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Chapter 11: Q. 60 (page 290)
Force is exerted on a 250 g particle during the interval. If the particle starts from rest, what is its speed at t = 2.0 s?
The speed atis
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You are part of a search-and-rescue mission that has been called out to look for a lost explorer. You鈥檝e found the missing explorer, but, as FIGURE P11.50 shows, you鈥檙e separated from him by a -high cliff and a -wide-raging river. To save his life, you need to get a 5.0 kg package of emergency supplies across the river. Unfortunately, you can鈥檛 throw the package hard enough to make it across. Fortunately, you happen to have a 1.0 kg rocket intended for launching flares. Improvising quickly, you attach a sharpened stick to the front of the rocket so that it will impale itself into the package of supplies, then fire the rocket at ground level toward the supplies. What minimum speed must the rocket have just before impact in order to save the explorer鈥檚 life?
Two particles collide, one of which was initially moving and the other initially at rest.
a. Is it possible for both particles to be at rest after the collision? Give an example in which this happens, or explain why it can鈥檛 happen.
b. Is it possible for one particle to be at rest after the collision? Give an example in which this happens, or explain why it can鈥檛 happen.
The stoplight had just changed and a 2000 kg Cadillac had entered the intersection, heading north at 3.0 m/s, when it was struck by a 1000 kg eastbound Volkswagen. The cars stuck together and slid to a halt, leaving skid marks angled 35掳 north of east. How fast was Volkswagen going just before the impact?
A ball collides with a wall. FIGURE EX11.13 shows the ball鈥檚 velocity and the force exerted on the ball by the wall. What is , the ball鈥檚 rebound velocity?
Suppose a rubber ball collides head-on with a more massive steel ball traveling in the opposite direction with equal speed. Which ball, if either, receives the larger impulse? Explain.
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