Chapter 12: Q. 21 (page 331)
The axle in FIGURE EX12.21 is half the distance
to the rim. What is the net torque about the axle? II
sd
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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
Your task in a science contest is to stack four identical uniform bricks, each of length L, so that the top brick is as far to the right as possible without the stack falling over. Is it possible, as Figure P12.61 shows, to stack the bricks such that no part of the top brick is over the table? Answer this question by determining the maximum possible value of d.
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 .
Is the center of mass of the dumbbell in FIGURE Q12.1 at point a, b, or c? Explain.
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?
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