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Homework Help: Centroid of solid enclosed by surface z= y^2 , plane x=0 ,

  1. Oct 31, 2016 #1
    1. The problem statement, all variables and given/known data
    Find the centroid of solid enclosed by surface z= y^2 , plane x=0 , x = 1 and z =1 . The density is 1

    2. Relevant equations

    3. The attempt at a solution
    Here's my working .

    Centoird = mass of inertia / mass
    So , i find the mass first .

    It's clear that the circle is on zx plane ... I am not sure whether to use z= rcos theta or z = rsin theta . Can you help ?

    Attached Files:

  2. jcsd
  3. Oct 31, 2016 #2


    Staff: Mentor

    Almost everything you have here is wrong.
    • Your drawing is way off. Take more time and get a more careful drawing the represents the solid described in your problem statement.
    • "the circle is on zx plane" -- No, it's not a circle.
    • You are apparently trying to use polar coordinates -- why?
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