2. A thin, flat-plate wing of a model airplane is placed in a wind tunnel with an airspeed of 20 m/s, a free stream pressure of 100 kPa, a free stream temperature of 290 K and a absolute viscosity of 1.8 x 10 kg/[m-s). The rectangular wing has a chord of 0.5 m and a span of 5 m. Determine the following: a) The Reynolds number at the TE. b) The upper surface boundary layer height at the TE assuming laminar flow. c) The skin friction drag of the wing assuming laminar. Hint: the wing has an upper and lower surface