[填空题]
A marble of mass m an j;z;wd)-wpd8thh; dp:fqz /id radius r rolls along the looped roug v+fltjxw(o 8 (1r9deah track of Fig. 8–58. What is the minimum value of the vertical height h that the marble must drop if it is to reach the highest potj f1ox v+(aewd(r8l9 int 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
