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clc;
warning("off");
printf("\n\n example6.9 - pg258");
// given
spg=0.84;
p=0.84*62.4; //[lbf/ft^3] - density
dP=80*144; //[lbf/ft^2] - pressure
dz=2000; //[ft] - length of pipe
gc=32.174; //[(lbm*ft)/(lbf*sec^2)] - gravitational conversion constant
dpbydz=-dP/dz;
do=2.067/12; //[ft]
U=2000*(1/24)*(1/3600)*(42)*(1/7.48)*(1/0.02330);
// using the formula f=((do/2)*(-dp/dz)*gc)/(p*(U)^2)
f=((do/2)*(-dpbydz)*gc)/(p*(U)^2)
disp(f,"f=");
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