initial commit / add all books

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diff --git a/1151/CH2/EX2.11/example11.sce b/1151/CH2/EX2.11/example11.sce
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+printf("the second order control system has  transfer function Q(s)/T(s)=1/(J*s^2+f*s+k)");

+printf("given T(s)= 10/s");

+printf("Q(s)=1/(s*(J*s^2+f*s+k)");

+printf("characterstic equation of the given system is J*s^2+f*s+k =0");

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

+k=10/0.5; 

+d1=log(0.06);

+d=sqrt(d1^2/(d1^2+%pi^2));

+w=%pi/sqrt(1-d^2);

+j=k/w^2;

+f=2*d*w*j;

+disp(d,"damping ratio=");

+disp(w,"undamped natural frequency(in rad/sec)=");

+disp(k,"value of K=");

+disp(j,"value of J=");

+disp(f,"value of f=");

+