Answer:
4°
Explanation:
Given,
chord in the airstream, c = 2 m
speed, v = 50 m/s
lift per unit span = 1353 N/m
density of air, ρ = 1.225 kg/m³
Lift,[tex]L = c_L \times \dfrac{1}{2} \rho v^2(c \times s)[/tex]
[tex]\dfrac{L}{s}=c_L \times \dfrac{1}{2} \rho v^2\times c[/tex]
[tex]50=c_L \times 0.5\times 1.225\times 50^2\times 2[/tex]
[tex]c_L = 0.44[/tex]
From the plot of c_L and angle of attack
Angle of attack is equal to 4°
