[填空题]
A marble of mass m and ry * k9ty1v 8wt/ug-dhqofpax;-g gl5nij(.5xadius r jb,f g gp65/kmrolls along the looped rough track of Fig. 8–58. What is the minimum value of the vertical height h that the marble must d6/kjfmg b g5p,rop 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
