[填空题]
A marble of mass m and radius r rolls alo50akn 7sw.wg qng the 0p5t 2wvrl7bpk+yvb;rg54b z looped rough track of Fig. 8–58. What is the minimum value of the vertical height h that the marblzyg 4 b0 27pwv+lb;vr55krpbt e 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
