[填空题]
A marble of mass m and radius r rolls ay0f:8q pb.zoklong the looped rough trac5hmgr /ts3*cc ojf).4cmqh * hk of Fig. 8–58. What is the minimum value of the vertical height h that the marble must drct c *oj 3m. )fmr/hchgh45q*sop 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
