College Physics答案2023

第七章测试

1.A 2-kg particle moves for rest due to a 10-N net force. In 5 s, what is final moment of the particle.（ ）
A: B: C: D:
答案:C
2.A 5-kg block with a velocity collides with a 10-kg block at rest. If it is a perfectly inelastic collision, what is the final velocity of the two blocks.（ ）
A: B: C: D: 3.In elastic collision, which of the following physics quantities are conserved. （ ）
A:kinetic energy of each particle B:momentum of the system C:momentum of each particle D:kinetic energy of the system 4.If the momentum is conserved for a system, which of the following statements are correct. （ ）
A:zero external force acting on the system B:no internal forces in the system C:zero force acting on each particle D:internal forces on each other forming action-reaction pairs 5.For conservation of momentum, the internal forces can only be conservative forces. （ ）
A:对 B:错