Question

12-13

12. An airplane with wings surface area of 812.5 m2 is cruising in the air at a fixed altitude. The speed of the air below and above the wings are 50.0 m/s and 100.0 m/s respectively. If the density of air is 1.3 kg/m', the kinetic energy densities of the air below and above the wings are respectively A) 2.0 kg/(m.s)&8.0 kg/(m.s) B) 16.25 kg/(m.s)&65 kg/(m.) C) 32.5 kg/(m.s) &130 kg/(m.s D) 1625 kg/(m.s')&6500 kg/(m.s) E) 3250 kg/(m.s)&13000 kg/(m.s) Lower pressure Higher pressune A) 9750 N/m2 B) 4875 N/m C) 97.50 N/m D) 48.75 N/m2 E) 6.0 N/m

Answer 1