发布时间:2025-01-21 06:37:46
定滑轮的动力臂和阻力臂都是滑轮的半径,其实质上是一个等臂杠杆.根据杠杆平衡条件:F 1 L 1 =F 2 L 2 可知由于L 1 =L 2 所以F 1 =F 2 使用定滑轮既不省力也不省距离,但可改变力的方向.动滑轮的动力臂是滑轮的直径,阻力臂是滑轮的半径,其实质上是一个省力杠杆.根据杠杆平衡条件:F 1 L 1 =F 2 L 2 可知由于L 1 =2L 2 所以F 1 =
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坐便器进水口是在左边还是右边里地高度是多少距离下水口中心的距离是多少
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