//Area of 1 (in ft^2):
A1=0.2;
//Area of 2 (in ft^2):
A2=0.5;
//Area of 3 (in ft^2):
A3=0.4;
//Area of 4 (in ft^2):
A4=0.4;
//Density of water (in slug/ft^3):
d=1.94;
//Mass flow rate out of section 3(in slug/sec):
m3=3.88;
//Volme flow rate in section 4 (in ft^3/sec):
Q4=1;
//Velocity at 1(in ft/sec):
V1=10;