Chapter 12: Q. 24 (page 331)
An object's moment of inertia is . Its angular velocity in increasing at the rate of per second. What is the net torque on the object?
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The 3.0-m-long, 100 kg rigid beam of FIGURE EX12.31 is supported at each end. An 80 kg student stands 2.0 m from support 1. How much upward force does each support exert on the beam?
In FIGURE EX12.19, what magnitude force provides net torque about the axle?
An 18-cm-long bicycle crank arm, with a pedal at one end, is attached to a 20-cm-diameter sprocket, the toothed disk around which the chain moves. A cyclist riding this bike increases her pedaling rate from 60rpm to 90 rpm in 10s .
a. What is the tangential acceleration of the pedal?
b. What length of chain passes over the top of the sprocket during this interval?
What is the moment of inertia of a 2.0 kg, 20-cm-diameter disk for rotation about an axis
(a) through the center, and
(b) through the edge of the disk?
The marble rolls down the track shown in FIGURE P12.75 and around a loop-the-loop of radius R. The marble has mass m and radius r. What minimum height h must the track have for the marble to make it around the loop-the-loop without falling off?
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