[填空题]
A marble of mass m an1e a(qce6 igl67h jhc9 jkob:4d r/tiitw z(32*8dhg 4 r txsz*cdadius r rolls along the looped rough track of Fig. 8–58. What is the mw3*4x(tz2* / cs dztgtirih8dinimum value of the vertical height 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
