Water is flowing in the circular pipe of varying cross-sectional area and at all points the water fully fills the pipe. (i) At one place in the pipe the radius is around 0.250 m. Determine the magnitude of the water velocity at this point when the volume flow rate is 0.600 m^3/s ? (ii) At a second point in the pipe the water velocity consists of a magnitude of around 15.0 m/s. Determine the radius of the pipe at this point?