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+//Fluid Systems - By - Shiv Kumar
+//Chapter 11- Centrifugal Pumps
+//Example 11.1
+//To Find the Work done by the Impeller on the water per unit weight of water.
+
+     clc
+      clear
+
+//Given Data:-
+        Di=210;       //Internal diameter of Impeller, mm
+        Do=420;      // External diameter of Impeller, mm
+        N=1100;      //speed, rpm
+        beta_i=20;    //Vane Angle at Inlet, degrees
+        beta_o=30;    //Vane Angle at Outlet, degrees
+    //As water enters the impeller radially,
+        alpha_i=90;      //degrees
+
+
+//Data Used:-
+        g=9.81;       //Acceleration due to gravity, m/s^2
+
+
+//Computations:-
+         Di=Di/1000;      //m
+         Do=Do/1000;       //m
+
+        ui=%pi*Di*N/60;       //m/s
+        uo=%pi*Do*N/60;      //m/s
+        Vfi=ui*tand(beta_i);     //m/s
+        Vfo=Vfi;
+        Vwo=uo-Vfo/tand(beta_o);      //m/s
+        Work=Vwo*uo/g;       //N-m/N
+
+//Result:-
+      printf(" The Work done by the Impeller on the water per unit weight of water =%.2f N-m/N \n",Work)       //The answer vary due to round off error
+
+