initial commit / add all books

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+clc;

+//Example 15.2

+//page no 169

+printf(" Example 15.2 page no 169\n\n");

+//nitrogen gas is flowing in a duct,neglect compressibility effects

+T=293//temperature,k

+R=8314.4//gas constant

+k=1.4//for nitrogen

+M=28//molecular weight of nitrogen

+c=sqrt(k*R*T/M)//speed of sound in nitrogen 

+printf("\n speed of sound on nitrogen c=%f m/s",c);

+v=82//flow velocity 

+M_a=v/c//mach no.

+printf("\n mach no. M_a=%f ",M_a);