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試卷名稱：114年 - 114 國立清華大學學士後醫學系單獨招生考試_學士後醫學系/智慧資訊科技組：資訊科學#135660
年份：114年
科目：學士後西醫◆資訊科學
1. A bead of mass m is constrained to move on a massless circular hoop of radius R. The hoop is rotating around its center that is aligned in the z-axis (the direction of gravity g) with a constant angular velocity Ω, see figure below. If the hoop is rotating slowly, this system has a stable equilibrium angular velocity of the hoop exceeds a critical 0 becomes unstable. What is the critical angular velocity?
(A)
(B) 
(C) 
(D) 
(E) None of the above