[填空题]
A marble of mass m and radbie .k q968x bt:8hhgd9,dlyrius r 1vlvc0d3 * auo:q+esdy9/ wr brolls along the looped rough track of Fig. 8–58. What is the minimum value of the vertical height h that the marble must drod e ws9qr3v*ovyc0:1ud /l+bap 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
