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+//Example 7_6
+clc;clear;
+// Given values
+// Properties
+//For air at atmospheric pressure and at T = 25°C
+T=25;//degree celsius
+rho_p=1.184;//kg/m^3
+mu_p=1.849*10^-5;//kg/m.s
+V_p=50;//Speed in mi/h
+//Similarly,at T=5°C
+T=5;//degree celsius
+rho_m=1.269;//kg/m^3
+mu_m=1.754*10^-5;// kg/m.s
+V_m=221;//mi/h
+// (L_p/L_m)=5 The ratio of Lp to Lm is known because the prototype is five times larger than the scale model
+F_dm=21.2;//The average drag force on the model in lbf 
+
+// Calculation
+F_dp=F_dm*(rho_p/rho_m)*(V_p/V_m)^2*(5)^2;
+printf("The aerodynamic drag force on the prototype=%0.1f lbf",F_dp);