Physics
Fluid-Mechanics
Easy

Question

The speed of flow past the lower surface of a wing of an aeroplane is 50 ms-1. What speed of flow over the upper surface will give a dynamic lift of 1000 Pa? Density of
airequals 1.3 kgm to the power of negative 3 end exponent.

  1. 25.55 m / s
  2. 63.55 m / s
  3. 13.25 m / s
  4. None

The correct answer is: 63.55 m / s


    Applying Bernoulli's theorem to the lower and upper surface of a wing
    table attributes columnalign left columnspacing 1em rowspacing 4 pt end attributes row cell P subscript 1 plus 1 half rho v subscript 1 superscript 2 equals P subscript 2 plus 1 half rho v subscript 2 superscript 2 end cell row cell not stretchy rightwards double arrow space of 1em 1000 equals 1 half cross times 1.30 left parenthesis v subscript 2 superscript 2 minus 50 squared right parenthesis left square bracket because text lift end text equals P subscript 1 minus P subscript 2 right square bracket end cell row cell v subscript 2 equals 63.55 straight m divided by straight s end cell end table

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