Asked by Anon.

Find the mass and center of mass of the lamina that occupies the region D and has the given density function ρ.
D is the triangular region with vertices (0, 0), (2, 1), (0, 3); ρ(x, y) = 5(x + y)

m=?
(x,y)=?

Answers

Answered by Steve
Consider the area as a bunch of tiny rectangles, each of width dx and height dy. Each rectangle's mass is its area times its density. o, adding them all up, using vertical strips so we don't have to split the boundary:

m = ∫<sub>R</sub> ρ dy dx
= ∫[0,3]∫[x/2, 3-x] 5(x+y) dy dx
= 5∫[0,3] xy + y^2/2 [x/2, 3-x]
= 5∫[0,3] (x(3-x)+(3-x)^2)-(x*x/2 + x^2/8) dx
= 5∫[0,3] 9-3x-5x^2/8 dx
= 5(9x - 3x^2/2 - 5x^3/24) [0,3]
= 135/8
Answered by Anon
Its wrong.
Answered by Steve
Hmmm. I have to run, but maybe you can figure it out by the time I get back.
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