The model in a low-speed wind tunnel is a rectangular wing that spans the entire test section. the wing has a naca 63-210 airfoil section and a chord of 0.145 m and span of 1.0 m. the airflow has the following properties; p = 1.01(10)5 pa, t = 300 k, and v = 70 m/s. the lift generated by the wing is 250 n. determine the angle of attack of the wing.

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day

the correct answer is "inertia"