[填空题]
A marble of mass m and egbhixp *2j50w1 rm 4aradius r rolls alongi1:5fr *nlx+d.n xmzt the looped rough track of Fig. 8–58. What *+t f5nx r :1zilmdx.nis the minimum 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
