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Use spherical cord to compute area of a disk

  1. Apr 17, 2013 #1
    1. The problem statement, all variables and given/known data

    Use spherical cords to compute area of a disk, that's center at x,y=0, and z=4, having a radius of 3

    2. Relevant equations

    I set up a triple ∫∫∫ (r^2* sin(theta)), running from phi =0 to 2pi,
    theta=0 to arcsin(3/5), r=5sin(theta) to 5.


    3. The attempt at a solution
    It doesn't give me a current answer. What's wrong

    Am I even on the right track?
     
  2. jcsd
  3. Apr 17, 2013 #2

    Mark44

    Staff: Mentor

    This is way off. To compute area you need only a single integral or at most a double integral.

    Also, you have omitted the differentials on your integral.
     
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