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diff --git a/1571/CH9/EX9.3/Chapter9_Example3.sce b/1571/CH9/EX9.3/Chapter9_Example3.sce
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+clc
+clear
+
+//INPUT
+t1=90;//temperature of the oxygen boils in K
+t2=20;//temperature of the liquid hydrogen in K
+t3=300;//temperature of the sink in K
+
+//CALCULATIONS
+n=(t1-t2)/t1;//efficiency of the engine
+t4=t3/(1-n);//temperature of the source in K
+
+//OUTPUT
+mprintf('the efficiency of the engine is %3.2f \n the temperature of the source is %3.2f K',n,t4)