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【简答题】
一质量均匀分布的圆盘,质量为M,半径为R,放在一粗糙水平面上(圆盘与水平面之间的摩擦因数为 ),圆盘可绕通过其中心O的竖直固定光滑轴转动。开始时,圆盘静止,一质量为m的子弹以水平速度 垂直于圆盘半径打入圆盘边缘并嵌在盘边上。求: (1) 子弹击中圆盘后,获得的角速度; (2) 经过多少时间后,圆盘停止转动。(圆盘绕过O的竖直轴的转动惯量为 ,忽略子弹重力造成的摩擦阻力矩。)
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