[填空题]
A marble of mass m and 5ahv 4 ecop39k (eqzc)radius r rolls along t2y1o9dyq u s ma-xj5x1he looped rough track of Fig. 8–58. What is the minimum value of 91umd1xsojy qy- 2x5athe vertical height h that the marble must drop 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
