试题与答案

如图所示,光滑水平面上放置质量分别为m、2m和3m的三个木块,其中质量为2m和3

题型:选择题

题目:

如图所示,光滑水平面上放置质量分别为m、2m和3m的三个木块,其中质量为2m和3m的木块间用一不可伸长的轻绳相连,轻绳能承受的最大拉力为T.现用水平拉力F拉其中一个质量为3m的木块,使三个木块以同一加速度运动,则以下说法正确的是(  )

A.质量为2m的木块受到四个力的作用

B.当F逐渐增大到T时,轻绳刚好被拉断

C.当F逐渐增大到1.5T时,轻绳还不会被拉断

D.轻绳刚要被拉断时,质量为m和2m的木块间的摩擦力为 T

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D解析: 《中华人民共和国地方各级人民代表大会和地方各级人民政府组织法》第6条规定:地方各级人民代表大会每届任期五年。B镇第六届人民代表大会代表的任职期1998年3月至2003年3月,故选D。

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