Question

An aeroplane of mass $5000$ kg is flying at an altitude of $3$ km. If the area of the wings is $50$ $m^2$ and pressure at the lower surface of wings is $0.6\times {10}^5$Pa, the pressure on the upper surface of wings is?(in pascal) $(g=10m{s}^{-2})$

• A. $59\times {10}^3$
• B. $2\times {10}^4$
• C. $6\times {10}^3$
• D. $59$

Answer 1

The correct option is A $59\times {10}^3$

weight of the aero plane and upthrust of plane

$mg=(P_2-P_1)A$

p1 is upper surface

p2 isw lower surface

A area cross sectional

$500\times 10=(0.6\times {10}^5-P_1)$

$P_1=0.6\times {10}^5-\frac{50000}{50}$

59000PA

$0.59\times {10}^{5}Pa$