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Unformatted text preview: Chapter 9 Problems 1, 2 , 3 = straightforward, intermediate, challenging Section 9.1 Linear Momentum and its Conservation 1. A 3.00-kg particle has a velocity of 3.00 i - 4.00 j ( 29 m / s . (a) Find its x and y components of momentum. (b) Find the magnitude and direction of its momentum. 2. A 0.100-kg ball is thrown straight up into the air with an initial speed of 15.0 m/s. Find the momentum of the ball (a) at its maximum height and (b) halfway up to its maximum height. 3. How fast can you set the Earth moving? In particular, when you jump straight up as high as you can, what is the order of magnitude of the maximum recoil speed that you give to the Earth? Model the Earth as a perfectly solid object. In your solution, state the physical quantities you take as data, and the values you measure or estimate for them. 4. Two blocks of masses M and 3 M 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 (Fig. P9.4). A cord initially holding the blocks together is burned; after this, the block of mass 3 M 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 if M = 0.350 kg. Figure P9.4 5. (a) A particle of mass m moves with momentum p. Show that the kinetic energy of the particle is K = p 2 /2 m . (b) Express the magnitude of the particles momentum in terms of its kinetic energy and mass. Section 9.2 Impulse and Momentum 6. A friend claims that, as long as he has his seatbelt on, he can hold on to a 12.0-kg child in a 60.0 mi/h head-on collision with a brick wall, in which the car passenger compartment comes to a stop in 0.050 0 s. Show that the violent force during the collision will tear the child from his arms. A child should always be in a toddler seat secured with a seat belt in the back seat of a car. 7. An estimated force-time curve for a baseball struck by a bat is shown in Figure P9.7. 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. Figure P9.7 8. A ball of mass 0.150 kg is dropped from rest from a height of 1.25 m. It rebounds from the floor to reach a height of 0.960 m. What impulse was given to the ball by the floor?...
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