AP Physics C Mechanics Unit – 5 – Rotation Practice Test
AP Physics C Mechanics Unit – 5 – Rotation Practice Test
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Question 1 of 18
1. Question
What is the rotational equivalent of mass?
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Question 2 of 18
2. Question
In rotational kinematics equations, what quantity is analogous to force in linear kinematics equations?
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Question 3 of 18
3. Question
A particle is moving at constant speed in a straight line past a fixed point in space, c. How does the angular momentum of the particle about the fixed point in space change as the particle moves from point a to point b?
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Question 4 of 18
4. Question
If the fulcrum of a balanced scale is shifted to the left, what type of adjustment must be made to rebalance the scale?
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Question 5 of 18
5. Question
A man sits on the end of a long uniform metal beam of length 3.05m. The man has a mass of 85kg and the beam has a mass of 40kg. What is the magnitude of the net torque on the plank about the secured end of the beam? Use gravity g=9.8 .
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Question 6 of 18
6. Question
Two children sit on the opposite sides of a seesaw at a playground, doing so in a way that causes the seesaw to balance perfectly horizontal. The 36kg child on the left is 1.8m from the pivot. What is the mass of the second child if she sits 2.4m from the pivot?
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Question 7 of 18
7. Question
An art sculpture comprised of a long hollow painted cylinder is designed to pivot about an axis located along its long edge. The cylinder has mass 234kg, radius 2.2m, and length 5.8m. Calculate the moment of inertia of the sculpture about this axis.
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Question 8 of 18
8. Question
A 2kg meter stick is secured at one end so that it is free to rotate in a vertical circle. It is held perfectly horizontally, and released. Calculate the instantaneous angular acceleration the moment it is released.
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Question 9 of 18
9. Question
Sarah spins a ball of mass m attached to a string of length r around her head with a velocity . If the ball splits in half, losing exactly onehalf of its mass instantaneously, what is its new velocity ?
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Question 10 of 18
10. Question
A mechanic is using a wrench to loosen and tighten screws on an engine block and wants to increase the amount of torque he puts on the screws to adjust them more easily. Which of the following steps will not help him to do so?
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Question 11 of 18
11. Question
An object starts from rest and accelerates to an angular velocity of 12 in three seconds under a constant torque of 50 N⋅m. How many revolutions has the object made in this time?
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Question 12 of 18
12. Question
A carousel—a horizontal rotating platform—of radius r is initially at rest, and then begins to accelerate constantly until it has reached an angular velocity ω after 2 complete revolutions. What is the angular acceleration of the carousel during this time?
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Question 13 of 18
13. Question
A solid sphere of mass m is fastened to another sphere of mass 2m by a thin rod with a length of 3x. The spheres have negligible size, and the rod has negligible mass. What is the moment of inertia of the system of spheres as the rod is rotated about the point located at position x, as shown?
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Question 14 of 18
14. Question
A rigid bar with a mass M and length L is free to rotate about a frictionless hinge at a wall. The bar has a moment of inertia I = ML² about the hinge, and is released from rest when it is in a horizontal position as shown. What is the instantaneous angular acceleration when the bar has swung down so that it makes an angle of 30° to the vertical?
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Question 15 of 18
15. Question
A horizontallymounted disk with moment of inertia I spins about a frictionless axle. At time t=0, the initial angular speed of the disk is ω. A constant torque τ is applied to the disk, causing it to come to a halt in time t. How much Power is required to dissipate the wheel’s energy during this time?
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Question 16 of 18
16. Question
A series of wrenches of different lengths is used on a hexagonal bolt, as shown below. Which combination of wrench length and Force applies the greatest torque to the bolt?
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Question 17 of 18
17. Question
A certain star, of mass m and radius r, is rotating with a rotational velocity ω. After the star collapses, it has the same mass but with a much smaller radius. Which statement below is true?
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Question 18 of 18
18. Question
A circular disk of radius 0.5m and mass 3kg has a force of 25N exerted perpendicular to its edge, causing it to spin. What is the angular acceleration of the disk?
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