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Chapter 12: Q. 19 (page 331)
In FIGURE EX12.19, what magnitude force provides net torque about the axle?
The magnitude of the force is
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How far from the center of the earth is the center of mass of the earth +moon system? Data for the earth and moon can be found inside the back cover of the book.
The center of mass of the Earth-Moon system from the center of the Earth is .
The three masses shown in FIGURE EX12.6 are connected by massless, rigid rods. What are the coordinates of the center of mass?
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?
The sphere of mass M and radius R in FIGURE P12.76 is rigidly attached to a thin rod of radius r that passes through the sphere at distance 12 R from the center. A string wrapped around the rod pulls with tension T. Find an expression for the sphere’s angular acceleration. The rod’s moment of inertia is negligible.
A drum major twirls a 96 -cm-long, 400g baton about its center of mass at 100 rpm. What is the baton's rotational kinetic energy?
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