1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Double integral volume problem

  1. Nov 18, 2014 #1
    1. The problem statement, all variables and given/known data
    find the volume of the solid below the plane z = 4x and above the circle x^2 + y^2 = 16 in the xy plane

    2. Relevant equations

    3. The attempt at a solution
    This totally confused me. I didn't think the plane z = 4x sat above the xy plane. If that is true then there would be no solid between the two graphs. I ended up putting zero for the answer. was I right or wrong
  2. jcsd
  3. Nov 18, 2014 #2


    Staff: Mentor

    Part of the z = 4x plane lies above the xy plane. Did you draw a sketch of the plane and the circle?
  4. Nov 19, 2014 #3


    User Avatar
    Homework Helper

    $$\iint_R z \space dA = \iiint_V \space dV$$

    $$\iiint_V \space dV = \iint_R \int_0^z \space dzdA$$


    Polar co-ordinates.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted