[填空题]
A marble of mass m and radius sc7mjtq3f(; r-+ygcor hm+ 3qr rolls along t5 m3y35dps rc 3a4mqashe looped rough track of Fig. 8–58. What is the minimum value of the vertical height h that the marble m qrcpsa3sy am53 d5m34ust 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
