工人如图13所示的定滑轮把一个重物为500牛的箱子匀速提升到4米高度,工人所用的拉力应为多少牛?为了顺利把箱子拉上去,工人的体重至少应为多少牛?绳子自由端移动的距离为多少米?(要具
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![工人如图13所示的定滑轮把一个重物为500牛的箱子匀速提升到4米高度,工人所用的拉力应为多少牛?为了顺利把箱子拉上去,工人的体重至少应为多少牛?绳子自由端移动的距离为多少米?(要具](/uploads/image/z/14444824-40-4.jpg?t=%E5%B7%A5%E4%BA%BA%E5%A6%82%E5%9B%BE13%E6%89%80%E7%A4%BA%E7%9A%84%E5%AE%9A%E6%BB%91%E8%BD%AE%E6%8A%8A%E4%B8%80%E4%B8%AA%E9%87%8D%E7%89%A9%E4%B8%BA500%E7%89%9B%E7%9A%84%E7%AE%B1%E5%AD%90%E5%8C%80%E9%80%9F%E6%8F%90%E5%8D%87%E5%88%B04%E7%B1%B3%E9%AB%98%E5%BA%A6%2C%E5%B7%A5%E4%BA%BA%E6%89%80%E7%94%A8%E7%9A%84%E6%8B%89%E5%8A%9B%E5%BA%94%E4%B8%BA%E5%A4%9A%E5%B0%91%E7%89%9B%3F%E4%B8%BA%E4%BA%86%E9%A1%BA%E5%88%A9%E6%8A%8A%E7%AE%B1%E5%AD%90%E6%8B%89%E4%B8%8A%E5%8E%BB%2C%E5%B7%A5%E4%BA%BA%E7%9A%84%E4%BD%93%E9%87%8D%E8%87%B3%E5%B0%91%E5%BA%94%E4%B8%BA%E5%A4%9A%E5%B0%91%E7%89%9B%3F%E7%BB%B3%E5%AD%90%E8%87%AA%E7%94%B1%E7%AB%AF%E7%A7%BB%E5%8A%A8%E7%9A%84%E8%B7%9D%E7%A6%BB%E4%B8%BA%E5%A4%9A%E5%B0%91%E7%B1%B3%3F%EF%BC%88%E8%A6%81%E5%85%B7)
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