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Setting up triple integrals in different coordinates

  1. Nov 24, 2013 #1
    1. The problem statement, all variables and given/known data

    Assume that f(x,y,z) is a continuous function. Let U be the region inside the cone z=√x^2+y^2 for 2≤x≤7. Set up the intregal ∫f(x,y,z)dV over U using cartesian, spherical, and cylindrical coordinates.

    2. Relevant equations

    CYLINDRICAL COORDINATES
    • x=rcosθ
    • y=rsinθ
    • z=z

    SPHERICAL COORDINATES
    • ρ^2 =x^2 + y^2 + z^2
    • x = ρsin(phi)cos(θ)
    • y=ρsin(phi)sin(θ)
    • z=ρcos(phi)

    3. The attempt at a solution

    Do Ineed to have a function for the inner two integrals?

    For my limits on integration for Cartesian coordinates are
    z = x^2 + y^2 -4 and z = x^2 + y^2 -25
    I DON'T KNOW FOR X
    and y = 2 and y = 5

    For my limits on the spherical coordinates are
    θ=2π, θ=0; and ρ=2, ρ=5

    I DON'T KNOW IF WHAT I'M DOING IS RIGHT OR NOT. I'M LOST :(

    Please and thank you for your help!
     
  2. jcsd
  3. Nov 24, 2013 #2

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    Your function is just f, you can use it as f(r, θ, z) and similar for spherical coordinates, that is fine.
    Your task is to find the integral borders and to convert dV.

    That is given in the problem statement, and please don't write in caps.

    Your attempt at a solution uses equations different from the problem statement.
     
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