[填空题]
A marble of mass m and radius rr,4w bjw0y.(r tqudfo- u-jm4 rolls along the lonye k8tjt:t;1 *0rng joped rough track of Fig. 8–58. What is the minimum value of the vertical height h that the marble must drop if it is to reachte:rk0gjt;y* jtn1 n8 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
