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+ 
+ A source with strength 0.2m^3/s and a v 
+      ortex with strength 1 m^2/s are lo 
+      cated at the origin.Determine the  
+      equations for velocity potential a 
+      nd stream function.What are the ve 
+      locity components at x=1 m,y=0.5 m 
+      ?                                  
+ 
+ Solution:   
+ 
+ Vr=   
+ 
+    0.0284705  
+ 
+ m/s   
+ 
+ Vt=   
+ 
+    0.1423525  
+ 
+ m/s