Chapter 6.10, Problem 8P

Evaluate each of the integrals in Problems 3 to 8 as either a volume integral or a surface integral, whichever is easier.

${\displaystyle \iiint \nabla }\cdot Vd\tau$ over the volume $x^2+y^2\le 4,0\le z\le 5,V=(\sqrt{x^2+y^2})(\text{ ix }+jy)$.