[填空题]
A marble of mass m and radius r rolls along thecjhsqyd3zi,-5z8 n7k5 ( mpvo looped rf 7yzalq(8 9gnough track of Fig. 8–58. What is the minimum value of the vertical height h that the marble must drop if it is to reach the highest poing(ylqz f97an8t of the loop without leaving the track? Assume $r\ll R$ and ignore frictional losses. h = R
Post time 2025-2-18 20:00:22
