Question

The pressure on the top surface of an aeroplane wing is $0.8\times {10}^{5}Pa$ and the pressure on the bottom surface is $0.75\times {10}^{5}Pa$. If the area of each surface is $50m^2$, the dynamic lift on the wing is

• A. $25\times {10}^{4}N$
• B. $0.5\times {10}^{4}N$
• C. $5\times {10}^{4}N$
• D. $0.25\times {10}^{5}N$

Answer 1

The correct option is A $25\times {10}^{4}N$

Difference in pressure of top and bottom surface $=500Pa$
Area $=50m^2$
So, Dynamic lift $=pressuredifference\times Area$
$=5000\times 50N$
$=25\times {10}^{4}N$