Consider the hemispherical volume V defined by:
x^2 + y^2 + z^2 =< a^2, z>=0, and denote its closed surface by S.
Define the vector field f=(-y, x, z^2)
a) Evaluate the net outward flux of f through S by direct integration.
{to parameterise the curved surface use spherical polar coordinates}
plz help me its due in a few hours