n a test experiment on a model airplane in a wind tunnel, the flow speeds on the upper and lower surfaces of the wing are 70 m s-1 and 63 m s-1 respectively. What is the lift on the wing if its area is 2.5 m2 ? Take the density of air to be 1.3 kg m-3.

Explanation

Here υ1 70 ms-1, υ2 = 63 ms ‘, p = 1.3 kg m 3 and A = 2.5 m2.
Now, using Bernoulli’s theorem (for constant height),