Mechanical Properties Of Fluids Question 6
Question 6 - 2024 (29 Jan Shift 1)
In a test experiment on a model aeroplane in wind tunnel, the flow speeds on the upper and lower surfaces of the wings are $70 ms^{-1}$ and $65 ms^{-1}$ respectively. If the wing area is $2 m^{2}$ the lift of the wing is $N$.
(Given density of air $=1.2 kg m^{-3}$ )
Show Answer
Answer: (810)
Solution:
$F=\frac{1}{2} \rho\left(v _1^{2}-v _2^{2}\right) A$
$F=\frac{1}{2} \times 1.2 \times\left(70^{2}-65^{2}\right) \times 2$
$=810 N$
