* * 4 x 4 % Unit Exam 5: Energy and Momentum 1 1. If the speed of a moving object is doubled, the kinetic energy of the object is 17. A 1000.-kilogram car traveling 20.0 meters per A) halved second east experiences an impulse of 2000. newton B) doubled . seconds west. What is the final velocity of the car C) unchanged- () quadrupled after the impulse has been applied? LX4X 16 ZX) 18.0 m/s east B) 19.5 m/s east C) 20.5 m/s west x D) 22.0 m/s west 12. A motor does a total of 480 joules of work in 5.0 Fnet t 1000 kg 20 t seconds to lift a 12-kilogram block to the top of a 7000 com / seas ramp. The average power developed by the motor is 20oom 18. When a mass is placed on a spring with a spring A) 8.0 W B) 40. W C) 96 W F 4 yo J constant of 60.0 newtons per meter, the spring is D) 2400 W compressed 0.500 meter. How much energy is stored in the spring? W 480 J T 5 sec m 1zky A) 60.0 J B) 30.0 J C) 15.0 J D) 7.50 J 13. How much work is required to lift a 10.-newton weight from 4.0 meters to 40. meters above the surface of Earth? A) 2.5 J B) 3.6J 19. What is the kinetic energy of a 55-kilogram skier 9) 3.6 x102 J D) 4.0 x 102 J traveling at 9.0 meters per second? A) 2.5 x 102 J 7.81 B) 5.0 x 102 J C) 2.2 x 103 J D) 4.9 x 103 J 14. A spring gains 2.34 joules of elastic potential energy as it is compressed 0.250 meter from its equilibrium position. What is the spring constant of this spring? 20. As shown in the diagram below, a student exerts an A) 9.36 N/m B) 18.7 N/m average force of 600. newtons on a rope to lift a C) 37.4 N/m 50.0-kilogram crate a vertical distance of 3.00 D) 74.9 N/m meters. LLLLLLLLLLLLLLLLLLL O F= 600. N 15. Which quantity is a measure of the rate at which work is done? A) energy B) power d =3.00 m C) momentum D) velocity m = 50.0 kg 16. A shopping cart slows as it moves along a level Compared to the work done by the student, the floor. Which statement describes the energies of the gravitational potential energy gained by the crate is cart? A) exactly the same B) 330 J less A) The kinetic energy increases and the C) 330 J more D 150 J more gravitational potential energy remains the same. B) The kinetic energy increases and the gravitational potential energy decreases. C) The kinetic energy decreases and the gravitational potential energy remains the same. D) The kinetic energy decreases and the gravitational potential energy increases