[填空题]
A marble of mass m an6ko*jt (-fdv m x:g:qxe 7hz6md radius r r5ljj 6l xp23+w alym)4zgfb5 p*g4zgtolls along the looped rough track of Fig. 8–58. What is thebll4+pzyt2 l*m4wg 536 zp)gg fxaj5 j 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 $r\ll R$ and ignore frictional losses. h = R
Post time 2025-2-18 20:00:22
