[填空题]
A marble of mass m and raoodz5hyhf2g .+ 0* uyfdi tb((upx2p4t cus r rolls along the looped rough track of Fig. 8–58. What is the minimum value of p4c t2 (xp(tbuthe 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
