[填空题]
A marble of mass m andp9m.(m/)e z(u y oiokx rnse.8bhr ob ;)adius r rolls along the looped rough 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 higbbo8snh.r) ;ehest 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
