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【简答题】
一个水平面上的弹簧振子,倔强系数为k,振子的质量为M,作无阻尼的简谐振动,当它到达平衡位置时,有一块粘土(质量为m)从高度h处自由下落,正好落在物体M上,并随之一起运动.问: (1) 振动的周期变为多少?是原来的多少倍? (2) 振幅有何变化?
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