[填空题]
A marble of mass m and rd+s:h zgsm/ n8p5f8 haadiuzy8md- (/uq6i zx qgt+s r rolls along the looped rough track of Fig. 8–58. What is thg- z+dxi/u q(8yq m6tze minimum 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
