Newton&39;s laws of motion PhO(2)

5. (03.11)

Car A ran the red light and hit Car B which had the right of way at the intersection. Car A was more severely damaged than Car B, but fortunately no one was injured. You are to investigate the accident and decide which of the following statements is correct.

A. Driver of Car A was at fault because Car A collided with Car B before Car B collided with Car A.

B. Driver of Car A was at fault even though both cars collided at the same moment. C. Both drivers were at fault because both cars collided at the same moment.

D. Driver of Car B was at fault because Car B exerted more force on Car A, and as a result, car A was damaged more.

E. Driver of Car A was at fault because being the initiator Car A exerted more force on Car B. 6. (03.15)

In Newtonian mechanics the upper limit of speed any object could reach under constant action of a force F is ___. In Relativistic mechanics, however, the mass of an object is no longer a constant, but changes with the speed v of the object in the following way: m =Here c is the speed of light in vacuum,

and m0 is the mass when the object is at rest. Therefore, the maximum speed the object under constant action of force could reach is ___. A. , B. F/m, F/m0 C. F/ m0, F/m D. c, E. , c

7.(04.10)

We have seen on TV how the astronauts were trained in weightless condition in a large airplane. To achieve weightless condition the plane should ___. (A) Dive downwards at constant velocity

(B) Dive downwards at constant acceleration that is equal to g (C) Accelerate in horizontal direction (D) Move upwards at constant velocity

(E) Move upwards at constant acceleration that is equal to g

mo1v2

/c

2

搜索“diyifanwen.net”或“第一范文网”即可找到本站免费阅读全部范文。收藏本站方便下次阅读，第一范文网，提供最新工程科技Newton&39;s laws of motion PhO(2)全文阅读和word下载服务。