So as stated above I need to find the centre of mass of a annular hemisphere. the outer radius is $R$ and the inner radius is $a$. In a pкevious part to the question I found the volume of the annular hemisphere to be $R\pi(R^2-a^2)$.
Find the height of the centre of mass of an annular hemisphere
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calculus
integration
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0just looked at the link, yea that's what the question's talking about. – 2012-10-31