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anonymous
 4 years ago
Find the volume of the solid generated by revolving the described region about the given axis:
The region bounded above by the line y=4 , below by the curve y=x^2 , rotated along the following lines: y=4
anonymous
 4 years ago
Find the volume of the solid generated by revolving the described region about the given axis: The region bounded above by the line y=4 , below by the curve y=x^2 , rotated along the following lines: y=4

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0GT as in Georgia Tech?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0\[\Pi \int\limits\limits\limits_{2}^{2}(x^24)^2 \]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0If you think about it for it a bit, its going to be the volume of the solid generated by revolving \[y = x ^{2}  4\] about the x  axis. The equation crosses the xaxis positive and negative 2, so those are your limits of integration. This is a disk, which has circular partitions. If we add up the area of all the circular partitions, we can get the volume. \[A = \pi r ^{2}\] The integral of area is volume. Your radius is x^2  4. So now just do the integration. \[V = \pi \int\limits_{2}^{2} (x ^{2}  4)^{2} dx\]

TuringTest
 4 years ago
Best ResponseYou've already chosen the best response.0nash and rogue are right just to clean this up a little we can note that the integrand is even, so\[\pi\int_{2}^{2}(x^24)^2dx=2\pi\int_{0}^{2}(x^48x^2+16)dx\]which is a very straightforward integration.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Thank you guys, my final answer was 512/15pi, which was right!

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0So what about with rotation y=8, what would the limits be?

TuringTest
 4 years ago
Best ResponseYou've already chosen the best response.0same area bounded by y=x^2 and y=4 about y=8 ?

TuringTest
 4 years ago
Best ResponseYou've already chosen the best response.0...or is it now the area bounded between y=x^2 and y=8 about y=8 ?
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