Answer :

The Bernoulli’s theorem states the relation,


Pa + Va2= Pb + Vb2


Thus we get,


Pa – Pb =(va2 – vb2) …..(i)


Where,


‘Pa’ is the pressure on the upper surface of the wing


‘Pb’ is the pressure on the lower surface of the wing.


‘v1’ is the speed on the upper surface of the wing.


‘v2’ is the speed on the lower surface of the wing.


‘ρ’ is the density of the air.


The reason for the lift of the airplane is the difference between the pressure differences between the upper and lower surface,


Thus,


The force which is responsible for the airplane lift, F = (Pb-Pa) A


Replacing the value of Pressure difference from equation (i),


F = (va2– vb2) A


Given,


Speed of the wind on the upper surface, v1 = 70 m/s


Speed of the wind on the lower surface , v2 = 63 m/s


Area of the wing, A = 2.5 m2


Density of the air, ρ = 1.3 kg / m3



F = 1512.87 N = 1.512 × 103 N


the lift on the wing of the airplane is 1.512 × 103 N.


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