Results 1 to 2 of 2

Math Help - Volume Problem

  1. #1
    Junior Member
    Joined
    Sep 2008
    Posts
    31

    Volume Problem

    The solid lies between planes perpendicular to the y-axis at y=0 and y=2. The cross sections perpendicular to the y-axis are circular disks with diameters running from the y-axis to the parabola x = \sqrt{5}*y^2

    So I honestly do not have a single clue as to what to do. My teacher decided to briefly skim this section. Help please?

    Edit: Nevermind, I think I got it. I let the area = pi(r^2) and r = rt (5)/2 * y^2
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Member
    Joined
    Apr 2009
    Posts
    108
    It actually goes like this

    since its getting rotated around the y axis- u need to find x^2

    from the equation x= root5 y^2
    we get x^2 = 5y^4

    now just preform this following integral 5pi S from2 to 0 (y^4)

    and the when you evaulte the integral u should get the answer.,
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. How to set this volume problem?
    Posted in the Calculus Forum
    Replies: 2
    Last Post: April 6th 2009, 04:56 PM
  2. Replies: 2
    Last Post: January 10th 2009, 05:49 AM
  3. problem regarding volume
    Posted in the Math Topics Forum
    Replies: 2
    Last Post: November 4th 2008, 07:07 PM
  4. Another Volume Problem
    Posted in the Calculus Forum
    Replies: 4
    Last Post: October 4th 2008, 02:53 PM
  5. volume problem
    Posted in the Calculus Forum
    Replies: 2
    Last Post: December 9th 2007, 03:43 PM

Search Tags


/mathhelpforum @mathhelpforum