An aeroplane of mass $3 \times 10^4\,kg$ and total wing area of $120\,m^2$ is in a level flight at some height. The difference in pressure between the upper and lower surfaces of its wings in kilopascals is........... $kPa$ $(g=10\,m/s^2)$
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Level flight means net vertical force is zero
$\therefore$ $\mathrm{mg}=\Delta \mathrm{P} \times \mathrm{A}$
$\Delta P=\frac{m g}{A}=\frac{3 \times 10^{4} \times 10}{120}=2.5 \times 10^{3} P a=2.5 \mathrm{kPa}$
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