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5.下列哪一情況,力對物體作功不為零 (A)單擺運動中,繩子的張力所做的功 (B)單擺運動中,重力所做的功 (C)物體沿斜面下滑,正向力所做的功 (D)等速度運動的物體,合力所做的功。
問題詳情
5.下列哪一情況,力對物體作功不為零
(A)單擺運動中,繩子的張力所做的功
(B)單擺運動中,重力所做的功
(C)物體沿斜面下滑,正向力所做的功
(D)等速度運動的物體,合力所做的功。
參考答案
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11.( )臺灣雨量充足,降雨量達全球平均的三倍,但有時也會出現缺水的乾旱期。下列哪一項不是造成臺灣地區缺水的主要原因?(A)降雨時間短而集中 (B)山多平原少 (C)河流短且地形陡峭 (D)臺
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6.大仲家的馬達功率是5瓩,如果要將10立方公尺的水抽到15公尺高的水塔,大仲家的馬達所花的時間是多少?(g=10 m/s2) (A)300秒 (B)3×105秒 (C)300分 (D)3×105 分
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