[填空题]
A marble of mass m a2 9l (jqng*aiup7xeg8ne 6 m9q9scvf*)zru.ynd 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?uzs qermc9n *.f6v)y9 Assume $r\ll R$ and ignore frictional losses. h = R
Post time 2025-2-18 20:00:22
