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+// Example 7_3
+clc;funcprot(0);
+// Given data
+L=100;// The length of the ship in m
+A=3*10^3;// Surface area in m^2
+rho=1.03*10^3;// The density of sea water in kg/m^3
+V=8;// Speed in m/s
+epsilon=1*10^-4;// The surface roughness in m
+nu=1*10^-6;// The kinematic viscosity in m^2/s
+
+// Calculation
+Re_L=(V*L)/nu;// The length Reynolds number Re_L
+// If the ship surface were smooth,
+C_D_fp=0.455/(log10(Re_L))^2.58;// The drag coefficient
+// For a rough surface,
+C_D_fp=0.30/(log10(14.7*(L/epsilon))^2.5);// The drag coefficient for a rough surface
+D=((1/2)*rho*V^2)*A*C_D_fp;// The ship's frictional drag force in N
+P=D*V;// The power in MW
+printf("\nThe ships frictional drag force,D=%1.4e N \nThe power required to overcome drag force,DV=%1.3f MW",D,P/10^6);