试题与答案

Bobby was a dog that went every moming t

题型:改错题

题目:

Bobby was a dog that went every moming to a baker's shop to fetch twelve bread roll for its owner. However. when Bobby returned back one day, it had only eleven rolls. Bobby's owner wants to know what had happened, but he followed Bobby to the baker's shop the next day Instead taking the road home as usually. Bobby took another road and went up to a farm. There was a poorer little dog with a broken leg. Bobby was offered the roll to the little dog. The owner was very proud of Bobby and rewarded itself a nice big bone. Later, the owner's family never grew tired of tell everybody how kind and clever Bobby was

答案:

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参考答案:A

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题型:计算题

如图所示,长,高,质量的长方体木箱,在水平面上向右做直线运动。当木箱的速度时,对木箱施加一个方向水平向左的恒力,并同时将一个质量的小球轻放在距木箱右端的P点(小球可视为质点,放在P点时相对于地面的速度为零),经过一段时间,小球脱离木箱落到地面。木箱与地面的动摩擦因数为0.2,其他摩擦均不计。取。求:

(1)小球从离开木箱开始至落到地面所用的时间;

(2)小球放上P点后,木箱向右运动的最大位移;

(3)小球离开木箱时木箱的速度。

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