Week 7 Homework Assignment

1. (P.245 Prob.4) A cue stick hits a cue ball with an average force of 24N for a duration of 0.028s. If the mass of the ball is 0.16kg, how fast is it moving after being struck?
2. (P.245 Prob.14) A 3.0-kg body is initially moving northward at 15m/s. Then a force of 15N, toward the east, acts on it for 4.0s (a) At the end of 4.0s,whaat is the body's final velocity? (b) What is the change in momentum during the 4.0s?
3. (p.245 Prob.18) A submarine of mass 2.5 x 10⁶kg and initially at rest fires a torpedo of mass 250kg. The torpedo has an initial speed of 100.0m/s. What is the initial recoil speed of the submarine? Neglect the drag force of the water.
4. (P.246 Prob.22)Particle A is at the origin and has a mass of 30.0g. Particle B has a mass of 10.0g. Where must particle B be located if the coordinates of the center of mass are (x, y) = (2.0cm, 5.0cm)?
5. (P.246 Prob.28) If a particle of mass 5.0kg is moving east at 10m/s and a particle of mass 15kg is moving west at 10m/s, what is the velocity of the center of mass of the pair?
6. (P.246 Prob.32) A block of wood of mass 0.95kg is initially at rest. A bullet of mass 0.050kg traveling at 100.0m/s strikes the block and becomes embedded in it. With what speed  do the block of wood and the bullet move just after the collision?
7. (P.247 Prob.46) A hockey puck moving at 0.45m/s collides into another puck that was at rest. The pucks have equal mass. The first puck is deflected 37° to the right and moves off at 0.36m/s.Find the speed and direction of the second puck after the collision.