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Chapter 8 – part A

Chapter 8 – part A. Momentum Impulse 1D collisions. Physics relations. Definitions. Momentum Impulse Collisions. +, if collision is elastic:. Exercise 8.5.

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Chapter 8 – part A

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  1. Chapter 8 – part A Momentum Impulse 1D collisions

  2. Physics relations Definitions • Momentum • Impulse • Collisions +, if collision is elastic:

  3. Exercise 8.5 5. Two blocks with masses M and 3M are placed on a horizontal, frictionless surface. A light spring is attached to one of them, and the blocks are pushed together with the spring between them. A cord initially holding the blocks together is burned; after this, the block of mass 3M moves to the right with a speed of 2.00 m/s. (a) What is the speed of the block of mass M? (b) Find the original elastic potential energy in the spring, taking M = 0.350 kg.

  4. Exercise 8.7 7. An estimated force–time curve for a baseball struck by a bat is shown in Figure. From this curve, determine (a) the impulse delivered to the ball, (b) the average force exerted on the ball, and (c) the peak force exerted on the ball.

  5. Exercise 8.9 9. A 3.00-kg steel ball strikes a wall with a speed of 10.0 m/s at an angle of 60.0° with the surface. It bounces off with the same speed and angle. If the ball is in contact with the wall for 0.200 s, what is the average force exerted on the ball by the wall?

  6. Exercise 8.16 16. Two blocks are free to slide along the frictionless wooden track ABC shown in Figure P8.16. A block of mass m1 = 5.00 kg is released from A. Protruding from its front end is the north pole of a strong magnet, repelling the north pole of an identical magnet embedded in the back end of the block of mass m2 = 10.0 kg, initially at rest. The two blocks never touch. Calculate the maximum height to which m1 rises after the elastic collision.

  7. Exercise 8.18 18. As shown in Figure, a bullet of mass m and speed v passes completely through a pendulum bob of mass M. The bullet emerges with a speed of v/2. The pendulum bob is suspended by a stiff rod of length ℓ and negligible mass. What is the minimum value of v such that the pendulum bob will barely swing through a complete vertical circle?

  8. Exercise 8.23 23. A tennis ball of mass 57.0 g is held just above a basketball of mass 590 g. With their centers vertically aligned, both are released from rest at the same time, to fall through a distance of 1.20 m, as shown in Figure. (a) Find the magnitude of the downward velocity with which the basketball reaches the ground. Assume that an elastic collision with the ground instantaneously reverses the velocity of the basketball while the tennis ball is still moving down. Next, the two balls meet in an elastic collision. (b) To what height does the tennis ball rebound?

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