**Problem 3:** An aero plane wing is designed so that when the speed of the air across the top of the wing is 450 ms^{-1}, the speed of air below the wing is 410 ms^{-1}. What is the pressure difference between the top and bottom of the wing?

**Solution**

**Given data** Speed of air on the top of the wing = v_{1} = 450 ms^{-1}

Pressure
on the top of the wing = P_{1} (say)

Speed
of air on the bottom of the wing = v_{2} = 410 ms^{-1}

Pressure
at the bottom the wing = P_{2} (say)

**Required **P_{2} – P_{1}=?

**Formula **Bernoulli’s equation (assuming there is no significant difference in the height h of the two sides of the wing) given by

We know the density of air = ρ = 1.29 kg m^{-3}

Put all these values in the formula.

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