initial commit / add all books

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diff --git a/1397/CH2/EX2.7/2_7.sce b/1397/CH2/EX2.7/2_7.sce
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+//clc();

+clear;

+//To determine the fundamental frequency

+t=0.001;           //thickness of the crystal in metres

+rho=2650;          //density of quartz in kg/m^3

+Y=7.9*10^10;             //youngs modulus in N/m^2

+V=sqrt(Y/rho);

+printf("the fundamental frequency is %f m/s",V);

+//For fundamental mode of vibration, the thickness must be equal to lambda/2

+lambda=2*t;

+new=V/lambda;

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