Exhaust (assumed to have the properties of standard air) leaves the 4-ft-diameter chimney shown in Fig. P12.12 with a velocity of 6 ft/s. Because of the wind, after a few diameters downstream the exhaust flows in a horizontal direction with the speed of the wind, 15 ft/s. Determine the horizontal component of the force that the blowing wind puts on the exhaust gases.
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