[填空题]
A marble of mass m an yy3 lftaw l,wk;d*)h-n(n 1ty-obmr6 d radius r rolls along the looped rough track of Fig. 84nhpg c3er/tmul37p 8 nw7e1g–58. What is the minimum value of the vertical height h that the marble must drop if it is ge3ph n /cg4nl8r1m t3u7ep7wto 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
