7. Let f(p, 0, ) = p be the density function for the solid V where V = {0

7. Let f(p, 0, p be the density function for the solid V where V = {0 p 2, 7t/4 0 7t/2, 0 S (t) 7t/2} in the spherical coordinate . Draw V. Set up the integral and find its mass using the spherical coordinate.