[填空题]
A marble of mass m and radius r r0 .7: h8iwbrlfzsfh 3ru7ik1l olls along the looped rough+bq ip0(5f,spsen/w e track of Fig. 8–58. What is the minimum value of the vertical height h that the marble must drop if itsn( bw5pf iqep ,0se+/ 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
