Physics 30S Final Exam Review-2.pdf

Physics 40S RRSD Final Exam – June 2005 Page 47. Elaine is a championship lawn bowler. Her practice lawn bowling lawn is 30mlong. Her ball takes 12 seconds to stop. At what rate does her ball decelerate?a) 0.12 m/s/s b) 0.22 m/s/sc) 0.32 m/s/s d) 0.42 m/s/s8. A 50-kilogram student threw a 0.40-kilogram ball with a speed of 20.0 metersper second. What was the magnitude of the impulse that the student exerted onthe ball?a) 8.0 N•s b)c) 78 N•s d)24.0×10 N•s31.0×10 N•s9. The two objects shown below collide head-on. The velocity of the 9.5 kg objectafter collision is 5.4 m/s to the left. The velocity of the 2.4 kg object aftercollision is :a) 15 m/s to the right b) 8.7 m/s to the leftc) 8.0 m/s to the right d) 6.2 m/s to the left10. A 0.2-kilogram red ball is thrown horizontally at a speed of 4 meters per secondfrom a height of 3 meters. A 0.4-kilogram green ball is thrown horizontallyfrom the same height at a speed of 8 meters per second. Compared to the time ittakes the red ball to reach the ground, the time it takes the green ball to reachthe ground is:a) one-half as great b) the samec) twice as great d) four times as great11. Which of the following units are correct units for momentum?a) J•s b) N•mc) N•s d) N J12. The time a projectile is in the air depends on:a) its mass b) its horizontal velocityc) its vertical velocity d) none of the above