[填空题]
A marble of mass m and radius r rolls ajn0 :pwdl- 0;* bulye -lwhh,hlong the looped6m2n g.tmx ut( rough track of Fig. 8–58. What is the minimum value of the vertical height h that the marble must drop uxgn6t2t.m(m 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
