1. The problem statement, all variables and given/known data If liquid contained within a closed circular cylinder rotates about the axis of the cylinder, prove that the equation of continuity and boundary conditions are satisfied by V = (omega) x r, where 'omega' is the angular velocity of fluid supposed to be dependent on time only, and r is the position vector measured from a point on the axis of rotation. 2. Relevant equations V = 'omega' x r The continuity equation in the cylindrical co-ordinates is attached as a word document 3. The attempt at a solution I need a hint as to how to start the solution.