i just copy pasted the actual problem from wamap.. and about the formula, I'm not sure either since i found it from google...
anyhow, how do you get the parametric equation? is that something to remember?
thanks
1. Problem:
A fluid has density 1000 km/m3 and flows with velocity V =<x,y,z>, where x, y, and z are measured in meters, and the components of V are measured in meters per second. Find the rate of flow outward through the part of the paraboloid z = 64 - x^2 - y^2 that lies above the xy plane...