[填空题]
A marble of mass m and radius r rolls along3 dtx.5;xksnz they*vhq :t1 ki .i+lw4ics3vbx 6 looped rough track of Fig. 8–58. What is the minimum value of the vertical height h that the marble 6:qiv+ 1xvc3 h wibtlki.sy*4 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
