initial commit / add all books

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diff --git a/797/CH11/EX11.2s/11_02_solution.sce b/797/CH11/EX11.2s/11_02_solution.sce
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+//Solution 11-2
+WD=get_absolute_file_path('11_02_solution.sce');
+datafile=WD+filesep()+'11_02_example.sci';
+clc;
+exec(datafile)
+//unit conversions
+L = L * 10**3; //from [km] to [m]
+V = V * 1000/3600; //from [km/h] to [m/s]
+HV = HV * 1000; //from [kJ/kg] to [J/kg]
+eta = eta / 100; //from [%] to fraction
+A = W * H; //frontal area of car [m^2]
+F_D = C_D * A * rho_air * V**2 / 2; //drag force
+W_drag = F_D * L; //work done to overcome drag
+E_in = W_drag / eta; //required energy to do work
+amt_fuel = (E_in / HV) / rho; //amount of fuel that supplied E_in energy
+cost = amt_fuel * price; //cost of fuel per year in $
+A_new = W * H_new; //new frontal area of car
+red_ratio = (A - A_new) / A; //as % reduction directly proportional to A
+fuel_saved = red_ratio * amt_fuel; //amount of fuel saved
+cost_saved = red_ratio * cost; //amount of money saved
+printf("By reducing height from %1.2f m to %1.2f m\n", H, H_new);
+printf("\t The amount of fuel saved is %1.f L/year\n", fuel_saved);
+printf("\t The amount of money saved is $%1.f/year\n", cost_saved);
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