[填空题]
A marble of mass m and raf j18xo6aha 2axu.c0jdius r rolls along the looped rough track of Fig. 8–yku kv3t)1tg 758. What is the minimum value of the vertical height h that the marble must dygtku7t )vk13rop 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
