[填空题]
A marble of mass m and zf+ e j9f(ih bwd-0gk:radius r rolls along t 4e*:5igxkd szhe looped rough track of Fig. 8–58. What is the minimum value of 5x e:k4g*idzsthe vertical height h that the marble 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
