[填空题]
A marble of mass m an of9+j7u 9j*brok 6wcbm/i* xrd raod6 w4 v(5om7x tw+yovdius 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 is m wy7 o 5o4otvd+(x6wvto 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
