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8) A sheet occupies the disk part x^2+y^2≤16 in C1, its density is ρ(x,y)=xy^2 a) Find...

8) A sheet occupies the disk part x^2+y^2≤16 in C1, its density is ρ(x,y)=xy^2
a) Find the centroid of the sheet
b) Find the center of mass of the sheet
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