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+//Example 11-4 Drag Force Acting on a Pipe in a River
+D = 2.2 //outer-diameter of pipe [cm]
+L = 30 //width of section of the river [m]
+V = 4 //average velocity of water [m/s]
+T = 15 //temperature of water [C]
+//properties of water at 15 C
+rho = 999.1 //density [kg/m^3]
+mu = 1.138 * 10**-3 //dynamic viscosity [kg/m.s]