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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
9. A ball of mass m is connected by a string of length L to a pivot fixed in place. A. The ball is originally at rest. A force F applied horizontally to the right on the ball. The force barely balances the gravity and the string tension so that the ball has negligible kinetic energy when it slowly swings up. The string finally makes an angle θ with the vertical line. What is the work done by the force F during this process?
(A) mgL(sinθ)
(B) mgL(1-cosθ)
(C) mgL(cosθ-1)
(D) mgL(cosθ)
(E) 0