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diff --git a/2021/CH20/EX20.6/EX20_6.pdf b/2021/CH20/EX20.6/EX20_6.pdf
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diff --git a/2021/CH20/EX20.6/EX20_6.sce b/2021/CH20/EX20.6/EX20_6.sce
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+//Finding of Maximum Speed
+//Given
+D=0.125;
+L=0.3;
+hs=4.5;
+ds=0.075;
+l=6.8;
+h=2.6;
+g=9.81;
+H=10.3;
+//TO Find
+A=(%pi/4)*D^2;
+a=(%pi/4)*(ds)^2;
+r=L/2;
+ha=H-h-hs;
+Z=(ha*g*a)/(l*A*r);
+Z1=sqrt(Z);
+N=(Z1*60)/(2*%pi);
+disp("Maximum Speed ="+string(N)+" rpm");