如图所示的装置提升重1.4*104N的货物A货物A的体积为0.2m3,当货物A完全浸没在水中时,货物A在2s内匀速升高1m,绳端C处拉力F的功率P=7.5kW.(忽略绳重和轴摩擦,g=10N/kg),当货物A完全出水后,在空气中被
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![如图所示的装置提升重1.4*104N的货物A货物A的体积为0.2m3,当货物A完全浸没在水中时,货物A在2s内匀速升高1m,绳端C处拉力F的功率P=7.5kW.(忽略绳重和轴摩擦,g=10N/kg),当货物A完全出水后,在空气中被](/uploads/image/z/3816588-12-8.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E7%9A%84%E8%A3%85%E7%BD%AE%E6%8F%90%E5%8D%87%E9%87%8D1.4%2A104N%E7%9A%84%E8%B4%A7%E7%89%A9A%E8%B4%A7%E7%89%A9A%E7%9A%84%E4%BD%93%E7%A7%AF%E4%B8%BA0.2m3%2C%E5%BD%93%E8%B4%A7%E7%89%A9A%E5%AE%8C%E5%85%A8%E6%B5%B8%E6%B2%A1%E5%9C%A8%E6%B0%B4%E4%B8%AD%E6%97%B6%2C%E8%B4%A7%E7%89%A9A%E5%9C%A82s%E5%86%85%E5%8C%80%E9%80%9F%E5%8D%87%E9%AB%981m%2C%E7%BB%B3%E7%AB%AFC%E5%A4%84%E6%8B%89%E5%8A%9BF%E7%9A%84%E5%8A%9F%E7%8E%87P%3D7.5kW.%28%E5%BF%BD%E7%95%A5%E7%BB%B3%E9%87%8D%E5%92%8C%E8%BD%B4%E6%91%A9%E6%93%A6%2Cg%3D10N%2Fkg%29%2C%E5%BD%93%E8%B4%A7%E7%89%A9A%E5%AE%8C%E5%85%A8%E5%87%BA%E6%B0%B4%E5%90%8E%2C%E5%9C%A8%E7%A9%BA%E6%B0%94%E4%B8%AD%E8%A2%AB)
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