An airplane travels with a constant horizontal velocity in a region where the density of air is 1.00 kg/m3. Each of the two wings of the plane has an area of 25 m2. If the speed of the air under the lower wing surface is 47 m/s, and that over the upper wing surface is 68 m/s, estimate the weight of the plane in pounds. (Assume that all of the weight is supported by the lift force provided by the wings.)
Answer: 14,000 lbs (7 tons)
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