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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]
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