問題詳情

22. A pendulum consists of a 0.500 kg mass on the end of a light rod 50.0 cm long. It was setswinging so that the greatest angle the rod makes with the vertical was 30.0º. After 5 hours and30 minutes it was seen to come to rest at its lowest position. How much work was done on thependulum by the frictional forces? (Answer in J)
(A) – 1.225
(B) – 0.825
(C) + 0.450
(D) – 0.328

參考答案

答案:D
難度:非常困難0
統計:A(0),B(0),C(1),D(0),E(0)

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