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20 April, 12:40

In 1923, the United States Army (there was no United States Air Force at that time) set a record for in-flight refueling of airplanes. Using two refueling planes, an Airco DH-4B biplane was able to remain in flight for 37 h. During the flight, the refueling planes were able to air-transfer a total of 687 gallons of fuel to the plane in 9 refueling transfers. Assume that the refueling nozzle had a diameter of 1.45 in and each refueling took 2.45 min to perform. Calculate the velocity of the fuel through the nozzle. Assume that the fuel filled the entire cross-sectional area of the nozzle.

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  1. 20 April, 12:57
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    Total time of transfer oil fuel = 2.45 x 9 = 22.05 minutes

    = 22.05 x 60

    = 1323 s

    Total volume of ful transferred = 687 gallon

    =.0037854 x 687

    = 2.6 m³

    radius of pipe =.5 x 1.45 inch

    =.5 x 1.45 x 2.54 x 10⁻² m

    r =.018415 m

    cross sectional area

    = π r²

    a = 3.14 x. 018415²

    = 10.648 x 10⁻⁴ m²

    If v be the velocity

    volume of fuel coming out a x v x t, a is cross sectional area, v is velocity and t is time.

    10.648 x 10⁻⁴ x v x 1323 = 2.6

    v = 1.845 m / s
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