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+//example 10
+// cooling of hot fluid in tank
+clear
+clc
+disp('suppose that there is no change in kinetic and potential energy ')
+u1=800 //initial internal energy in 800kJ
+win=100 //work done by paddle on system in kJ
+qout=500 //loss of energy from fluid
+disp('applying first law of thermodynamics ')
+u2=u1-qout+win //final internal energy in kJ
+printf("\n Hence,final internal energy of the fluid is = %.1f kJ. \n",u2);
+\ No newline at end of file