[填空题]
A marble of mass m and radius r r40+9aw7:nbkivn spzgeu6 1f golls along thfwh,2sbm0 1.:kmg ujr hsae;(e looped rough track of Fig. 8–58. What is the minimum value of the vertical heigh,:;haj mhew( mkssg21u.fr 0bt 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
