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+clc();
+clear;
+// To estimate the time lag of temperature (sine) wave
+t = 24; // Time period of tempearture wave in hr
+k = 0.6; // Thermal conductivity of wall in Btu/hr-ft-degF
+Cp = 0.2; // Specific heat capacity of wall in Btu/lb-degF
+y = 110; // specific gravity in lb/ft^3
+x = 8/12; // Distance from surface in ft
+a = k/(y*Cp); // Thermal diffusivity in ft^2/hr
+n=1/t; // frequency in /hr
+delr = x/(2*sqrt(a*%pi*n); // Time lag in hr
+printf("Time lag of the temperature at a point 8 in from surface is %.1f hr", delr;