initial commit / add all books

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diff --git a/3131/CH6/EX6.18/6_18.sce b/3131/CH6/EX6.18/6_18.sce
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+clear all; clc;
+disp("Ex 6_18")
+disp("Free body diagram is shown in figure 6-31b")
+//Calculations
+//Applying summation of forces along Y axis and equating them to zero
+//We get three equations and we solve for each component
+//Solving by matrix method to obtain solution
+A=[3,0,0;-2,1,0;-2,-1,1]
+B=[600;0;0]
+C=inv(A)
+D=C*B 
+P=D(1)
+T=D(2)
+R=D(3)
+
+//Result
+printf('\n The values are \n')
+printf('\n P=%0.0f N\n T=%0.0f N\n R=%0.0f N',P,T,R)