[填空题]
A marble of mass m aq/blr: 0wxqzu )0 20s:nweqj fl f t(6pjci)3s; 5ozlznd radius r rolls along the looped 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 point of the loop without leaving the track? Assume jpco ti5z(l s f)l;z36$r\ll R$ and ignore frictional losses. h = R
Post time 2025-2-18 20:00:22
