[填空题]
A marble of mass m aneaqs wub6 h:a d4 pt+t: exeo2dg*-n(6d radius r rolls alosig :w2ndzv i 3+).blvo(y-fpng the looped rough track of Fig. 8–58. What is the minimum value of thevifvz)i2ob3 w dns p.:yl+g (- vertical height 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
