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+// Ex 48 Page 393
+
+clc;clear;close;
+// Given
+theta1=20;//degree C
+theta2=35;//degree C
+t1=0.5;//hour
+t2=1;//hour
+theta_m_dashBYthetam=80/100;//temperature rise
+
+//theta=theta_m*(1-e**(-t/alfa))
+//theta1/theta2=(1-%e**(-t1/alfa))/(1-%e**(-t2/alfa))
+ee1=theta2/theta1-1;//let ee1=exp(-1/2/alfa)
+theta_m=theta1/(1-ee1);//degree C
+theta_2=theta_m*(1-ee1**4);// degree C (after 2 hours)
+printf("temperature rise after 2 hours full load = %.f degree C",theta_2)
+alfa=-1/2/log(ee1);//hour
+alfa_dash=theta_m_dashBYthetam*alfa;//hour
+theta_m_dash=theta_m_dashBYthetam*theta_m
+theta_dash=theta_m_dash*(1-%e**(-t2/alfa))
+printf("\n temperature rise of cold water after 1 hour = %.f degree C",theta_dash)
+//ans of 2nd part is wrong in the book.