如图所示一光�的半径为r的半圆形轨道放在水平面上一个质量为m的小球以某一速度冲上轨道当小球将要从轨道口b点飞出时小球对轨道的压力恰好为 Template




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tomski如图所示一光�的半径为r的半圆形轨道放在水平面上一个质量为m的小球以某一速度冲上轨道当小球将要从轨道口b点飞出时小球对轨道的压力恰好为 coloring