initial commit / add all books

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diff --git a/1397/CH2/EX2.6/2_6.sce b/1397/CH2/EX2.6/2_6.sce
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+//clc();

+clear;

+//To determine the fundamental frequency

+l=3*10^(-3);           //vibrating length of piezo electric crystal in metres

+rho=3.5*10^3;          //density of piezo electric crystal in kg/m^3

+Y=8*10^10;             //youngs modulus in N/m^2

+new=((10^-3)*(sqrt(Y/rho))*10^(-3))/(2*l);

+printf("the fundamental frequency is %f Hz",new);