如图所示,均匀细杆AB质量为M,A端装有转轴,B端连接细线通过滑轮

如图所示,均匀细杆AB质量为MA端装有转轴,B端连接细线通过滑轮和质量为m的重物C相连,若杆AB呈水平,细线与水平方向夹角为q 时恰能保持平衡,则杆对轴A有作用力大小下面表达式中正确的有:(     

Amg                         B

Cg       DMgmg sin q

答案

 ABC

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