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Chapter 12: Q. 29 (page 331)
The two objects in FIGURE EX12.29 are balanced on the pivot. What is distance ?
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In FIGURE EX12.19, what magnitude force provides net torque about the axle?
A long, thin rod of mass M and length L is standing straight up on a table. Its lower end rotates on a frictionless pivot. A very slight push causes the rod to fall over. As it hits the table, what are
(a) the angular velocity and
(b) the speed of the tip of the rod?
The three 200g masses in FIGURE rigid rods.
a. What is the triangle's moment of inertia about the axis through the
b. What is the triangle's kinetic energy if it rotates about the axis
A 45 kg figure skater is spinning on the toes of her skates at 1.0 rev/s. Her arms are outstretched as far as they will go. In this orientation, the skater can be modeled as a cylindrical torso (40 kg, 20 cm average diameter, 160 cm tall) plus two rod-like arms (2.5 kg each, 66 cm long) attached to the outside of the torso. The skater then raises her arms straight above her head, where she appears to be a 45 kg, 20-cm-diameter, 200-cm-tall cylinder. What is her new angular velocity, in rev/s?
The 2.0 kg, 30-cm-diameter disk in Figure P12.66 is spinning at 300 rpm. How much friction force must the brake apply to the rim to bring the disk to a halt in 3.0 s?
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