EPChap11-Solution2 - Chap. 11, HW2 Questions 7. The angular...

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5 Chap. 11, HW2 Questions 7. The angular momenta () t l of a particle in four situations are (1) 3 : 4 3 = = + = dt dl t l τ (2) t dt dl t l 12 : 6 2 = = = (3) 0 : 2 = = = dt dl l (4) 2 / 4 : / 4 t dt dl t l = = = In which situation is the net torque on the particle (a) zero: (3) (b) positive and constant: (1) (c) negative and increasing in magnitude ( t > 0): (2) (d) negative and decreasing in magnitude ( t > 0): (4) 8. Figure 11-28 gives the angular momentum magnitude L of a wheel versus time t . Rank the four lettered time intervals according to the magnitude of the torque acting on the wheel, greatest first. Since dt dl = , the torque is equal to the slope Ranking: D, B, then A and C tie at 0 . 10. A rhinoceros beetle rides the rim of a horizontal disk rotating counterclockwise like a merry-go-round. If the beetle then walks along the rim in the direction of the rotation, will the magnitudes of the following quantities (each measured about the rotation axis) increase, decrease, or remain the same (the disk is still rotating in the counterclockwise direction): (a) the angular momentum of the beetle–disk system, Stays the same. There are no external torques (b) the angular momentum and angular velocity of the beetle Increases. The beetle is going faster (c) the angular momentum and angular velocity of the disk? Since the beetle angular momentum increases, the disk angular momentum decreases (d) What are your answers if the beetle walks in the direction opposite the rotation?
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EPChap11-Solution2 - Chap. 11, HW2 Questions 7. The angular...

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