Phys-chapt 7

# Phys-chapt 7 - PHYSICS 111 SPRING 2008 HOMEWORK#11 SOLUTION Chap 7 Question 18 Where would you expect the center of mass of a doughnut to located

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PHYSICS 111 SPRING 2008 HOMEWORK # 11 SOLUTION Chap 7 , Question 18 Where would you expect the center of mass of a doughnut to located? Why? Answer : It is at the center of the circle. Since we can assume the doughnut’s mass is distributed symmetrically about the center, then, the center-of-mass point is located at the geometric center of the object. Chap 7, Problem 30 The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.025kg and is moving along the x axis with a velocity of 5.5m/s. It makes a collision with puck B, which has a mass of 0.050kg and is initially at rest. The collision is not head-on. After the collision, the two pucks fly apart with the angles shown in the drawing. Find the final speed of (a) puck A and (b) puck B. Solution : In this collision, the total momentum is conserved, which means both of the x and y component of the total momentum will conserve. X direction:

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## This note was uploaded on 03/27/2008 for the course PHYS 111 taught by Professor Shinar during the Spring '08 term at Iowa State.

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Phys-chapt 7 - PHYSICS 111 SPRING 2008 HOMEWORK#11 SOLUTION Chap 7 Question 18 Where would you expect the center of mass of a doughnut to located

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