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+///Chapter 9 Law Of Thermodynamics
+//Example 9.5 Page No:168
+/// Find Change in interval energy
+///Input data
+clc;
+clear;
+W=-2000;      //Work input of panddle wheel in KJ
+Q1=-6000;     //Heat transferred to the surrounding from tank
+
+//Calculation
+deltaU=Q1-W;   //Change in interval energy
+
+///Output
+printf('change in interval energy drop= %f  KJ \n',deltaU);