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Math Help - Question about Washer's Method

  1. #1
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    Question about Washer's Method

    When it says to rotate about the y-axis, does this mean to solve the integral by dx?

    And when it says rotate about the x-axis, does this mean to solve the integral by dy?

    Thanks.
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  2. #2
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    Quote Originally Posted by elpermic View Post
    When it says to rotate about the y-axis, does this mean to solve the integral by dx?

    And when it says rotate about the x-axis, does this mean to solve the integral by dy?

    Thanks.


    other way around
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  3. #3
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    This also applies with problems such as rotate around the line x=1 and y=1 right?
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  4. #4
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    Quote Originally Posted by elpermic View Post
    This also applies with problems such as rotate around the line x=1 and y=1 right?


    yes
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  5. #5
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    Quote Originally Posted by elpermic View Post
    This also applies with problems such as rotate around the line x=1 and y=1 right?


    also keep in mind if you are using the cylindrical sheels method you are drawing the line parallel to the axis of rotatio so in this case and this case only is what you said first correct



    everything else is the opposite, including all washer problems
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