使用如图所示的重50N的动滑轮,将重力为450N的物体匀速提示3M(不计绳重和摩擦)则拉力F所做的功和动滑轮的机械效率分别是多少?写清楚 已知求解答,
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![使用如图所示的重50N的动滑轮,将重力为450N的物体匀速提示3M(不计绳重和摩擦)则拉力F所做的功和动滑轮的机械效率分别是多少?写清楚 已知求解答,](/uploads/image/z/914317-61-7.jpg?t=%E4%BD%BF%E7%94%A8%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E7%9A%84%E9%87%8D50N%E7%9A%84%E5%8A%A8%E6%BB%91%E8%BD%AE%2C%E5%B0%86%E9%87%8D%E5%8A%9B%E4%B8%BA450N%E7%9A%84%E7%89%A9%E4%BD%93%E5%8C%80%E9%80%9F%E6%8F%90%E7%A4%BA3M%EF%BC%88%E4%B8%8D%E8%AE%A1%E7%BB%B3%E9%87%8D%E5%92%8C%E6%91%A9%E6%93%A6%EF%BC%89%E5%88%99%E6%8B%89%E5%8A%9BF%E6%89%80%E5%81%9A%E7%9A%84%E5%8A%9F%E5%92%8C%E5%8A%A8%E6%BB%91%E8%BD%AE%E7%9A%84%E6%9C%BA%E6%A2%B0%E6%95%88%E7%8E%87%E5%88%86%E5%88%AB%E6%98%AF%E5%A4%9A%E5%B0%91%3F%E5%86%99%E6%B8%85%E6%A5%9A+%E5%B7%B2%E7%9F%A5%E6%B1%82%E8%A7%A3%E7%AD%94%2C)
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