一个工人用滑轮组将重800N的货物在20s内匀速提高了2m,人对绳子的拉力是250N,在拉力的作用下绳子端移动了8m,求:(1)拉力的功率是多少 (2)滑轮组的机械效率是多少?你们两个专家的回答都
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![一个工人用滑轮组将重800N的货物在20s内匀速提高了2m,人对绳子的拉力是250N,在拉力的作用下绳子端移动了8m,求:(1)拉力的功率是多少 (2)滑轮组的机械效率是多少?你们两个专家的回答都](/uploads/image/z/5031968-32-8.jpg?t=%E4%B8%80%E4%B8%AA%E5%B7%A5%E4%BA%BA%E7%94%A8%E6%BB%91%E8%BD%AE%E7%BB%84%E5%B0%86%E9%87%8D800N%E7%9A%84%E8%B4%A7%E7%89%A9%E5%9C%A820s%E5%86%85%E5%8C%80%E9%80%9F%E6%8F%90%E9%AB%98%E4%BA%862m%2C%E4%BA%BA%E5%AF%B9%E7%BB%B3%E5%AD%90%E7%9A%84%E6%8B%89%E5%8A%9B%E6%98%AF250N%2C%E5%9C%A8%E6%8B%89%E5%8A%9B%E7%9A%84%E4%BD%9C%E7%94%A8%E4%B8%8B%E7%BB%B3%E5%AD%90%E7%AB%AF%E7%A7%BB%E5%8A%A8%E4%BA%868m%2C%E6%B1%82%EF%BC%9A%EF%BC%881%EF%BC%89%E6%8B%89%E5%8A%9B%E7%9A%84%E5%8A%9F%E7%8E%87%E6%98%AF%E5%A4%9A%E5%B0%91+%EF%BC%882%EF%BC%89%E6%BB%91%E8%BD%AE%E7%BB%84%E7%9A%84%E6%9C%BA%E6%A2%B0%E6%95%88%E7%8E%87%E6%98%AF%E5%A4%9A%E5%B0%91%3F%E4%BD%A0%E4%BB%AC%E4%B8%A4%E4%B8%AA%E4%B8%93%E5%AE%B6%E7%9A%84%E5%9B%9E%E7%AD%94%E9%83%BD)
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