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I'm asked in an exercise to calculate the center of mass for $V=\{{(x,y,z)|x^2+y^2\leq 2x\sin(z), 0\leq z\leq \pi}\}$, but I'm having trouble doing this "the normal way" - the integral(s) I get seems unsolvable (I've tried calculating the integral in two orders: $dxdydz$ and $dydxdz$, both ended up in something unsolvable).

(The density of the body is the same for every point)

Help would be appreciated :)!

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    Yeah, that's me. I deleted my browser cookies so I guess it forgot who I was.2012-05-22

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I've managed to solve the question. The idea is to notice that for a set $z$, $x^2+y^2\leq 2xsin(z)$ is a circle, and thus we can use the equations for the area and center of mass of a circle to calculate the internal double integral. The final answer is: $(8/(3\pi), 0, \pi/2)$