如图所示半径为r表面光�的半圆柱体固定于水平地面其圆心在o点.位于竖直面内的曲线轨道ab的底端水平与半圆柱相切于圆柱面顶点b.质量为m Template




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tomski如图所示半径为r表面光�的半圆柱体固定于水平地面其圆心在o点.位于竖直面内的曲线轨道ab的底端水平与半圆柱相切于圆柱面顶点b.质量为m coloring