[填空题]
A marble of mass m and rfk *l-pm*rn (radius r rolls along the e3bkv9lax -ja 3;rxyo2rd,k +looped rough track of Fig. 8–58. What is the minimum value of the vertical height h that the marble must drop irxklea+v,d9ja rky 2b ;x -3o3f 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
