bigWeld6845 bigWeld6845
  • 11-02-2018
  • Mathematics
contestada

Let r be the regeion bounded by y=x^2, x=1, and y=0. find the volume of the solid generated when r is revolved around x=-2

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sqdancefan
sqdancefan sqdancefan
  • 11-02-2018
We presume the area being revolved around x=-2 is that shaded in the diagram below. Using the cylindrical shell method, the height of the shell is y, and the radius is 2+x. This makes our integral
.. [tex] V= \int\limits^1_0 {2\pi (x+2)x^{2}} \, dx = 2\pi (\frac{1}{4}1^{4}+ \frac{2}{3}1^{3})= \frac{11 \pi}{6}[/tex]
.. V ≈ 5.75959 . . . . cubic units
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