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Math Help - [SOLVED] The Disk Method, Hwk

  1. #1
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    [SOLVED] The Disk Method, Hwk

    Consider the solid obtained by rotating the region bounded by the given curves about the y-axis.




    so i dont think this is the washer method

    y = (x/5)^2
    Last edited by XplicitZero; June 24th 2009 at 06:26 PM.
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  2. #2
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    Quote Originally Posted by XplicitZero View Post
    Consider the solid obtained by rotating the region bounded by the given curves about the y-axis.



    Okay, so i think this is the washer method( where the inside is empty)

    so its " Pi ( outer radius)^2 - Pi ( Inner radius)^2 "

    Can someone please explain to me how i can find both the radii

    disk method ...

    V = \pi \int_0^2 (5\sqrt{y})^2 \, dy<br />
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  3. #3
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    oh Okay Got it.

    ans is 50pi =] thank you skeeter
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