initial commit / add all books

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diff --git a/2921/CH2/EX2.3/Ex2_3.sce b/2921/CH2/EX2.3/Ex2_3.sce
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+clc;
+clear;
+mprintf('MACHINE DESIGN \n Timothy H. Wentzell, P.E. \n EXAMPLE-2.3   Page 29 ')    //Example 2.3
+
+T=300*12;               //[in*lb] Engine torque 
+d=8;                    //[in] Crankshaft effective diameter
+
+F=T/(d/2);              //[lb] Force exerted by piston
+
+A=%pi*(2^2)/4;          //[in^2] Area of cross section of piston
+P=F/A;                  //[lb/in^2] Pressure in cylinder
+
+mprintf('\n\n Pressure inside cylinder %f lb/in^2',P);