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Unformatted text preview: homework 09 – ALIBHAI, ZAHID 1 Latest unpenalized work: Mar 26 2007 Mon day 04:00 (after this date you can not make a perfect score). Work cutoff: Mar 28 2007, 4:00 am. Question 1 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 lefthand 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 righthand side. 10 m/s X before Y after 6 m/s X 0 m/s b b 53 ◦ Which of the following diagrams best repre sents the motion of ball Y after the collision? 1. 8 m/s Y after b 2. after 4 m/s Y 53 ◦ b 3. 6 m/s Y after b 4. after 8 m/s Y 53 ◦ b 5. 0 m/s Y b after 6. after 6 m/s Y 37 ◦ b 7. after 8 m/s Y 37 ◦ b 8. after 4 m/s Y 37 ◦ b 9. 4 m/s Y after b 10. after 6 m/s Y 53 ◦ b Question 2 part 1 of 1 10 points Two objects of mass 5 g and 4 g , respec tively, move parallel to the xaxis, as shown. The 5 g object overtakes and collides with the 4 g object. Immediately after the collision, the ycomponent of the velocity of the 5 g object is 2 m / s upward. v i 5 g v i 4 g What is the ycomponent of the velocity vectorv of the 4 g object immediately after the collision? 1. vectorv y = 6 m / s downward homework 09 – ALIBHAI, ZAHID 2 2. vectorv y = 12 . 8 m / s downward 3. vectorv y = 2 . 5 m / s downward 4. vectorv y = 7 . 2 m / s downward 5. vectorv y = 15 m / s downward 6. vectorv y = 7 m/s upward 7. vectorv y = 10 . 6667 m / s downward 8. vectorv y = 5 m/s upward Question 3 part 1 of 1 10 points Two ice skaters approach each other at right angles. Skater A has a mass of 71 . 5 kg and travels in the + x direction at 1 . 96 m / s. Skater B has a mass of 55 . 1 kg and is moving in the + y direction at 1 . 09 m / s. They collide and cling together. Find the final speed of the couple. Answer in units of m / s. Question 4 part 1 of 2 10 points A(n) 5 kg object moving with a speed of 6 . 8 m / s collides with a(n) 18 kg object moving with a velocity of 9 . 6 m / s in a direction 21 ◦ from the initial direction of motion of the 5 kg object....
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 Spring '08
 Turner
 Angular Momentum, Friction, Kinetic Energy, Mass, Work, Moment Of Inertia, Rigid Body

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