用一个滑轮组在6s内把84N的重物匀速提升2m时,在绳的自由端所加拉力大小为40N,自由端通过的距离为6m.在此过程中,有用功为( )J,拉力做功的功率为( )W,滑轮组的机械效率为( )
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![用一个滑轮组在6s内把84N的重物匀速提升2m时,在绳的自由端所加拉力大小为40N,自由端通过的距离为6m.在此过程中,有用功为( )J,拉力做功的功率为( )W,滑轮组的机械效率为( )](/uploads/image/z/10004260-4-0.jpg?t=%E7%94%A8%E4%B8%80%E4%B8%AA%E6%BB%91%E8%BD%AE%E7%BB%84%E5%9C%A86s%E5%86%85%E6%8A%8A84N%E7%9A%84%E9%87%8D%E7%89%A9%E5%8C%80%E9%80%9F%E6%8F%90%E5%8D%872m%E6%97%B6%2C%E5%9C%A8%E7%BB%B3%E7%9A%84%E8%87%AA%E7%94%B1%E7%AB%AF%E6%89%80%E5%8A%A0%E6%8B%89%E5%8A%9B%E5%A4%A7%E5%B0%8F%E4%B8%BA40N%2C%E8%87%AA%E7%94%B1%E7%AB%AF%E9%80%9A%E8%BF%87%E7%9A%84%E8%B7%9D%E7%A6%BB%E4%B8%BA6m.%E5%9C%A8%E6%AD%A4%E8%BF%87%E7%A8%8B%E4%B8%AD%2C%E6%9C%89%E7%94%A8%E5%8A%9F%E4%B8%BA%EF%BC%88+%EF%BC%89J%2C%E6%8B%89%E5%8A%9B%E5%81%9A%E5%8A%9F%E7%9A%84%E5%8A%9F%E7%8E%87%E4%B8%BA%EF%BC%88+%EF%BC%89W%2C%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%BA%EF%BC%88+%EF%BC%89)
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