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Chapter 11: Q. 42 (page 289)
A ball is dropped from a height of , bounces on a hard floor, and rebounds to a height of . FIGURE P11.41 shows the impulse received from the floor. What maximum force does the floor exert on the ball?
The maximum force exerted on the ball is
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It feels better to catch a hard ball while wearing a padded glove than to catch it bare handed. Use the ideas of this chapter to explain why
At the center of a 50-m-diameter circular ice rink, a 75 kg skater traveling north at 2.5 m/s collides with and holds on to a 60 kg skater who had been heading west at 3.5 m/s.
a. How long will it take them to glide to the edge of the rink?
b. Where will they reach it? Give your answer as an angle north of west
A neutron is an electrically neutral subatomic particle with a mass just slightly greater than that of a proton. A free neutron is radioactive and decays after a few minutes into other subatomic particles. In one experiment, a neutron at rest was observed to decay into a proton and an electron . The proton and electron were shot out back-to-back. The proton speed was measured to be and the electron speed was . No other decay products were detected.
a. Did momentum seem to be conserved in the decay of this neutron?
b. If a neutrino was emitted in the above neutron decay, in which direction did it travel? Explain your reasoning.
c. How much momentum did this neutrino 鈥渃arry away鈥� with it?
A spaceship of mass 2.0 106 kg is cruising at a speed of 5.0 106 m/s when the antimatter reactor fails, blowing the ship into three pieces. One section, having a mass of 5.0 105 kg, is blown straight backward with a speed of 2.0 106 m/s. A second piece, with mass 8.0 105 kg, continues forward at 1.0 106 m/s. What are the direction and speed of the third piece?
Fred (mass ) is running with the football at a speed of when he is met head-on by Brutus (mass ), who is moving at . Brutus grabs Fred in a tight grip, and they fall to the ground. Which way do they slide, and how far? The coefficient of kinetic friction between football uniforms and Astroturf is .
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