工人用如图所示的滑轮组将一重400N的物体匀速提起,若滑轮组的机械效率为80%,忽略一切摩擦及绳的伸长,则则拉力的大小是 N,动滑轮重 N;若使用该滑轮组提升600N的重物,其机械效率将 (选填
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![工人用如图所示的滑轮组将一重400N的物体匀速提起,若滑轮组的机械效率为80%,忽略一切摩擦及绳的伸长,则则拉力的大小是 N,动滑轮重 N;若使用该滑轮组提升600N的重物,其机械效率将 (选填](/uploads/image/z/1519057-1-7.jpg?t=%E5%B7%A5%E4%BA%BA%E7%94%A8%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E7%9A%84%E6%BB%91%E8%BD%AE%E7%BB%84%E5%B0%86%E4%B8%80%E9%87%8D400N%E7%9A%84%E7%89%A9%E4%BD%93%E5%8C%80%E9%80%9F%E6%8F%90%E8%B5%B7%2C%E8%8B%A5%E6%BB%91%E8%BD%AE%E7%BB%84%E7%9A%84%E6%9C%BA%E6%A2%B0%E6%95%88%E7%8E%87%E4%B8%BA80%25%2C%E5%BF%BD%E7%95%A5%E4%B8%80%E5%88%87%E6%91%A9%E6%93%A6%E5%8F%8A%E7%BB%B3%E7%9A%84%E4%BC%B8%E9%95%BF%2C%E5%88%99%E5%88%99%E6%8B%89%E5%8A%9B%E7%9A%84%E5%A4%A7%E5%B0%8F%E6%98%AF+N%2C%E5%8A%A8%E6%BB%91%E8%BD%AE%E9%87%8D+N%EF%BC%9B%E8%8B%A5%E4%BD%BF%E7%94%A8%E8%AF%A5%E6%BB%91%E8%BD%AE%E7%BB%84%E6%8F%90%E5%8D%87600N%E7%9A%84%E9%87%8D%E7%89%A9%2C%E5%85%B6%E6%9C%BA%E6%A2%B0%E6%95%88%E7%8E%87%E5%B0%86+%EF%BC%88%E9%80%89%E5%A1%AB)
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