Question

An aeroplane of mass $3\times {10}^{4}kg$ and total wing area of $120m^2$ is in a level flight at some height. The difference in pressure between the upper and lower surfaces of its wings in kilopascals is :$(g=10m/s^2)$

• A. $2.5$
• B. $5.0$
• C. $10.0$
• D. $12.5$

Answer 1

The correct option is A $2.5$

Given,

$m=3\times {10}^{4}kg$

$g=10m/s^2$

$A=120m^2$

Upward force $=mg=\Delta P\times A$

$\Delta P=\frac{mg}{A}$

$\Delta P=\frac{3\times {10}^4\times 10}{120}$

$\Delta P=2.5kPa$

The correct option is A.