[填空题]
A marble of mass m and )b2.ml dzco j vyyg/wxm 0ro)- vp0)9xradius r rolls along the looped a*wl:y1lr)w l rough track of Fig. 8–58. What is the minimum value of the vertical height h that the marble must drop if it is to reach the highest poin*l: 1)wy rlwalt 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
