如图所示，由两种材料做成的半球面固定在水平地面上，球右侧面是

更新 2022-09-03
科目物理
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如图所示，由两种材料做成的半球面固定在水平地面上，球右侧面是光滑的，左侧面粗糙，O点为球心，A、B是两个相同的小物块（可视为质点），物块A静止在左侧面上，物块B在图示水平力F作用下静止在右侧面上，A、B处在同一高度，AO、BO与竖直方向的夹角均为θ，则A、B分别对球面的压力大小之比为

A．sinθ：1 B．sin²θ：1
C．cosθ：1 D．cos²θ：1

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