[填空题]
A marble of mass m and radius r rollsc ;,k8-irin kp along the looped rough 7.b2l8;*djfpld w op*8a8 ycfie ruc: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 point of the loop without leaving the tl8 b*p:.f2*8 woc j ;a8prueyilc7dd frack? Assume $r\ll R$ and ignore frictional losses. h = R
Post time 2025-2-18 20:00:22
