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质量为,长为的均匀细棒,可绕垂直于棒的一端的光滑水平轴转动,如将此棒放在水平位置,然后任其开始转动,则开始转动时的角加速度为: ( )

单选题
2021-09-01 23:39
A、65 ;
B、75 ;
C、80
D、60 。
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正确答案
B

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