11.如图所示半径r=0.9m的光�的半圆轨道固定在竖直平面内直径ac竖直下端a与光�的水平轨道相切.一小球沿水平轨道进入竖直圆轨道 Template




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tomski11.如图所示半径r=0.9m的光�的半圆轨道固定在竖直平面内直径ac竖直下端a与光�的水平轨道相切.一小球沿水平轨道进入竖直圆轨道 coloring