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[高考物理模拟题] 甘肃张掖2014年高三物理第五次诊断考试试题附答案(新人教版)
15.如图所示,一根轻杆的两端固定两个质量均为m的相同小球A、B,用两根细绳悬挂在天花板上,虚线为竖直线,α=θ=30°β=60°,求轻杆对A球的作用力。( )A.mg B.mgC.mg D.mg2014-06-05 编辑:max
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2014-06-05 编辑:max