initial commit / add all books

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diff --git a/3776/CH7/EX7.9/Ex7_9.sce b/3776/CH7/EX7.9/Ex7_9.sce
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+clear
+//Given
+dia = 15      //mm - The diameter of the rod
+h = 0.5       //mt - The freely falling height 
+A = 3.14*(dia**2)/4 //mm2 The area of the crossection
+E = 200             //Gpa -Youngs modulus
+L = 750             //mm - The total length of the rod
+G = 80              //gpa - Shear modulus 
+N = 10              //number of live coils
+d = 5               //mm the diameter of live coil 
+m = 3               // the mass of freely falling body
+H = 500             //mm -from mass to spring  
+F= m*9.81           //Kg the force due to that mass
+p = 3        //KN-m _ the load applied
+//e = e_rod + e_spr
+//e_rod
+e_rod = p*L*(10**-3)/(A*E)                  //mm The elongation due to freely falling body
+//e_spr
+e_spr = 64*F*(dia**3)*N*(10**-3)/(G*(d**4)) //mm The elongation due to spring
+e = e_rod + e_spr                           //mm The total elongation 
+p_dyn =F*(1+((1+(2*H/e))**0.5))
+Stress_max = p_dyn/A                        //MPa - The maximum stress in the system 
+printf("\n The maximum stress in the system  %0.2f MPa",Stress_max)