1.如图9-3.4所示,物重100N,当它受到水平面运动时受到的摩擦力为45N,用滑轮组使物体沿水平面以0.2m/s的速度匀速运动20s.忽略绳重、滑轮重及摩擦力,则水平拉力F的大小为_____N,拉力F做的功为_____J
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![1.如图9-3.4所示,物重100N,当它受到水平面运动时受到的摩擦力为45N,用滑轮组使物体沿水平面以0.2m/s的速度匀速运动20s.忽略绳重、滑轮重及摩擦力,则水平拉力F的大小为_____N,拉力F做的功为_____J](/uploads/image/z/3825661-13-1.jpg?t=1.%E5%A6%82%E5%9B%BE9-3.4%E6%89%80%E7%A4%BA%2C%E7%89%A9%E9%87%8D100N%2C%E5%BD%93%E5%AE%83%E5%8F%97%E5%88%B0%E6%B0%B4%E5%B9%B3%E9%9D%A2%E8%BF%90%E5%8A%A8%E6%97%B6%E5%8F%97%E5%88%B0%E7%9A%84%E6%91%A9%E6%93%A6%E5%8A%9B%E4%B8%BA45N%2C%E7%94%A8%E6%BB%91%E8%BD%AE%E7%BB%84%E4%BD%BF%E7%89%A9%E4%BD%93%E6%B2%BF%E6%B0%B4%E5%B9%B3%E9%9D%A2%E4%BB%A50.2m%2Fs%E7%9A%84%E9%80%9F%E5%BA%A6%E5%8C%80%E9%80%9F%E8%BF%90%E5%8A%A820s.%E5%BF%BD%E7%95%A5%E7%BB%B3%E9%87%8D%E3%80%81%E6%BB%91%E8%BD%AE%E9%87%8D%E5%8F%8A%E6%91%A9%E6%93%A6%E5%8A%9B%2C%E5%88%99%E6%B0%B4%E5%B9%B3%E6%8B%89%E5%8A%9BF%E7%9A%84%E5%A4%A7%E5%B0%8F%E4%B8%BA_____N%2C%E6%8B%89%E5%8A%9BF%E5%81%9A%E7%9A%84%E5%8A%9F%E4%B8%BA_____J)
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