initial commit / add all books

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diff --git a/2921/CH10/EX10.2/Ex10_2.sce b/2921/CH10/EX10.2/Ex10_2.sce
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+clc;
+clear;
+mprintf('MACHINE DESIGN \n Timothy H. Wentzell, P.E. \n EXAMPLE-10.2 Page No.198\n');
+
+Pa=100;              //[lb/in^2] Air pressure
+Da=4;                //[in] Diameter
+Aa=%pi*Da^2/4;       //[in^2] Cross section area
+
+F1=Pa*Aa;            //[lb] 
+Do=1;                //[in] 
+Ao=%pi*Do^2/4;       //[in] 
+Po=F1/Ao;            //[lb/in^2]
+
+mprintf('\n The oil pressure is %f lb/in^2.',Po);
+
+D2o=3;               //[in]
+A2o=%pi*D2o^2/4;     //[in^2]
+F2=Po*A2o;
+
+mprintf('\n Force F on piston rod is %f lb.',F2);
+
+D=1;                 //[in]
+d=4;                 //[in] 
+A=%pi*D^2/4;         //[in^2]
+
+V=A*d;               //[in^3]
+
+mprintf('\n The volume in 1-inch cylinder for the 4-inch travel is %f in^3.',V);
+
+A3=%pi*3^2/4;        //[in^2]
+l3=V/A3;             //[in]
+
+mprintf('\n Travel for 3-inch cylinder is %f in.',l3);
+
+