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Chapter 12: Q. 3 (page 330)
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.
The speed of the tip of the blade is 1.15 m/s
The number of revolutions is 12.5 rev
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In Figure P12.59, an 80 kg construction worker sits down 2.0 m from the end of a 1450 kg
steel beam to eat his lunch. What is the tension in the cable?
A V -diameter turntable rotates at on frictionless bearings. Two blocks fall from above, hit the turntable simultaneously at opposite ends of a diameter, and stick. What is the turntable's angular velocity, in rpm, just after this event?
Starting from rest, a 12-cm-diameter compact disk takes 3.0 s to reach its operating angular velocity of 2000 rpm . Assume that the angular acceleration is constant. The disk's moment of inertia is .
a. How much net torque is applied to the disk?
b. How many revolutions does it make before reaching full speed?
In FIGURE CP12.88, a 200 g toy car is placed on a narrow 60-cm-diameter track with wheel grooves that keep the car going in a circle. The 1.0 kg track is free to turn on a frictionless, vertical axis. The spokes have negligible mass. After the car鈥檚 switch is turned on, it soon reaches a steady speed of 0.75 m/s relative to the track. What then is the track鈥檚 angular velocity, in rpm?
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?
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