[填空题]
A marble of mass m and radius yc,c j1) *kfng(gawy *r rojdz t9dxvi1, nk-z. 2 x8oadi.lls along the looped rough track of Fig. 8–58. What is the minimum valuiox9 ,dzndt vazj2i8..xd1 -ke 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 $r\ll R$ and ignore frictional losses. h = R
Post time 2025-2-18 20:00:22
