Results 1 to 1 of 1

Math Help - Really simple question on Surface Intergrals Plz help

  1. #1
    Newbie
    Joined
    Mar 2010
    Posts
    1

    Really simple question on Surface Intergrals Plz help

    Hey everyone,

    Sorry i dont know how to add math equations.

    For those who dont want to read the whole thing. I just cant figure out what sqrt(1-x^2)*sqrt(x^2-3) is. You can read further if you want full description of the problem.

    I am new as you can tell. Anyway my problem. SO i was told to calculate the surface integral of x^2*z above the xy plane between y=0 and y=2 and the cylinder x^2+z^2=1.

    So first i converted to: z = sqrt(1-x^2) we need not look at negative because it is only above xy plane.

    To do surface integrals you use DBL INTEGRAL over R of f(x,y,z)*Sqrt(dz/dx+z/dy+1)
    So dz/dx=-2x/(1-x^2)^(-1/2) dy/dx=0

    so im left with dbl integral over R x^2)*(sqrt(1-x^2))*Sqrt(x^2-3)dA

    ANd i am confused simply over how to multiply those 2 radicals. I want to pull my brain out.
    Last edited by mr fantastic; March 28th 2010 at 07:15 PM. Reason: Edited post title
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Calculus 3: Surface Area and Triple Intergrals
    Posted in the Calculus Forum
    Replies: 4
    Last Post: December 12th 2011, 07:02 PM
  2. [SOLVED] Vector calculus: simple surface integral problem
    Posted in the Calculus Forum
    Replies: 2
    Last Post: May 25th 2011, 02:05 AM
  3. [SOLVED] Simple Stokes' Theorem/surface integral problem
    Posted in the Calculus Forum
    Replies: 1
    Last Post: January 20th 2011, 09:06 PM
  4. Easy Question - Simple Interest, Simple Discount
    Posted in the Business Math Forum
    Replies: 0
    Last Post: September 21st 2010, 09:22 PM
  5. Replies: 4
    Last Post: May 4th 2010, 10:08 AM

Search Tags


/mathhelpforum @mathhelpforum