A lamina occupies the part of the disk [tex]x^2+y^2=<25[/tex] in the first quadrant and the density at each point is given by the function [tex] \ro (x,y)=3(x^2+y^2)[/tex](adsbygoogle = window.adsbygoogle || []).push({});

i am to find the mass, so this is what i did:

[tex]\int _0 ^{ \frac{\pi}{ 2}} \int _0 ^{5}(3 r) r dr d \theta[/tex]

i evauated this and got pi/2 15^3... but this is wrong, not sure why

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# Homework Help: Multi-d calc

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