22.如图所示ab是倾角为的粗糙直轨道bcd是光�的圆弧轨道ab恰好在b点与圆弧相切圆弧的半径为r.一个质量为m的物体从直轨道上的某处 Template




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tomski22.如图所示ab是倾角为的粗糙直轨道bcd是光�的圆弧轨道ab恰好在b点与圆弧相切圆弧的半径为r.一个质量为m的物体从直轨道上的某处 coloring