initial commit / add all books

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diff --git a/797/CH3/EX3.13.s/3_13_solution.sce b/797/CH3/EX3.13.s/3_13_solution.sce
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+//Solution 3-13
+WD=get_absolute_file_path('3_13_solution.sce');
+datafile=WD+filesep()+'3_13_example.sci';
+clc;
+exec(datafile)
+H = H / 100; //converting height from [cm] to [m]
+R = D / 2 / 100; //radius of cylinder [m]
+h_0 = h_0 / 100;
+omega = sqrt(4 * g * (H - h_0) / R**2); //from equation for the free surface of liquid
+ndot = omega / (2 * %pi) * 60; //rotational speed [rpm]
+printf("Rotational speed of the container must be restricted to %1.2f rpm to avoid any spill of liquid as a result of centrifugal effect", ndot);
+z_0 = h_0 - omega^2 * R^2 / (4 * g); //height of liquid at the center [m]
+printf("\nHeight of liquid at the center is %1.2f m>0 hence our assumption is valid", z_0);