题目内容

将细绳绕在一个具有水平光滑轴的飞轮边缘上,现在在绳端挂一质量为m的重物,飞轮的角加速度为a.如果以拉力2mg代替重物拉绳时,飞轮的角加速度将

A. 小于a
B. 大于a,小于2 a
C. 大于2a
D. 等于2a

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