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Homework Help: Volume by shells

  1. Jan 28, 2013 #1
    1. The problem statement, all variables and given/known data
    I have to sketch a vertical or horizontal strip and state an expression for the volume of the shell formed by its rotation. Do not solve

    y=x^2+1 x=0
    y=1 x=1

    around y=-1
    2. Relevant equations

    3. The attempt at a solution
    I'm really lost because I don't know how to get started. I think dy works but I cant get it right. Any help will be great thanks.
  2. jcsd
  3. Jan 28, 2013 #2


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    Science Advisor
    Homework Helper
    Gold Member

    Have you figured out the shape in the plane? As a volume of revolution?
    Pls post what you have for the integral so that we can see where you are stuck.
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