如图所示把质量为m的半球体沿竖直方�切成质量相等的ab部分后它们在水平力f 的作用下紧贴竖直墙壁保持静止状态则块b受到的�擦力大小及 Template




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tomski如图所示把质量为m的半球体沿竖直方�切成质量相等的ab部分后它们在水平力f 的作用下紧贴竖直墙壁保持静止状态则块b受到的�擦力大小及 coloring