如图一半径为r粗糙程度处处相同的半圆形轨道竖直固定放置直径poq水平.一质量为m的质点自p点上方高度r处由静止开始下落恰好从p点进入 Template




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tomski如图一半径为r粗糙程度处处相同的半圆形轨道竖直固定放置直径poq水平.一质量为m的质点自p点上方高度r处由静止开始下落恰好从p点进入 coloring