做简谐运动的单摆,其摆长不变,若摆球的质量增加为原来的 4 ( 9 ) 倍,摆球经过平衡位置的速度减为原来的 3 ( 2 ) ,则单摆振动的 ( ) A .周期不变,振幅不变 B .周期不变,振幅变小 C .周期改变,振幅不变 D .周期改变,振幅变大
A.
1
B.
2
C.
3
D.
4
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