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+clear all;
+clc;
+
+// A Textbook on HEAT TRANSFER by S P SUKHATME
+// Chapter 2
+// Heat Conduction in Solids
+
+// Example 2.9
+// Page 51
+printf("Example 2.9, Page 51 \n\n")
+
+k = 330;             //thermal conductivity in W/m K
+a = 95*10^(-6);      //thermal expansion coefficient
+R = 0.01;            //radius in meters
+To = 77;            //temperature in kelvins
+Tf = 273+50;        //temperature in kelvins
+theta1 = To - Tf;
+T = 273+10;         //temperature in kelvins
+theta = T - Tf;
+h = 20;             //heat transfer coefficient in W/m^2 K
+printf("\n Theta1 = %d K",theta1);
+printf("\n Theta = %d K ",theta);
+printf("\n v/A = %.3f m",R/2);
+printf("\n k/a = %.4f*10^(6) J/m^3 K",(k/a)*10^(-6));
+
+time = (k/a)*(R/2)/h*log(theta1/theta);
+
+printf("\n Time taken by the rod to heat up = %.1f secs",time); 
+Bi = h*R/k;
+printf("\n Biot number Bi = %.2f*10^(-4) ",Bi*10^4);
+printf("\n Since Biot number is much less than 0.1,therefore assumption  that internal temperature gradients are negligible is a good one");
+
+
+
+
+
+
+