[填空题]
A marble of mass m and radius r rolls along th t+1af ce0vq7ss;pz/z e looped rough track of Fig. pw+orimwh;7 *5klh7y 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 withou7ow5km hiyr+7*; lph wt leaving the track? Assume $r\ll R$ and ignore frictional losses. h = R
Post time 2025-2-18 20:00:22
