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+clc;
+clear all;
+disp("temperature and time")
+R=40/2000;//m
+ti=20;// degree C
+tau=4*60;//s
+ta=100;// degree C
+k=10;// W/m.C
+rho=1200;// kg/m^3
+c=2000;// J/kg.C
+h=100;//W/m^2.C
+Lc=R/3;// for sphere
+Bi=h*Lc/k
+
+t=ta+(ti-ta)*exp(-h*3*tau/(R*rho*c))
+disp("degree C")
+ti=5;// degree C
+X=(t-ta)/(ti-ta);
+Y=-h*3/(R*rho*c)
+tau=(log (X))/Y;// sec
+disp("min",tau/60,"time taken tau =")