hi,

find the center of mass (or centroid) of a thin plate of constant density covering the given region.

(a) The region bounded by y = x^2 and y = 4.

I can't seem to get this question... I tried to find the moment about the y axis:

\int px(f1 - f2)dx

4,0\int x((x^2)-4)dx

and I got an answer of 32

then I did the M:

4,0\int ((x^2)-4)

and got an answer of 16/3

I have no idea where I'm going wrong :L can someone please help