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Practice Homework 9

# Practice Homework 9 - practice 09 ALIBHAI ZAHID Latest...

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practice 09 – ALIBHAI, ZAHID 1 Latest unpenalized work: Mar 25 2007 Sun- day 04:00 (after this date you can not make a perfect score). Work cutoff: Mar 25 2007, 4:00 am. Question 1 part 1 of 1 10 points Assume an elastic collision (ignoring fric- tion and rotational motion). A queue ball initially moving at 4 . 2 m / s strikes a stationary eight ball of the same size and mass. After the collision, the queue ball’s final speed is 1 . 8 m / s . 4 . 2 m / s 1 . 8 m / s θ φ Before After Find the queue ball’s angle θ with respect to its original line of motion. Answer in units of . Question 2 part 1 of 1 10 points Two identical balls are on a frictionless hor- izontal tabletop. Ball X initially moves at 10 meters per second, as shown in figure on the left-hand side. It then collides elastically with ball Y , which is initially at rest. After the col- lision, ball X moves at 6 meters per second along a path at 53 to its original direction, as shown in on the right-hand side. 10 m/s X before Y after 6 m/s X 0 m/s 53 Which of the following diagrams best repre- sents the motion of ball Y after the collision? 1. 8 m/s Y after 2. after 4 m/s Y 53 3. 6 m/s Y after 4. after 8 m/s Y 53 5. 0 m/s Y after 6. after 6 m/s Y 37 7. after 8 m/s Y 37 8. after 4 m/s Y 37 9. 4 m/s Y after 10. after 6 m/s Y 53

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practice 09 – ALIBHAI, ZAHID 2 Question 3 part 1 of 3 10 points A hockey puck of mass 0.6 kg with an ini- tial speed of 9 . 14 m / s collides elastically with another equally massive puck initially at rest. After the collision, the two hockey pucks are observed to have the same speed, each recoil- ing symmetrically at equal magnitude but op- positely directed angles from the initial puck’s direction. v 0 v v Φ Before After What is the angle Φ between the two recoil- ing pucks? Answer in units of . Question 4 part 2 of 3 10 points What is the speed of each recoiling puck?
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