[填空题]
A marble of mass m and rad3hcj5icnces4 ,y 5t g4ius r rolls along the looped rough tdq37zse,ijbt n , 0mj0rack of Fig. 8–58. What is the minimum value of the vertical height h that the marble must drop if it is to d,t0j7n 30smq,eb zijreach the highest point 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
