[填空题]
A marble of mass m and radius r rolls along the looped rough track ofva.a a56vu3zk y0weg) Fig. 8–e 7-iqkw*j;rue: ,k2/rt ynf t58. 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?nrr q-7fe :2witk*,yu/ kj;et Assume $r\ll R$ and ignore frictional losses. h = R
Post time 2025-2-18 20:00:22
