如图,内壁光�的玻璃管内用长为l的轻绳悬挂一个小球。当玻璃管绕竖直轴以角速度 匀速转动时,小球与玻璃管间恰无压力。下列说法正确的是( Template


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tomski如图,内壁光�的玻璃管内用长为l的轻绳悬挂一个小球。当玻璃管绕竖直轴以角速度 匀速转动时,小球与玻璃管间恰无压力。下列说法正确的是( coloring