[填空题]
A marble of mass m and radius r rolls along the looped rouhor*-, n+rs-dm; q e(-abcluegh track of Fig. 8–5bki47 q7qk)dnmw+d8h 8 mf l+h8. What is the minimum value of the vertical height h th+nwmf88d7ik qhmq ) bh4k d7l+at 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
