[填空题]
A marble of mass m and radius r roo , 7j6c,r e2l(sfzkfslls a dzbi.glx 9+5+tq k9khd:p8mn9ape/rlong the looped 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 reach the highest point of the loop without leaving the traekz8:rdh b it+9l/9 kgd95mx.qnpa +pck? Assume $r\ll R$ and ignore frictional losses. h = R
Post time 2025-2-18 20:00:22
