Properties Of Solids And Liquids Question 213
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
Options:
A)4095.0 Pascal
B)409.50 Pascal
C)40.950 Pascal
D) 4.0950 Pascal
Show Answer
Answer:
Correct Answer: A
Solution:
From the Bernoulli’s theorem $ P _{1}-P _{2}=\frac{1}{2}\rho (v _{2}^{2}-v _{1}^{2}) $
$ =\frac{1}{2}\times 1.3\times [{{(120)}^{2}}-{{(90)}^{2}}] $
$ =4095N/m^{2} $ or Pascal
