University physics答案2023秋

第四章测试

1.In a hydroelectric generating station, falling water is used to drive turbines (“water wheels”), which in turn run electric generators. Compared to the amount of gravitational potential energy released by the falling water, how much electrical energy is produced? （ ）
A:more; B:not enough information given to decide. C:the same; D:less.
答案:D
2.How much work is done by the force F acting on a body when the body moves from x=0m to x=2.0m under the force of ? （ ）
A:– 24J B:- 34 J C:- 14 J D:20 J 3.The theorem of kinetic energy of a particle follows that the amount of work done is independent of the path. （ ）
A:对 B:错 4.The work done by the net force on a body is equal to the amount that the kinetic energy of the body increases. （ ）
A:错 B:对 5.A bullet of mass m=10g and v=200m/s speed was shot into the wood block. The average resistance of wood blocks is 5000N. Then the depth of bullet entry is （ ）.
A:0.4m B:0.04m C:0.4m D:0.02m