[填空题]
A marble of mass m and radius r rvaeutl3+;5 nmol-7 e)jjvumk b5ls along the looped rough track of Fig. 8–58. What is the minimum uj kvb 5mj)e7-value 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
