My name is Barry Allen,and I am the fastest manalive.
To the outside world, I'm an ordinary forensic scientist,
but secretly, with the help of my friends at S.T.A.R. Labs,
I fight crime and find other meta-humans like me.
I hunted down the man who killed my mother, but in doing so,
I opened up our world to new threats.
And I am the only one fast enough to stop them.

I am The Flash!
                        ----------<閃電俠>貝瑞·艾倫

今天艾倫要打擊罪犯，他利用了鐵線高速旋轉，產生高速氣流，成功打敗敵人。

回到實驗室時，他回想起今天的事情：鐵線高速旋轉時，好像就像一個以軸為y=0的一個物體，而鐵線就是一個函數圖形y=f(x)。

今天f(x)為多項式函數，鐵線端點在x=a和x=b上(a<b)，求旋轉後的體積
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示意圖(未依原比例、原精準度)