Answer:
A (81 N)
Explanation:
P = F/A, where P is the pressure on an object exerted by the force F over the area A. Using "D" to represent drag force specifically, this equation can be rearranged to D = CPA, where C is a constant of proportionality that represents the friction coefficient. The pressure exerted on an object undergoing motion through a fluid can be expressed as (1/2) ρv2, where ρ is the density of the fluid and v is the velocity by which the object is moving. Therefore, D = (1/2)(C)(ρ)(v²)(A).
V = 150 m/s, C(d) = 0.002, A = 3m², ρ(density of air) = 1.2 kg/m3
Fd = (1.2 x 3 x 0.002 x 150²)/2 = 81 kg.m/s²
The drag force exerted on the airfoil is 81 N.
