the student exerts.
Suppose the roller-coaster car in the figure passes
32 m/
Part A
2
point 1 with a speed of 1.30 m/s.
V2
3
4
μA
If the average force of friction is equal to 0.15 of
its weight, with what speed will it reach point 2?
The distance traveled is 41 m.
Value
Units
Express your answer to two significant figures
and include the appropriate units.
26 m
14 m
B
?
Beginning at time t = 0, a student exerts a horizontal force on a box of mass 30 kg, causing it to move at 1.2 m/s toward an elevator door located 16 m away, as shown above. The coefficient of kinetic friction uk between the box and the floor is 0.20.
At t = 4.0 s, the elevator door opens and remains open for 5.0 s. The student immediately exerts a larger constant force on the box and the front of the box reaches the elevator door just as it starts to close.
(d) On the axes below, sketch graphs of the acceleration a, velocity v, and position x of the box versus time t between t = 0 and the time the front of the box reaches the elevator.
Chapter 5 Solutions
Physics (5th Edition)
Ch. 5.1 - Two forces have magnitudes F1 and F2. If these...Ch. 5.2 - Which of the following statements is correct? A: A...Ch. 5.3 - The acceleration of an object has a magnitude a....Ch. 5.4 - A force F pushes on three boxes that slide without...Ch. 5.5 - An object is acted on by a single force that is at...Ch. 5.6 - When a certain person steps onto a scale on solid...Ch. 5.7 - Figure 5-23 shows four identical bricks that are...Ch. 5 - Driving down the road, you hit the brakes...Ch. 5 - Youve probably seen pictures of someone pulling a...Ch. 5 - As you read this, you are most likely sitting...
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