用滑轮组拉着600N的重物A水平匀速移动,如图,40秒内移动了8米,拉力F做功1280J.问:若动滑轮重12N,不计绳重和摩擦,求滑轮组机械效率.
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![用滑轮组拉着600N的重物A水平匀速移动,如图,40秒内移动了8米,拉力F做功1280J.问:若动滑轮重12N,不计绳重和摩擦,求滑轮组机械效率.](/uploads/image/z/2389628-20-8.jpg?t=%E7%94%A8%E6%BB%91%E8%BD%AE%E7%BB%84%E6%8B%89%E7%9D%80600N%E7%9A%84%E9%87%8D%E7%89%A9A%E6%B0%B4%E5%B9%B3%E5%8C%80%E9%80%9F%E7%A7%BB%E5%8A%A8%2C%E5%A6%82%E5%9B%BE%2C40%E7%A7%92%E5%86%85%E7%A7%BB%E5%8A%A8%E4%BA%868%E7%B1%B3%2C%E6%8B%89%E5%8A%9BF%E5%81%9A%E5%8A%9F1280J.%E9%97%AE%EF%BC%9A%E8%8B%A5%E5%8A%A8%E6%BB%91%E8%BD%AE%E9%87%8D12N%2C%E4%B8%8D%E8%AE%A1%E7%BB%B3%E9%87%8D%E5%92%8C%E6%91%A9%E6%93%A6%2C%E6%B1%82%E6%BB%91%E8%BD%AE%E7%BB%84%E6%9C%BA%E6%A2%B0%E6%95%88%E7%8E%87.)
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