A horizontal pipe contains water at a pressure of 120kPa flowing with a speed of 1.4m/s . The pipe narrows to one-half its original diameter.
a) what is the speed of the water?
b) what is the pressure of the water?
I tried using the continuity equation A1V1=A2V2,
then V2= (A1/A2)V1 and I know that A1= pi (d1/2)^2 but I can't figure out how to find the diameter and so that I can get the radius to solve the area.
Help please?