a solid body lies under the cylinder X^2+Y^2-1 within the sphere X^2+Y^2+Z^2=4 and above the xy-plane , if the denisty is proportional to the square of distance from the xy-plane find the mass of the body
Again, the key is to first draw a rough sketch of the surface in order to see what the inetrgal limits will be. I suggest you develop your understanding of the question you posted here: http://www.mathhelpforum.com/math-he...id-167232.html
before attempting further questions of this type.