Amodel airplane has a wing span of 3 ft and a chord (leading edge-trailing edge distance) of 5 in. the model flies in air at 60f and atmospheric pressure. the wing can be regarded as a flat plate so far as surface drag is concerned. at what speed will a turbulent boundary layer start to develop on the wing

10 kg of co2 is initially contained at 400 kpa and 300 k. the gas constant for carbon dioxide is 189 j/lkg k) and has a specific heat ratio, k, of 1.289. isentropic expansion then occurs until the pressure is 200 kpa. a) determine the initial volume of co2 in m. b) determine the final temperature in k. c) determine the work done by the system during the expansion kl.