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Chapter 12: Q. 20 (page 331)
The 20-cm-diameter disk in FIGURE EX12.20 can rotate on an axle through its center. What is the net torque about the axle?
The net torque on the axle is , the direction is clockwise.
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14. II The four masses shown in FIGURE EX12.13 are connected by massless, rigid rods.
a. Find the coordinates of the center of mass.
b. Find the moment of inertia about a diagonal axis that passes through masses B and D.
The two blocks in FIGURE CP12.86 are connected by a massless rope that passes over a pulley. The pulley is 12 cm in diameter and has a mass of 2.0 kg. As the pulley turns, friction at the axle exerts a torque of magnitude 0.50 N m. If the blocks are released from rest, how long does it take the 4.0 kg block to reach the floor?
A ceiling fan with 80 cm-diameter blades is turning at 60 rpm. Suppose the fan coasts to a stop 25s after being turned off.
An object whose moment of inertia is experiences the torque shown in FIGURE EX12.25. What is the object's angular velocity at ? Assume it starts from rest.
What are the magnitude and direction of the angular momentum relative to the origin of the particle
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