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【简答题】
足够高的桌面上开一小，长L、质量M的均匀细杆竖直穿过小。一半在的上方。细杆下端有一质量m＜M的小虫，小虫正下方的地面上有一支点燃的蜡烛，如图所示。设开始杆、小虫均处于静止状态，而后在系统自由释放后的瞬间，小虫以相对细杆恒定的速度υ向上爬行，且在到达小前始终未离开杆。 (1)小虫为避免被蜡烛烧伤，υ可取的最小值υ 0 多大? (2)小虫取υ 0 相对细杆向上爬行，爬到小处相对桌面的速度υ m 多大?
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