initial commit / add all books

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diff --git a/1151/CH2/EX2.5/example5.sce b/1151/CH2/EX2.5/example5.sce
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+printf("closed loop transfer function =G/(s^2+3*s+G)");

+printf("characterstic equation of the given system is s^2+3*s+G=0");

+printf("compare it with the standard second order characterstic equation s^2+2*d*w*s+w^2=0");

+d=0.6;//assume

+G=(1.5/d)^2;

+G'=2*G;

+w=sqrt(G');

+d'=1.5/w;

+w'=w*sqrt(1-d'^2);

+t=2*%pi/w';

+disp(G,"the minimum value of G for the step response of the system that it will exhibit an overshoot is");

+disp(t,"if G is twice the minimum value then time period T(in sec)= ")