[填空题]
A marble of mass m and radius r rolls along the loopedr1 pvprumhl5 91(y8;eob:kz(pnsa t0 rd fh0wfvqt 2l;6 2koe3ough track of Fig. 8–58. What is the minimum value of the vertical lhqv02 tkofe26dw; 3f 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
