[填空题]
A marble of mass m aw0b bn7m es*9 f7jy6x;6cue,y7laogi nyc pp26 sw9:(.wtj )hj(cwkuwd radius r 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 ip 92w w((6:.kus pywj)chjwtc s 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
