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Chapter 7: Q18Q (page 170)
Why can a batter hit a pitched baseball farther than a ball he himself has tossed up in the air?
The change in momentum is more, and the ball goes farther when a batter hits a pitched baseball than a ball tossed up by him.
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A squash ball hits a wall at a 45掳 angle as shown in Fig. 7鈥�29. What is the direction (a) of the change in momentum of the ball, (b) of the force on the wall?
The CM of an empty 1250-kg car is 2.40 m behind the front of the car. How far from the front of the car will the CM be when two people sit in the front seat 2.80 m from the front of the car, and three people sit in the back seat 3.90 m from the front? Assume that each person has a mass of 65.0 kg.
A 725-kg two-stage rocket is traveling at a speed of \({\bf{6}}{\bf{.60 \times 1}}{{\bf{0}}^{\bf{3}}}\;{\bf{m/s}}\) away from Earth when a predesigned explosion separates the rocket into two sections of equal mass that then move with a speed of \({\bf{2}}{\bf{.80 \times 1}}{{\bf{0}}^{\bf{3}}}\;{\bf{m/s}}\)relative to each other along the original line of motion.
(a) What is the speed and direction of each section (relative to Earth) after the explosion?
(b) How much energy was supplied by the explosion? [Hint: What is the change in kinetic energy as a result of the explosion?]
A 12-kg hammer strikes a nail at a velocity of 7.5 m/s and comes to rest in a time interval of 8.0 ms.
(a) What is the impulse given to the nail?
(b) What is the average force acting on the nail?
A very elastic 鈥渟uperball鈥� is dropped from a height h onto a hard steel plate (fixed to the Earth), from which it rebounds at very nearly its original speed. (a) Is the momentum of the ball conserved during any part of this process? (b) If we consider the ball and the Earth as our system, during what parts of the process is momentum conserved? (c) Answer part (b) for a piece of putty that falls and sticks to the steel plate.
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