The two objects in FIGURE EX12.29 are balanced on the pivot. What is distance ?
The 5.0 kg, 60-cm-diameter disk in FIGURE P12.72 rotates on an axle passing
through one edge. The axle is parallel to the floor. The cylinder is held with the center of mass at the same height as the axle, then released. a. What is the cylinder’s initial angular acceleration? b. What is the cylinder’s angular velocity when it is directly below 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?
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