一块长2m,宽20cm,厚10cm,质量88kg的预制件,如图所示.(g取10N/kg)求:1.预制件对地面的压强2.建筑工人在1min里,把预制件搬到3m高,至少要做多少功?功率多大?3.如果工人在地面用滑轮组(如图)把
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![一块长2m,宽20cm,厚10cm,质量88kg的预制件,如图所示.(g取10N/kg)求:1.预制件对地面的压强2.建筑工人在1min里,把预制件搬到3m高,至少要做多少功?功率多大?3.如果工人在地面用滑轮组(如图)把](/uploads/image/z/9894575-47-5.jpg?t=%E4%B8%80%E5%9D%97%E9%95%BF2m%2C%E5%AE%BD20cm%2C%E5%8E%9A10cm%2C%E8%B4%A8%E9%87%8F88kg%E7%9A%84%E9%A2%84%E5%88%B6%E4%BB%B6%2C%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA.%EF%BC%88g%E5%8F%9610N%2Fkg%EF%BC%89%E6%B1%82%EF%BC%9A1.%E9%A2%84%E5%88%B6%E4%BB%B6%E5%AF%B9%E5%9C%B0%E9%9D%A2%E7%9A%84%E5%8E%8B%E5%BC%BA2.%E5%BB%BA%E7%AD%91%E5%B7%A5%E4%BA%BA%E5%9C%A81min%E9%87%8C%2C%E6%8A%8A%E9%A2%84%E5%88%B6%E4%BB%B6%E6%90%AC%E5%88%B03m%E9%AB%98%2C%E8%87%B3%E5%B0%91%E8%A6%81%E5%81%9A%E5%A4%9A%E5%B0%91%E5%8A%9F%3F%E5%8A%9F%E7%8E%87%E5%A4%9A%E5%A4%A7%3F3.%E5%A6%82%E6%9E%9C%E5%B7%A5%E4%BA%BA%E5%9C%A8%E5%9C%B0%E9%9D%A2%E7%94%A8%E6%BB%91%E8%BD%AE%E7%BB%84%EF%BC%88%E5%A6%82%E5%9B%BE%EF%BC%89%E6%8A%8A)
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