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+//Exa 10.9
+clc;
+clear;
+close;
+//Given data :
+L=250;//m
+D=1.42;//cm
+wc=1.09;//kg/m
+Pw=37.8;//kg/m^2(Wind pressure)
+r=1.25;//cm
+Lis=1.43;//m(insulator string length)
+Clearance=7.62;//m
+rho_i=913.5;//kg/m^3(density of ice)
+stress=1050;//kg/cm^2
+T=stress*%pi/4*D^2;//kg
+wi=rho_i*%pi*r*10^-2*(D+r)*10^-2;//kg
+w_w=Pw*(D+2*r)*10^-2;//kg
+wr=sqrt((wc+wi)^2+w_w^2);//kg(Resultant force per m length of conductor)
+Smax=wr*L^2/8/T;//max sag in air
+disp(Smax,"Sag in inclined direction(meter)");
+Sdash=Smax*(wc+wi)/wr;//max sag in air
+disp(Sdash,"Sag in vertical direction(meter)");
+h=Clearance+Sdash+Lis;//m
+disp(h,"Height of lowest cross arm(m)");