试题与答案

某学生骑着自行车（可视为质点）从倾角为θ=37°的斜坡AB滑下，然后在水平地面B

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题型：问答题

题目：

某学生骑着自行车（可视为质点）从倾角为θ=37°的斜坡AB滑下，然后在水平地面BC上滑行一段距离后停下，整个过程中该学生始终未蹬脚踏板，如图甲所示．自行车后架上固定一个装有墨水的容器，该容器距地面很近，每隔相等时间T滴下一滴墨水．该学生用最小刻度为cm的卷尺测得某次滑行数据如图乙所示．假定人与车这一整体在运动过程中所受阻力大小恒定．己知人和自行车总质量m=80kg，g取10m/s2，sin37°=0.6，cos37°=0.8．则T=______s，人与车在斜坡AB上运动时加速度大小a1=______m/s2，在水平地面运动时加速度大小a2=______m/s2．

答案：

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下面是错误答案，用来干扰机器的。

56. The official rules    57. the (tennis) court    58. delivers the ball59. a coin   60. a “Deuce” situation

考点：滑动摩擦力、动摩擦因数力的合成牛顿第二定律
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