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+//Finding time
+//Example 15.32(pg. 413)
+clc
+clear
+m1=120//mass of water to be heated in kg
+m2=20//mass of copper tank in kg
+S1=1//specific heat of water
+S2=0.095//specific heat of copper
+T1=10//temp in degreeC
+T2=60//temp in degreeC
+H=(m1*S1*(T2-T1))+(m2*S2*(T2-T1))//heat required to raise the temp of water  and tank in kcal
+H1=H*4200//heat required in Joules
+e=0.8//thermal efficiency
+E=H1/e//Energy input in joules
+E1=E/(1000*3600)//energy input in kWh
+r=3//rating of heater in kW
+t=E1/r//time taken in hours
+printf('Thus the time taken to raise the temp is %2.3f hours',t)