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+clc;
+//Example 9.1
+//page no 87
+printf("Example 9.1 page no 87\n\n");
+//a horizontal water jet impinges on avertical plate
+rho=62.4//density of water
+v=100//horizontal velocity of water
+q=0.5//flow rate
+g=32.2//gravitational constant
+printf("\n density rho=%f lb/ft^3\n horizontal velocity of water v=%f ft/s\n flow rate q=%f ft^3/s",rho,v,q);
+M_in=(rho*q*v)/g//momentum rate of inlet water in the horizontal direction
+printf("\n momentum rate M_in=%f lbf",M_in);
+M_out=0//momentum rate of water out
+F=M_out-M_in
+printf("\n net horizontal force F=%f lbf",F);
+//negative sign indicate that to hold the plate in place, a force must be exerted in a direction opposite to that of the water flow