initial commit / add all books

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+//Ex9.3.5.1.;Calculate Energy generated

+R=12;//unit=m; R is the range

+r=3;//unit=m; the head below turbine stops operating

+time=(44700/2);

+A=30*10^6;

+g=9.80;

+p=1025;

+//The total theoretical work W=integrate('1','w',R,r);

+W=(g*p*A*((R^2)-(r^2)))/2;

+printf(" W=%f ",W);

+//The average power generated

+Pav=W/time;//unit=watts

+printf("\n The average power generated=%f watts",Pav);

+pav=(Pav/1000)*3600;//unit=kWh

+printf("\n The average power generated=%f kWh",pav)

+//the energy generated

+Energy_generated=pav*0.73

+printf("\n Energy generated=%f kWh",Energy_generated);