#1. Consider a Boeing 747-700 in straight-and-level cruise flight on a standard day. The aircraft has a wing area of 525 m and is flying geometric altitude of hc = 10,000 m. At a certain time during the flight, its mass is 3.5 x 105 kg and each of the four engines produces 50 kN of thrust. C was calculated as 0.4. a) Determine the cruise airspeed. b) Determine the total drag coefficient.

A model of an aircraft is being tested in a wind-tunnel.  If the model was replaced by one that is half the size but is otherwise identical, what would be the ratio of the drag on the large model to the drag on the small model for exactly the same flow conditions.  Give your answer to two decimal places.  The model is in a region where drag coefficent is independent of Reynolds number.

Semester on QUESTIONS QI) A small airplane has a total mass of 2000 kg and a wing area of 56 m². Speed of it is 290 km/h. Determine the lift and drag coefficient. (The density of standard air at an altitude of 5000 m is p0.802 kg/m³)

Using the information given in Table 10.4, determine the ratio of local pressure and density to sea-level values. Estimate the value of air density at the cruising altitude of most commercial airliners.

B2 is flying at an altitude of 43,000 ft and a speed of 400 KTAS under standard atmospheric conditions. If the average aerodynamic chord is 39,6 ft, calculate the Reynolds number and the average % aerodynamic chord present on the wing

A professional baseball pitcher can project a baseball atca speed as high as 35 m/s. 1.If air resistance can be ignored, how high in metres would a baseball launched at this speed rise if projected straight up? 2.How long would the baseball be in the air (in seconds)

(c) In a wind tunnel experiment, a drag force on 1:8 scale model billboard is 1 kN. The air in the wind tunnel is 20 degree Celsius. During a storm, the wind speed can reach 20 km/hr with air temperature of 10 degree Celsius. Determine the drag force experience by the billboard during storm. Refer Appendix B.

Strictly don't use chatgpt for this question.

Problem 3: Let's say you want to predict the aerodynamic drag of a new car based on the use of a model that is one- fifth scale of the actual car/prototype car. We want to predict the drag of the car when it has wind velocity 75 miles/hour with an air temperature of 40°C. The model is placed in a wind tunnel at 10°C. Determine the wind tunnel velocity necessary to achieve similarity between the model and the prototype.

Problem 2 A Beechcraft Bonanza wing has the following dimensions: - chord = 1.4 m; - span (wing tip to wing tip) = 7m and - wing is roughly rectangular in shape. This plane is flying at 30 m/sec under standard sea level conditions. Model this wing as a flat plate for boundary layer analysis. a) Calculate the Reynolds number for the wing. b) Calculate the boundary layer thickness at the trailing edge of the wing assuming fully laminar flow. c) Calculate the boundary layer thickness at the trailing edge of the wing assuming fully turbulent flow. d) Calculate the skin friction drag on the full wing assuming laminar flow transitions to turbulent flow at a critical Reynolds number = 5.8 x 105.