如图所示某人用500N的拉力,在本分钟内用滑轮将900N的重物匀速提高3m,如果不及所有摩擦,求:(1)人拉绳时做的有用功是多大?(2)此时滑轮组的机械效率是多大?(3)人拉绳子的功率是多大?
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![如图所示某人用500N的拉力,在本分钟内用滑轮将900N的重物匀速提高3m,如果不及所有摩擦,求:(1)人拉绳时做的有用功是多大?(2)此时滑轮组的机械效率是多大?(3)人拉绳子的功率是多大?](/uploads/image/z/3567538-10-8.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E6%9F%90%E4%BA%BA%E7%94%A8500N%E7%9A%84%E6%8B%89%E5%8A%9B%2C%E5%9C%A8%E6%9C%AC%E5%88%86%E9%92%9F%E5%86%85%E7%94%A8%E6%BB%91%E8%BD%AE%E5%B0%86900N%E7%9A%84%E9%87%8D%E7%89%A9%E5%8C%80%E9%80%9F%E6%8F%90%E9%AB%983m%2C%E5%A6%82%E6%9E%9C%E4%B8%8D%E5%8F%8A%E6%89%80%E6%9C%89%E6%91%A9%E6%93%A6%2C%E6%B1%82%EF%BC%9A%EF%BC%881%EF%BC%89%E4%BA%BA%E6%8B%89%E7%BB%B3%E6%97%B6%E5%81%9A%E7%9A%84%E6%9C%89%E7%94%A8%E5%8A%9F%E6%98%AF%E5%A4%9A%E5%A4%A7%3F%EF%BC%882%EF%BC%89%E6%AD%A4%E6%97%B6%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%A4%A7%3F%EF%BC%883%EF%BC%89%E4%BA%BA%E6%8B%89%E7%BB%B3%E5%AD%90%E7%9A%84%E5%8A%9F%E7%8E%87%E6%98%AF%E5%A4%9A%E5%A4%A7%3F)
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