- #1

- 131

- 2

## Homework Statement

## Homework Equations

m = ∫∫

_{s}ρ(x,y,z)dS

## The Attempt at a Solution

I used polar coordinates for this (is that necessary here)? I found z

_{x}and z

_{y}, took the cross product of those, and found it to be √(2). So dS = √2 dA.

√2 ∫

_{0}

^{2pi}∫

_{2}

^{5}r

^{2}drdθ = 78pi√2