Please help with these Calc 3 questions ASAP?!! Within 2 hours and 10 minutes!!?

Posted on 2017-10-11 18:34:00 in Math by RONAL

A) Electric charge is distributed over the disk x^2 + y^2<_1 so that the charge density at (x,y) is standard deviation(x,y) = (x^2+y^2)^1/2 (measured in coulombs per square meter). Find the total charge on the disk. 

B) Find the mass and center of mass of the lamina that occupies the region D and has the given density function p. 

D is bounded by y=x^2 and y=x+2; p(x,y) = kx 

D = {(x,y) | 0<_ x <_ a, 0 <_ y <_ b}; p(x,y)= 1 + x^2 + y^2

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