3. Suppose the drag force on a truck is given by the equation: F = cqv² + c2v where c = 4.80 N and cz = 111.8 . Check that this relationship is plausible. Do the units work out? (a) Calculate the required propulsive power at a speed of 55 mi/hr. Express your final answer in Hp. Recall that 1Hp = 745.7 W. (b) Calculate the required propulsive power at a speed of 80 mi/hr. (c) Is the ratio of required powers proportional to the ratio of given speeds? Surprised? Or not?

4. The Wright brothers used a very thin wing on their 1903 flyer. In addition, they made extensive use of a homebuilt wind tunnel to test their wing designs. span, b chord, c Model of Wright Flyer (a) The Wright's wind-tunnel models had chord length, c, of about 0.04 m and wing span (length) of 0.26 m. The wind tunnel operated at approximately the same wind speed as the full-scale aircraft - about 13 m/s. Estimate the drag (friction) of a single wind-tunnel model wing under standard conditions (o = 1.225 kg/m³, = 1.7894 x 10-³ kg/s-m). Note that the wing is mounted in the wind tunnel so that both upper and lower surfaces are exposed to the flow. (b) The full-scale 1903 flyer had a chord length of 1.9 m and a wing span of 12.3 m. Estimate the drag (friction) of a single full-scale Wright flyer wing flying at 13 m/s under standard atmospheric conditions. (c) Consider the main wing configuration, which consisted of two wing surfaces (biplane) connected by 18¹ cylindrical rods. We will…

2/A- Airbus 320 fly in steady level flight with altitude 10.5 km and the density at this level p=0.3877 kg/m³, mass of aircraft 6500 kg, wing area 124 m², CD = 0.015+ 0.02 CL², maximum thrust at sea level 53.015 kN. Calculate maximum velocity. C00

A small model water turbine is tested in a flume where Cp is measured to be 0.38. Assuming dynamic similarity exists, calculate the power output of a full-size turbine of diameter 12 m operating in a tidal stream, where the water density is 1030 kg/m³, μ = 1.307-³ Ns/m² and maximum water velocity of 2.2 m/s.