[填空题]
A marble of mass m and radius jvr39ds ha:bi s;f5p4r rolls along t7p 2pt,i(ygekif:) rl he 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 highest point of the loop wik2(ey tpg : l7)fipr,ithout leaving the track? Assume $r\ll R$ and ignore frictional losses. h = R
Post time 2025-2-18 20:00:22
