如右图所示,物体重400N.在水平拉力F作用下以0.2米每秒的速度沿水平面匀速移动20S,物体与地面间的摩擦力�物重的0.3倍,滑轮组的机械效率为75%,则:1.拉力F为 J .2.20s内拉力F做功 J.3.20s内所做
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![如右图所示,物体重400N.在水平拉力F作用下以0.2米每秒的速度沿水平面匀速移动20S,物体与地面间的摩擦力�物重的0.3倍,滑轮组的机械效率为75%,则:1.拉力F为 J .2.20s内拉力F做功 J.3.20s内所做](/uploads/image/z/3559134-30-4.jpg?t=%E5%A6%82%E5%8F%B3%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E7%89%A9%E4%BD%93%E9%87%8D400N.%E5%9C%A8%E6%B0%B4%E5%B9%B3%E6%8B%89%E5%8A%9BF%E4%BD%9C%E7%94%A8%E4%B8%8B%E4%BB%A50.2%E7%B1%B3%E6%AF%8F%E7%A7%92%E7%9A%84%E9%80%9F%E5%BA%A6%E6%B2%BF%E6%B0%B4%E5%B9%B3%E9%9D%A2%E5%8C%80%E9%80%9F%E7%A7%BB%E5%8A%A820S%2C%E7%89%A9%E4%BD%93%E4%B8%8E%E5%9C%B0%E9%9D%A2%E9%97%B4%E7%9A%84%E6%91%A9%E6%93%A6%E5%8A%9B%EF%BF%BD%E7%89%A9%E9%87%8D%E7%9A%840.3%E5%80%8D%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%BA75%EF%BC%85%2C%E5%88%99%EF%BC%9A1.%E6%8B%89%E5%8A%9BF%E4%B8%BA+J+.2.20s%E5%86%85%E6%8B%89%E5%8A%9BF%E5%81%9A%E5%8A%9F+J.3.20s%E5%86%85%E6%89%80%E5%81%9A)
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