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//Example number 1.9, Page number 13
clc;clear;
close;
//Variable declaration
a=7.68*10**-29;
r0=2.5*10**-10; //radius(m)
//Calculation
b=a*(r0**8)/9;
y=((-2*a*r0**8)+(90*b))/r0**11;
E=y/r0/10**9; //young's modulus(GPa)
//Result
printf( "young''s modulus is %d GPa",E)
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