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问题 计算题

（2）（9分）甲、乙两个小球在水平光滑直轨道上向同方向运动，已知它们的动量分别是P1=5kg·m/s，P2=7kg·m/s。甲从后面追上乙并发生碰撞，碰后乙球的动量变为P2’=10kg·m/s。求两球质量m甲与m乙满足怎样的关系？

答案

题目分析：设两球发生的是弹性碰撞，则碰撞过程动量守恒并且机械能守恒．由于物体动能与动量间满足关系式         ，因此               

代入数据解出                   

如果是完全非弹性碰撞，则碰后二者速度大小相等，由所以                   

代入数据解出               

综上所述，两小球的质量间的关系必须满足．．．

多项选择题

下列对被毒蛇咬伤患者进行的急救与护理中，正确的是( )

A．尽早结扎

B．冲洗伤口

C．针刺排毒

D．1:5000呋喃西林溶液湿敷伤口

E．局部使用中草药或口服中药
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问答题

Andrew is a member of the board of directors of AP Limited. On Andrew’s insistence, six months ago AP Limited terminated a contract with BB Limited which provided IT support to AP Limited; two weeks later, AP Limited engaged ZZ Limited to provide IT support services to AP Limited. Andrew did not inform the board of directors of AP Limited that his girlfriend owned 40% of the shares of ZZ Limited and is a director of the same company; in fact he actively participated at the board of directors meeting at which it was decided that the contract for IT support services be awarded to ZZ Limited. Two months ago Andrew was appointed a member of the board of directors of ZZ Limited and he did not inform the board of directors of AP Limited of this fact. The board of directors of AP Limited has recently become aware of all these facts and come to you for advice.Required:

(b) Explain what action may be taken against Andrew for his failure to make the necessary disclosures to the board of directors. (2 marks)
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