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问题 选择题

一个做匀速圆周运动的物体，当F合突然小于mω2r时（   ）

A．将沿切线方向做匀速直线运动而飞出

B．将做靠近圆心的曲线运动

C．将做远离圆心的曲线运动

D．将做平抛运动

答案

答案：C

由于F合突然小于mω2r，即物体所受的合外力不足以提供它做匀速圆周运动所需的向心力，所以它将做远离圆心的曲线运动.

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选择题

We shouldn't have come north for Christmas vacation. If we _______, we wouldn't be stuck in the snow right now.

A．wasn't

B．didn't

C．hadn't

D．weren't
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