ࡱ> RTQ[{ 82bjbjzz q5! pp$ljurD]]]qqqqqqq$wt)wzr]Y]]]rD9/r```]j6Dq`]q``pqDA>]pqEr0urpw%^w(qwq(]]`]]]]]rr`]]]ur]]]]w]]]]]]]]]p :  Impulse-Momentum Theorem  1. A bronze statue of Buddha was completed in Tokyo in 1993. The statue is 35 m tall and has a mass of 1.00 x 106 kg. Suppose the statue were to be moved to a new location. What is the magnitude of the impulse that must act on the statue in order for the speed to increase from 0 m/s to 0.20 m/s? If the magnitude of the net force acting on the statue is 12,500 N, how long will it take for the final speed to be reached? (16 s)  2. The human cannonball has long been a popular and extremely dangerous circus stunt. In order for a 45-kg person to leave the cannon with the fastest speed yet achieved by a human cannonball, a 1.6 x 103 N force must be exerted on that person for 0.68 seconds. What is this record speed achieved in this peculiar launch? (24.2 m/s)  3. In 1990, Gary Stewart of California made 177,737 jumps on a pogo stick. Suppose that the pogo stick reaches a height of 0.12 meters with each jump, and that the average net force acting on the stick during contact with the ground is 330 N upward. (a) What is the speed of the man and pogo stick when they strike the ground use energy? (1.53 m/s) (b) What is the time of contact with the ground between the jumps? Assume that the total mass of Stewart and the pogo stick is 65-kg. (Hint, the difference between initial and final velocities, before and after collision, is one of direction NOT magnitude). (.60 s) 4. A soccer ball (m = 1.2 kg) traveling with a velocity of 12 m/s as shown is kicked, sending it in the opposite direction with a velocity of 15 m/s. (a) What is the change in velocity (vf vi) experienced by the ball? (27 m/s) What is the change in momentum experienced by the ball? (32.4 kg(m/s) If the time the kickers foot was in contact with the ball was 0.25 seconds, what average force did the kicker exert on the ball? (130 N)  5. A soccer ball (m = 1.2 kg) traveling with a velocity of 12 m/s as shown is kicked, sending it in the direction shown with a velocity of 15 m/s. (a) What is the change in velocity (vf vi) experienced by the ball? (10.7 m/s @ 107.5() What is the change in momentum experienced by the ball (dont forget to include direction)? (12.8 kg(m/s @ 107.5() If the time the kickers foot was in contact with the ball was 0.25 seconds, what average force did the kicker exert on the ball? (51 N) 6. A 0.5 kg object is initially at rest. A 3.00 N force to the right acts on the object over a period of 1.5 seconds. Then a 4.00 N force to the left acts on the object for 3.0 seconds. What is the velocity of the object at the end of the 1.5 s time interval? (9 m/s, East) What is the final velocity of the object? (15 m/s, West) 7. An 845 kg dragster accelerate from rest to 100 km/hr in 0.9 seconds. What change in momentum occurs in m/s? (23472 kg(m/s) What is the average force exerted on the car? (26080 N) 8. A 615 g ball strikes a wall at 14.6 m/s and rebounds at 11.2 m/s. The ball is in contact with the wall for 0.042 s. What is the magnitude of the force acting on the ball during the collision? (378 N) 9. A tennis ball (m=0.15 kg) rebounds from a wall as shown. What is the change in momentum (impulse) that occurred? Hint, remember when you are finding (p, you are subtracting vectors which is adding negative vectors) (4.23 kg(m/s left).   10. The largest grand piano in the world is really grand. Built in London, it has a mass of 1.25 x 103 kg. Suppose a pianist finishes playing this piano and pushes herself from the piano so that she rolls backwards with a speed of 1.4 m/s. Meanwhile, the piano rolls forward with a velocity of 0.06 m/s. What is the mass of the pianist and the stool upon which she sits? (53.6 kg)  11. The largest frog ever found was discovered in Cameroon in 1989. The frogs mass was nearly 3.6 kg. Suppose this frog is placed on a skateboard of mass 3.0 kg. The frog jumps horizontally off the skateboard to the right, and the skate board rolls freely in the opposite direction with a speed of 2.0 m/s relative to the ground. If the frog and skateboard were initially at rest, what is the initial horizontal velocity of the frog jumping off the skateboard? (1.67 m/s, opposite direction) 12. A rifle, m = 2.5 kg fires a 5 g bullet with a speed of 300 m/s. What is the change in momentum/impulse imparted to the bullet (in Ns)? (1.5 kg m/s) What if the bullet was accelerated for a time of 0.12 seconds, what is the average force exerted on the bullet during this time? (12.5 N) What is the average force exerted on the gun during this time (consider Newtons Third Law of Motion)? (-12.5 N) What is the change in momentum/impulse imparted to the gun? (-1.5 kg m/s) What is the recoil (kick-back) velocity of the gun? (-0.6 m/s) 13. A 15,000 kg railroad car moving at 7.0 m/s to the north collides with and couples with another railroad car of the same mass that is moving in the same direction at 1.5 m/s. What is the velocity of the joined cars after collision? (4.25 m/s) 14. Two students on roller skates stand face-to-face, and then push each other away. One student has a mass of 90 kg and the second has a mass of 60 kg. Find the ratio of the magnitude of the first students velocity to the second students velocity (v1/v2)     15. A large firecracker initially at rest ignites and explodes into three pieces. The pieces and their velocities are illustrated to the right. What is the initial momentum of the firecracker? What is the velocity of the 0.4 kg piece after the explosion? (22.5 m/s to the left) 16. A car of mass 1800 kg traveling east with a velocity of 10 m/s hits a second car (mass = 1200 kg) traveling south with a velocity of 8 m/s and they stick together. What is the velocity of the mass of cars just after the collision? (6.8 m/s @28( south of east) 17. A blue shuffleboard disc (m = 1.2 kg) traveling east with a velocity of 5 m/s strikes a red disc (at rest and of same mass) off center so that the red disc travels along a path 36.87( north of east with a velocity of 4 m/s. (a) What is the magnitude and direction of the velocity of the blue shuffleboard disc after the collision? Assume friction is negligible. (b) Is the collision elastic? It may be helpful to tabulate your information:  18. A green ball (m = 5kg) traveling with a velocity of 2 m/s strikes a red ball (m = 5 kg) head on with a velocity of 3 m/s in the opposite direction in an elastic collision. What are the velocities of the balls after the collision? It may be helpful to tabulate information:    19. A tennis ball (m = 0.5 kg) strikes and hits a wall as shown. If the velocity with which it strikes the wall is 12 m/s, and the velocity with which it returns from the wall is 12 m/s, find (a) The change in momentum (impulse imparted to ball) by the wall. (11.28 kg(m/s) (b) The force the wall exerted on the ball, if the ball was in contact with the wall for 0.15 seconds. (75.2 N) 20. A 1850-kg luxury (gas-guzzling) sedan stopped at a traffic light is struck from behind by a compact car of mass 975 kg. The collision is inelastic. If the compact car was moving with a velocity of 22.0 m/s to the north before the collision, what is the velocity of the entangled mess after the collision? (7.6 m/s North) 21. A girl on a 2.0 kg skateboard initially at rest tosses an 8.0 kg jug of water in the forward direction. If the jug has a speed of 3.0 m/s relative to the ground and the boy and skateboard move in the opposite direction at 0.60 m/s, find the girls mass (38 kg). 22. A 5-kg bowling ball moving to the right at 2 m/s makes an elastic head-on collision with a 1-kg basketball moving to the left at 4 m/s. After the collision, the basketball moves to the right with a velocity of 6 m/s. (a) Assuming that the surface upon which they roll is horizontal and frictionless, what is the velocity of bowling ball after the collision? (b) Was the collision elastic (was kinetic energy conserved)? (0 m/s, yes, KE was conserved) 23. Given the acceleration vs. time graph for a toy car crash, find the impulse imparted to car (m = 1.2 kg) during the collision. 24. The following represent the force vs. time graphs for two different scenarios of a toy car (m = 2.5 kg) speeding up. (a) What is the change in velocity experienced by the car in each scenario? (b) What is the impulse delivered to the car in each? 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