Question

Air is streaming past a horizontal air plane wing such that its speed in 120 m/s over the upper surface and 90 m/s at the lower surface. If the density of air is 1.3 kg per metre³ and the wing is 10 m long and has an average width of 2 m, then the difference of the pressure on the two sides of the wing of

• A. 4095.0 Pascal
• B. 409.50 Pascal
• C. 40.950 Pascal
• D. 4.0950 Pasca

Answer 1

Answer: (A)

4095.0 Pascal

Answer 2

From the Bernoulli's theorem

$= \frac { 1 } { 2 } \times 1.3 \times \left[ ( 120 ) ^ { 2 } - ( 90 ) ^ { 2 } \right] = 4095 \mathrm {~N} / \mathrm { m } ^ { 2 }$ or Pasca