問題詳情
有一玩具飛機懸吊在一條細繩下端，繞水平圓形軌道做等速率運動，
8.如附圖所示，則下列敘述何者正確？
(A)飛機的速度保持不變
(B)飛機的加速度指向前進方向
(C)飛機所受向心力的方向指向繩子拉力的方向
(D)飛機瞬間的運動方向為圓形軌道的切線方向。
參考答案
答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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