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+clc;
+disp("Example A.7")
+Q=700000/3600 // in m^3/s
+d=0.2 // diameter in m
+v=1.2e-5 // kinematic viscosity
+Re=4*Q/(%pi*d*v)
+ratio=0.0013
+f=0.3313/((log((ratio/3.7)+(5.74/(Re^0.9))))^2)
+disp(f,"Friction factor is ")