半径为 R 的圆盘沿水平地面作纯滚动,一质量为 m 、长为 R 的均质杆如图固结在圆盘上,当杆处于铅垂位置瞬时,圆盘圆心有速度 v 和加速度 a 。则图示瞬时,杆的惯性力系中心简化的结果为 ____________ 。
A.
B.
C.
D.
D
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B.
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C.
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D.
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