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+// problem 9.6
+D=0.08
+s=0.15
+Hs=3
+ds=0.03
+g=9.81
+Ls=4.5
+p=78.86*(1000)
+w=9810
+W=2*3.142/60
+z=(D/ds)^2
+Hsep=p/w
+Habs=10.3-Hsep
+Has=Hsep-Hs
+N=((Has*g*2)/(z*W*W*s*Ls))^0.5
+disp(N,"maximium speed in rpm at which may run without separation")