initial commit / add all books

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diff --git a/2021/CH12/EX12.4/EX12_4.pdf b/2021/CH12/EX12.4/EX12_4.pdf
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diff --git a/2021/CH12/EX12.4/EX12_4.sce b/2021/CH12/EX12.4/EX12_4.sce
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+//Finding of  Power Lost 

+//Given

+D=0.6;

+L=1000;

+Q=0.6;

+ks=0.003;

+rho=1000;

+g=9.81;

+c=50;

+//To Find

+//For Turbulant Flow

+A=(%pi/4)*D^2;

+a=2*log(3.71*(D/ks));

+b=sqrt(a);

+v=Q/A;

+f=1/c;

+Hf=(f*L*v^2)/(2*g*D);

+P=(rho*g*Q*Hf)/1000;

+disp(" Power Lost ="+string(P)+" Kilowatt");