[填空题]
A marble of mass m and rad/xme9k*+y v j8fh u2btius rl 95k:cmyg(+ja qmv q,r1 hs .d*4pzdm rolls along 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 (zahp,:+ *.q vls95cm1jdkg mmryd4qhighest 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
