[填空题]
A marble of mass m and rady9:g4m 8;k d efhg6zzfp7x:hoius r rolls alori8 -7yyo(qo bx9pg6bng 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 89 poqy -(ixbr7ygb6o to reach 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
