initial commit / add all books

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+//Finding of Angle ,Diameter ,Width

+//Given

+E=0.75;

+P=147.15;

+H=8;

+N=200;

+Vw1=0;

+Cv=0.3;

+g=9.81;

+rho=1000;

+//To Find

+u=Cv*sqrt(2*g*H);

+Vf=0.96*sqrt(2*g*H);

+E1=0.8;

+Vw=(E1*g*H)/u;

+a=atand(Vf/Vw);

+b=atand(Vf/(Vw-u));

+D=(60*u)/(%pi*N);

+Q=(E1*P*1000)/(E*rho*Vw*u);

+B=Q/(%pi*D*Vf);

+disp("Diameter ="+string(D)+" meter");

+disp(" Inlet angle ="+string(a)+" degrees");

+disp(" Outlet angle ="+string(b)+" degrees");

+disp("Width ="+string(B)+" meter");

diff --git a/2021/CH18/EX18.11/Ex18_11.pdf b/2021/CH18/EX18.11/Ex18_11.pdf
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+++ b/2021/CH18/EX18.11/Ex18_11.pdf