initial commit / add all books

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diff --git a/1309/CH4/EX4.10/Result4_10.pdf b/1309/CH4/EX4.10/Result4_10.pdf
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diff --git a/1309/CH4/EX4.10/ch4_10.sce b/1309/CH4/EX4.10/ch4_10.sce
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+clc;
+clear;
+printf("\t\t\tChapter4_example10\n\n\n");
+// determination of time required to cool to a certain temperature
+rou=7.817*62.4;
+c=.110;
+k=8.32;
+alpha=0.417e-4;
+dx=1/12;
+// taking Fo=1
+Fo=1;
+dt=Fo*dx^2/alpha;
+printf("\nThe time increments is %.1f s",dt);
+// We have to draw the Saul'ev plot to determine the number of time intervals
+n=8; //Enter the number of time intervals from Saulev plot
+time=n*dt;
+printf("\nThe required time is %.2f hr",time/3600);