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+clear
+clc
+//Example 3.10 FORCE TO OPEN AN ELLIPTICAL GATE
+g_water=9810; //specific weight of water[N/m^3]
+z_cen=10; //[m]
+p=(g_water*z_cen)/10^3 //pressure at the centroid level[kPa]
+a=2.5; //[m]
+b=2; //[m]
+A=%pi*a*b //area[m^2]
+Fp=p*A/10^3//resultant force[MN]
+I=%pi*a^3*b/4 //moment of inertia[m^4]
+y=12.5; //slant distance from the water surface to centroid[m]
+del_y=I/(y*A)//distance from center to center of pressure[m]
+//Moment equilibrium about the hinge
+F=Fp*10^3*(a+del_y)/(2*a) //force[kN]
+printf("\nThe normal force F required to open the gate = %.f kN.\n",F)
+\ No newline at end of file