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two balls of equal mass are thrown horizontally with the same initial velocity. they hit identical stationary boxes resting on a frictionless horizontal surface. the ball hitting box 1 bounces back, while the ball hitting box 2 gets stuck.

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SOLVED:The next two questions pertain to the situation described below: Box 1: Ball Bounces Box 2: Ball Sticks Two balls of equal mass are thrown horizontally with the same initial velocity: They hit identical stationary boxes resting on a frictionless horizontal surface_ The ball hitting box bounces back, while the ball hitting box 2 gets stuck to the box. You can assume that there is no motion in the vertical direction before or after the collisions_ 11) Which box has the greater speed after the collision? pts: ) Box 2 Both boxes have the same speed Box 12) For Box 1, the mass of the box is 1.8 kg and the mass of the ball is 0.45 kg; Suppose the ball has an initial horizontal velocity of 14 m/s and bounces off the box with a horizontal velocity of

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Zachary E.

Physics 101 Mechanics

5 months, 3 weeks ago

The next two questions pertain to the situation described below: Box 1: Ball Bounces Box 2: Ball Sticks Two balls of equal mass are thrown horizontally with the same initial velocity: They hit identical stationary boxes resting on a frictionless horizontal surface_ The ball hitting box bounces back, while the ball hitting box 2 gets stuck to the box. You can assume that there is no motion in the vertical direction before or after the collisions_ 11) Which box has the greater speed after the collision? pts: ) Box 2 Both boxes have the same speed Box 12) For Box 1, the mass of the box is 1.8 kg and the mass of the ball is 0.45 kg; Suppose the ball has an initial horizontal velocity of 14 m/s and bounces off the box with a horizontal velocity of -9.1 mls. If the ball is in contact with the box for 0.23 \$, what is the average horizontal force acting on Box 1 during the bounce? pts: ) 17.8 N 45.2 N 180.8 N

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Linda W.
University of North Carolina at Chapel Hill

Each of these problems consists of Concept Questions followed by a related quantitative Problem. The Concept Questions involve little or no mathematics. They focus on the concepts with which the problems deal. Recognizing the concepts is the essential initial step in any problem-solving technique. Concept Questions Part aa of the drawing shows a bullet approaching two blocks resting on a horizontal frictionless surface. Air resistance is negligible. The bullet passes completely through the first block (an inelastic collision) and embeds itself in the second one, as indicated in part bb. Note that both blocks are moving after the collision with the bullet. (a) Can the conservation of linear momentum be applied to this three-object system, even though the second collision occurs a bit later than the first one? Justify your answer. Neglect any mass removed from the first block by the bullet. (b) Is the total kinetic energy of this three-body system conserved? If not, would the total kinetic energy after the collisions be greater than or smaller than that before the collisions? Justify your answer. Problem A 4.00 -g bullet is moving horizontally with a velocity of +355m/s$+355m/s$, where the + sign indicates that it is moving to the right. The mass of the first block is 1150g$1150g$, and its velocity is +0.550m/s$+0.550m/s$ after the bullet passes through it. The mass of the second block is 1530g$1530g$. (a) What is the velocity of the second block after the bullet imbeds itself? (b) Find the ratio of the total kinetic energy after the collision to that before the collision. Be sure your answer is consistent with that in part (b) of the Concept Questions.

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Chapter 7

Impulse and Momentum

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