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diff --git a/3835/CH9/EX9.11/Ex9_11.sce b/3835/CH9/EX9.11/Ex9_11.sce
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+clear
+//
+//given
+n=500
+v=250
+rsh=80
+ra=0.02
+drop=1.5
+//derived
+ish=3.125 //ish=v/rsh
+il=480 //il=w*1000/v
+ia=483.125 //ia=il+ish
+e=v+ra*ia+2*drop
+il=80
+ia=il-ish
+eb=v-ra*ia-2*drop
+n=(500*eb)/e //e is proportional to n
+printf("\n n= %0.1f rpm",n)