[填空题]
A marble of mass m and radius r rolls along r: glx 09m 5zhz 4nw3lg60xatrthe loopedab bf*k71ue)q rough track of Fig. 8–58. What is the minimum value of the vertical height h that the marbleqbf1aue* k )b7 must drop if it is 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
