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Home  arrow Chapter 8  arrow Practice Questions

Practice Questions



This activity contains 25 questions.

Question 1.
A wheel of radius 1 m is spinning with a constant angular velocity of 2 rad/s. What is the centripetal acceleration of a point on the wheel's rim?


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Question 2.
A wheel of radius .5 m is spinning with a constant angular velocity of 2 rad/s. What is the centripetal acceleration of a point on the wheel's rim?


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Question 3.
A non-zero net torque will


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Question 4.
A zero net torque


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Question 5.
An ice skater is in a spin with his arms outstretched. If he pulls in his arms, what happens to his rotational kinetic energy?


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Question 6.
Marilyn (M) and her twin sister Sheila (S) are riding on a merry-go-round revolving at a constant rate. Sheila is half way in from the edge, as shown (bird's-eye view).


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Question 7.

Marilyn (M) and her twin sister Sheila (S) are riding on a merry-go-round revolving at a constant rate. Sheila is half way in from the edge, as shown (bird's-eye view).

What is the relationship between Marilyn's and Sheila's angular acceleration?


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Question 8.

Marilyn (M) and her twin sister Sheila (S) are riding on a merry-go-round revolving at a constant rate. Sheila is half way in from the edge, as shown (bird's-eye view).

What is the relationship between the centripetal (radial) acceleration of the two sisters?


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Question 9.

Marilyn (M) and her twin sister Sheila (S) are riding on a merry-go-round revolving at a constant rate. Sheila is half way in from the edge, as shown (bird's-eye view).

What is the relationship between the angular momentum of the two sisters?


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Question 10.

Marilyn (M) and her twin sister Sheila (S) are riding on a merry-go-round revolving at a constant rate. Sheila is half way in from the edge, as shown (bird's-eye view).

What is the relationship between the rotational kinetic energy of the two sisters?


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Question 11.

The record player on the turntable of your stereo is rotating clockwise (as seen from above). After turning it off, your turntable is slowing down, but hasn't stopped yet. The direction of the acceleration of Point P (at the left) is


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Question 12.

Initially, a 2.00-kg mass is whirling at the end of a string (in a circular path of radius 0.750 m) on a horizontal frictionless surface with a tangential speed of 5 m/s. The string has been slowly winding around a vertical rod, and a few seconds later the length of the string has shortened to 0.250 m. What is the instantaneous speed of the mass at the moment the string reaches a length of 0.250 m?


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Question 13.

Initially, a 2.00-kg mass is whirling at the end of a string (in a circular path of radius 0.750 m) on a horizontal frictionless surface with a tangential speed of 5 m/s. The string has been slowly winding around a vertical rod, and a few seconds later the length of the string has shortened to 0.250 m. What is the initial centripetal acceleration of the mass?


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Question 14.

Initially, a 2.00-kg mass is whirling at the end of a string (in a circular path of radius 0.750 m) on a horizontal frictionless surface with a tangential speed of 5 m/s. The string has been slowly winding around a vertical rod, and a few seconds later the length of the string has shortened to 0.250 m. What is the final centripetal acceleration of the mass?


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Question 15.

The three 'point' 1 kg masses in the figure are at (x,y) = (0,0),(4,3), and (8,0), respectively. What is the rotational inertia about an axis perpendicular to the figure and through the mass in the lower left hand corner?


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Question 16.

The three 'point' 1 kg masses in the figure are at (x,y) = (0,0),(4,3), and (8,0), respectively. What is the rotational inertia of the masses in the figure about an axis perpendicular to the figure and through the point half way between the two lower masses at (x,y) = (4,0)?


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Question 17.

The three 'point' 1 kg masses in the figure are at (x,y) = (0,0),(4,3), and (8,0), respectively. What is the rotational inertia of the masses about the x axis?


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Question 18.

The three 'point' 1 kg masses in the figure are at (x,y) = (0,0),(4,3), and (8,0), respectively. What is the rotational inertia of the masses about the y axis?


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Question 19.
A bicycle is travelling North. The direction of the angular momentum vector of its front wheel is


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Question 20.
( w is the angular velocity, t is the torque, a is the angular acceleration, I is the rotational inertia, and L the angular momentum.)
Given the above definitions, F is to t as _______ is to I.


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Question 21.
What is the magnitude of the torque exerted by the F1 force on the door?


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Question 22.
What is the magnitude of the torque exerted by the F2 force on the door?

 
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Question 23.
What is the magnitude of the torque exerted by the F3 force on the door ?


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Question 24.
What is the magnitude of the torque exerted by the F4 force on the door?


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Question 25.
What is the magnitude of the torque exerted by the F5 force on the door?


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