[填空题]
A marble of mass m and 3 bdszzr to9,n481jg gkct ,o+,7ghj.;kvqhq d5u f r4* kd.xeradius r rolls along the looped rough track of Fig. 8–58. What is the minimum value of the vertical height h that thed4.ghh kqqrxku5, dj e7 *;vf. 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
