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An aeroplane ...

Question

An aeroplane of mass 3 $\times$ 10 $^{4}$ kg and total wing area 120m $^{2}$ is in a level flight at same height.The difference in pressure between the upper and lower surface of its wings in Kilo Pascal is( g $=$ 10 ms $^{- 2}$ ):

A

2.5

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B

5

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C

10

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D

12.5

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Solution

The correct option is A 2.5
Weight of plane = pressure force
$3 \times 10^{4} \times g = (P_{1} - P_{2}) A$ , $a r e a = 120 m^{2}$
$(P_{1} - P_{2}) = 2500 p a s c a l = 2.5 K i l o p a s c a l$

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