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如图,墙上有两个钉子a和b,它们的连线与水平方向的夹角为45°,两者的高度差为l...
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如图,墙上有两个钉子a和b,它们的连线与水平方向的夹角为45°,两者的高度差为l.一条不可伸长的轻质细绳一端固定于a点,另一端跨过光滑钉子b悬挂一质量为m
1的重物.在绳子距a端
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得c点有一固定绳圈.若绳圈上悬挂质量为m
2的钩码,平衡后绳的ac段正好水平,则重物和钩码的质量比
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为( )
A.
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B.2
C.
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D.
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