14.是竖直平面内的四分之一圆弧轨道在下端b与水平直轨道相切如图所示一小球自a点起由静止开始沿轨道下�已知圆轨道半径为r小球的质量为 Template




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tomski14.是竖直平面内的四分之一圆弧轨道在下端b与水平直轨道相切如图所示一小球自a点起由静止开始沿轨道下�已知圆轨道半径为r小球的质量为 coloring