//Mach number at entry:
M1=0.52;
//Temperature at entry(in F):
T1=40;
//Pressure at entry(in psia):
p1=60;
//Area at entry(in ft^2):
A1=0.013;
//Back pressure(in psia):
pb=30;
//Gas Consant(in ft-lbf/lbm-R)
R=53.3;
//Value of k:
k=1.4;