Chapter 7
1. (p.202 prob.2) A child in a boat throws a 5.40-kg package out horizontally with a speed of 10.0m/s, Fig. 7-28. Calculate the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 26.0kg and that of the boat is 55.0kg.
2. (p.203 prob.16) A golf ball of mass 0.045kg is hit off the tee at a speed of 45m/s. the golf club was in contact with the ball for 5.0 x 10-3s. Find (a) the impulse imparted to the golf ball, and (b) the average force exerted on the ball by the goof club.
3. (p.203 prob.23) Two billiard balls of equal mass undergo a perfectly elastic head-on collision. If the speed of oone ball was initially 2.00m/s, and of the other 3.00m/s in the opposite direction, what will be their speeds after the collision?
4. (p.204 prob.32) An explosion breaks an object into two pieces one of which has 1.5 times the mass of the other. If 7500J were released in the explosion, how much kinetic energy did each piece acquire?
5. (p.206 prob.48) Three cubes, of side l0, 2l0, and 3l0, are place next to one another ( in contact) with their centers along a straight line and the l = 2l0 cube in the center (Fig. 7-36). What is the position, along this line, of the CM of this system? Assume the cubes are made of the same uniform material.