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  • The velocities on lower and upper surface of an aeroplane wing are 10 m/s. and 20 m/s respectively. If area of the wing is 10m², lift force on the aeroplane. Density of air 1.2 kg/m³.

The velocities on lower and upper surface of an aeroplane wing are 10 m/s. and 20 m/s respectively. If area of the wing is 10m², lift force on the aeroplane. Density of air 1.2 kg/m³.

Option: 1

2500N


Option: 2

1200N


Option: 3

1800N


Option: 4

1600N


Answers (1)

best_answer

\begin{aligned} & F=\frac{1}{2} \rho_{\text {air }}\left(V_1^2-V_2^2\right) \cdot A \\ & F=\frac{1}{2} \times 1.2\left(20^2-10^2\right) \times 10 \\ & F=1800 \mathrm{~N} \end{aligned}

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