4.如图所示光�半球的半径为r球心为o其上方有一个光�曲面轨道ab高度为r2.轨道底端水平并与半球顶端相切.质量为m的小球由a点静止 Template




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tomski4.如图所示光�半球的半径为r球心为o其上方有一个光�曲面轨道ab高度为r2.轨道底端水平并与半球顶端相切.质量为m的小球由a点静止 coloring