Chapter_9_solved_problems_Physics_1301_fall_2009

# Chapter_9_solved_problems_Physics_1301_fall_2009 - Chapter...

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Chapter 9 solved problems 18. Picture the Problem : The ball rebounds from the floor in the manner indicated by the figure at right. Strategy: The impulse is equal to the change in the y -component of the momentum of the ball. Use equation 9-6 in the vertical direction to find the impulse. Solution: Apply equation 9-6 in the y direction: Insight: There is no impulse in the x direction because the ball does not change its horizontal speed or momentum. 24. Picture the Problem : The two pieces fly in opposite directions at different speeds. . Strategy: As long as there is no friction the total momentum of the two pieces must remain zero, as it was before the explosion. Combine the conservation of momentum with the given kinetic energy ratio to determine the ratio of the masses. Let 1 m represent the piece with the smaller kinetic energy. Solution: 1. Set 0 = p r and solve for 1 2 m m : 2. Set 2 1 2 K K = : 2 2 1 2 2 2 2 2 1 2 1 1 1 2 1 1 2 2 2 m v K v m K v m m v = = = ÷ 3. Combine the expressions from steps 1 and 2: 2 2 2 1 1 1 1 2 2 2 2 2 v m m m v m m m = = = ÷ ÷ 4. The piece with the smaller kinetic energy has the larger mass. Insight:

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Chapter_9_solved_problems_Physics_1301_fall_2009 - Chapter...

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