a tank is formed by revolving the curve y=x^2 ; 0<=x<=4 ; around y-axis
if filled with water with weight 10000 N/m^3
find work needed to empty the tank by pumping it to the top ?
the problem is that i dont have the height to set the integral
is it right if i use the radius as 4?
this way ill get V=PI r^2 dy
integral limits ==??
any help or hints pls