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+// A Textbook of Fluid Mecahnics and Hydraulic Machines - By R K Bansal
+// Chapter 3-Hydrostatic Forces on surfaces
+// Problem 3.5
+
+//Data given in the Problem
+d=4
+A=%pi/4*d
+SG=0.87
+dens=SG*1000
+g=9.81
+
+//Calculations
+w=dens*g
+p=19.6*10^4
+p_head=p/w
+//1)Force exerted
+F=dens*g*4*%pi*p_head
+mprintf("The Force exerted is %f MN\n",F*10^-6)
+//2)centre of Pressure
+IG=%pi/64*d^4
+h=IG/(A*p_head)+p_head
+mprintf("the Position of COP is %f m",h)