阿摩線上測驗
登入
阿摩線上測驗
登入
試卷名稱：106年 - 學士後西醫物理及化學106物理#77053
年份：106年
科目：學士後西醫物理及化學
52. A solid brass ball of mass 0.280 g will roll smoothly along a loop-the-loop track when released from rest along the straight section. The circular loop has radius R = 14.0 cm, and the ball has radius r << R. What is h if the ball is on the verge of leaving the track when it reaches the top of the loop?
(A) 47.8 cm
(B) 27.8 cm
(C) 57.8 cm
(D) 37.8 cm
(E) 78.3 cm