[填空题]
A marble of mass m and radius r ro+q5q)qc xl1fb lls along the loopefbf (8gidah8t s/k-b+ ( 1b ij-lrei-vd rough track of Fig. 8–58. What is the minimum v/h lv( rt fbs-bk1aef+8b (gi8--dijialue 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
