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11. What happens to the kinetic energy of a moving object if the net work done is positive? c. The kinetic energy remains the same d. The kinetic energy is zero a. The kinetic energy increases b. The kinetic energy decreases 12. When a rock is dropped from height H, it reaches the ground with speed V. Assuming there is no air resistance, from what height should it be dropped so it will reach the ground with twice speed? a. 16H b. 8H c. 4H 13. Which of the following statements is false? a. The unit of energy and work is the same b. The area under a force/distance graph gives the work done c. Electrical energy is converted to mechanical energy by a generator d. Efficiency is the ratio of the useful output energy to the input energy d. 2H

11. What happens to the kinetic energy of a moving object if the net work done is positive? c. The kinetic energy remains the same d. The kinetic energy is zero a. The kinetic energy increases b. The kinetic energy decreases 12. When a rock is dropped from height H, it reaches the ground with speed V. Assuming there is no air resistance, from what height should it be dropped so it will reach the ground with twice speed? a. 16H b. 8H c. 4H 13. Which of the following statements is false? a. The unit of energy and work is the same b. The area under a force/distance graph gives the work done c. Electrical energy is converted to mechanical energy by a generator d. Efficiency is the ratio of the useful output energy to the input energy d. 2H

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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11. What happens to the kinetic energy of a moving object if the net work done is positive? a. The kinetic energy increases c. The kinetic energy remains the same d. The kinetic energy is zero b. The kinetic energy decreases 12. When a rock is dropped from height H, it reaches the ground with speed V. Assuming there is no air resistance, from what height should it be dropped so it will reach the ground with twice speed? a. 16H b. 8H c. 4H 13. Which of the following statements is false? a. The unit of energy and work is the same b. The area under a force/distance graph gives the work done c. Electrical energy is converted to mechanical energy by a generator d. Efficiency is the ratio of the useful output energy to the input energy d. 2H 14. An object is lifted 2000 mm by a crane. If the force required is 100 N, the work done is: a. 1/20 Nm b. 200 kN m c. 200 Nm d. 20 J 15. A large and a small sphere are released at the same time from the same height above the ground. Which one of the following quantities associated with the spheres will be the same for both after 1 second, if frictional effects are ignored? a. speed b. momentum c. potential energy d.kinetic energy 16. A ball has a speed of 15 m/s. Only one external force acts on the ball. After this force acts, the speed of the ball is 7 m/s. What type of work has the force done on the ball? a. positive b. zero c. negative d. can't be determined
Transcribed Image Text:11. What happens to the kinetic energy of a moving object if the net work done is positive? a. The kinetic energy increases c. The kinetic energy remains the same d. The kinetic energy is zero b. The kinetic energy decreases 12. When a rock is dropped from height H, it reaches the ground with speed V. Assuming there is no air resistance, from what height should it be dropped so it will reach the ground with twice speed? a. 16H b. 8H c. 4H 13. Which of the following statements is false? a. The unit of energy and work is the same b. The area under a force/distance graph gives the work done c. Electrical energy is converted to mechanical energy by a generator d. Efficiency is the ratio of the useful output energy to the input energy d. 2H 14. An object is lifted 2000 mm by a crane. If the force required is 100 N, the work done is: a. 1/20 Nm b. 200 kN m c. 200 Nm d. 20 J 15. A large and a small sphere are released at the same time from the same height above the ground. Which one of the following quantities associated with the spheres will be the same for both after 1 second, if frictional effects are ignored? a. speed b. momentum c. potential energy d.kinetic energy 16. A ball has a speed of 15 m/s. Only one external force acts on the ball. After this force acts, the speed of the ball is 7 m/s. What type of work has the force done on the ball? a. positive b. zero c. negative d. can't be determined
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