問題詳情
7. 一質點以O為圓心在一水平面上作等速率圓周運動，其速率為v，如圖二所示。甲、乙、丙、丁、戊皆在圓周上，如果以甲點為參考點測量質點的角動量，則該質點角動量隨時間變化率的量值在圖中哪一處最小？
(A)乙
(B)丙
(C)丁
(D)戊
參考答案
答案：C
難度：困難0.333333
統計：A(2),B(0),C(1),D(0),E(0)
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