[填空题]
A marble of mass m and rad5b*sst byyo(zbrla xqz(9f 1+7m gl1- ius r roll2(m05vpk c ogns 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 wik 2co (pn05mvgthout leaving the track? Assume $r\ll R$ and ignore frictional losses. h = R
Post time 2025-2-18 20:00:22
