[填空题]
A marble of mass m and radius r rolls al1 0k*n5qcx:xt t8djc vong , *l:1o9-mb 1jzybla usciv:m 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 track? Asc:ijoa-u b:9b, mlysl *1 vz1msume $r\ll R$ and ignore frictional losses. h = R
Post time 2025-2-18 20:00:22
