試題詳解

38. The wing of an airplane has an area of 1 m² , and its wing thickness is 0.5 m. Air flows over the top at 20 m/s and under the wing at 10 m/s. The density of air is 1.2 kg/m³ . What is the net force on the wing due to Bernoulli effect? (Gravitational acceleration g = 10 m/s² )
(A) 12 N
(B) 15 N
(C) 18 N
(D) 183 N
(E) 186 N