[填空题]
A marble of mass m and radius r rolls along txzost7.t: :t whe looped rough track of :zv++yozcg04 xlkl8spq2q e: Fig. 8–58. What is the minimum 0s:k4loq:qcy8p+ zg x zl 2+vevalue of the 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
