一捆铜线,质量是89kg,铜线的横截面积是25mm2。不用尺量,也能知道

一捆铜线,质量是89kg,铜线的横截面积是25mm2。不用尺量,也能知道这捆铜线的长度。它有多长?已知铜的密度为8.9×

答案

 解:铜线的体积:

       3

铜线的横截面积   1

这捆铜线的长度:

                            2

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