[填空题]
A marble of mass m and radius r rolls along the l )d9xss*b2wdm7ek st,ooped rough track oq 5 l;kjl0mp ,gf,56x6w,y t-ll lveyyf Fig. 8–58. What is the minimum value of the vertical height,gym yl, l,0-kl;tjq5fel xwly6v p 56 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
