一个内壁光滑的圆环型细管,正绕竖直光滑固定轴 OO′自由转动。刚性的,环半径为R 。一质量为 m 的小球静止于最高点A处,如图所示。由于微小扰动,小球向下滑动,试判决小球在下滑过程中,下列三种说法是否正确,并说明理由。 小球对OO′轴的角动量守恒。
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