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4 有一旋轉輪,輪中心有一鉛直轉軸。輪旋轉時,由上方觀察,轉輪旋轉方向是逆時鐘。試問,輪的 角動量的方向為何?(A)鉛直向上 (B)鉛直向下(C)沿輪圓周的切線方向,且與旋轉方向相反 (D)沿輪圓周的
問題詳情
4 有一旋轉輪,輪中心有一鉛直轉軸。輪旋轉時,由上方觀察,轉輪旋轉方向是逆時鐘。試問,輪的 角動量的方向為何?
(A)鉛直向上
(B)鉛直向下
(C)沿輪圓周的切線方向,且與旋轉方向相反
(D)沿輪圓周的切線方向,且與旋轉方向相同
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39. 能量轉換效率為何?(A)≥1 (B)≤1(C)=1 (D)<0
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