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一质量为m的匀质细杆AB，A端靠在粗糙的竖直墙壁上，B端置于粗糙的水平地面上而精止，杆身与竖直方向成θ角，则A端对墙壁的压力大小为

A、1373957432343.jpg

B、1373957439609.jpg

C、1373957446625.jpg

D、不能唯一确定

时间：2021-09-01 23:34 关键词：青书学堂黑龙江省教育学院原子物理学（专升本）

答案解析

D

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一质量为m的匀质细杆AB，A端靠在粗糙的竖直墙壁上，B端置于粗糙的水平地面上而精止，杆身与竖直方向成θ角，则A端对墙壁的压力大小为