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+//scilab 5.4.1
+clear;
+clc;
+printf("\t\t\tProblem Number 4.2\n\n\n");
+// Chapter 4 : The Second Law Of Thermodynamics
+// Problem 4.2  (page no. 149) 
+// Solution
+
+//given data
+Qin=100; //heat added to the cycle 
+
+printf("In problem 4.1,\n")
+//given data
+t1=1000;  //(unit:fahrenheit) //Source temperature
+t2=80;   //(unit:fahrenheit)  //Sink temperature
+//solution
+//converting temperatures to absolute temperatures;
+T1=t1+460; //Source temperature //Unit:R
+T2=t2+460;  //Sink temperature //Unit:R
+printf("Solution for (a)\n");
+printf("Efficiency of the engine is %f percentage\n\n",((T1-T2)/T1)*100);
+
+printf("Now in problem 4.2,\n")
+W=0.63*Qin; //W=W/J; //Efficiency in problem 4.1 
+W=Qin*(W/Qin); //amount of work
+Qr=Qin-W; //Qin-Qr=W/J  //Qr=heat rejected by the cycle
+printf("The heat removed from the reservoir %f units",Qr);