A sphere (Cd = 0.2) 1 ft in diameter travels at 100 ft/sec in standard atmospheric air. What is the drag force? A. 0.0117 lbf C. 0.0712 lbf B. 0.0217 lbf D. 0.0127 lbf
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A sphere (Cd = 0.2) 1 ft in diameter travels at 100 ft/sec in standard
atmospheric air. What is the drag force?
A. 0.0117 lbf C. 0.0712 lbf
B. 0.0217 lbf D. 0.0127 lbf
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- The drag polar equation of a light airplane in clean configuration can be written as Cp = 0.358 + 0.0405 C₁². It has a weight of 18,681 N. The wing area is 14.41 m². Calculate the minimum power required in watts. (Round off answer with no decimal places, No units, No commas) Answer given: 1461792 A 5,000 lbs. aircraft has an excess power of 75 hp at sea level. If the service ceiling is 3,657.6 m, determine the time to climb from sea level to absolute ceiling in minutes. (Round off answer with no decimal places. No units, No commas) Answer given: 178.) A circular cylinder 4m long and 3m in diameter is in an air stream. The flow velocity is 5 m/s L parallel to the axis of the cylinder. Given that the coefficient of drag, CD on the cylinder is 1.3, and the density of air is 1.225 kg/m3. What is the force on the cylinder? A. 0.090 KN B. 0.14 KN C. 0.24 KN D. 0.91 kNQustion. An aircraft is flying in level flight at a speed of 200 km/h through air (density, p = 1.2 kg/m³, and viscosity, μ = 1.6 x 10-5 N-s/m²). The lift coefficient at this speed is 0.4 and the drag coefficient is 0.0065. The mass of the aircraft is 800 kg. The effective lift area of the aircraft NOTE= Do not give wrong answer I will dislike , If not sure skip it
- 1- During the take-off phase of the flight of an aeroplane, drag acting on the aeroplane is mainly because of: i) Friction drag. i) Pressure drag. i) Formation of the boundary layer. iv) Tip vortices. 2- Which of the following statements is true? i) The drag of a streamlined object is always less than that of an equivalent blunt object. ii) The drag of a streamlined object is always more than that of an equivalent blunt object. ii) The drag of a streamlined object is more than that of an equivalent blunt object at high Reynolds numbers. The drag of a streamlined object is more than that of an equivalent iv) blunt object at low Reynolds numbers. 3- The transition of the laminar flows over wing of civilian aeroplanes can be delayed by: i) Applying adverse pressure gradient. i) Moving the poiht of the maximum thickness towards the leading edge. i) Heating up the flow. iv) Moving the point of the maximum thickness towards the trailing edge. 4- Which of the following statements is true? i)…At an altitude of 20000 ft, an actual air density is measured to be 1.011 x 10-3 slugs/ft3, whereas ISA density value would be 1.267 x 10-3 slugs/ft3. Which of the following statements is true? A. The atmosphere in the situation is non-standard B. The density altitude of 1.267 x 10-3 slugs/ft3 air density is some other altitude C. All of the choices D. The density altitude of 1.011 x 10-3 slugs/ft3 air density is 20000 ft#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 he = 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.
- If your lift to drag ratio is 15 for airline A flight and the airplane weighs 15,000-lb for L/Dmax, what’s the speed for L/Dmax at 22,500 lbs.?The Reynold's number of a sphere falling in air is 1E6. If the sphere's radius is 1ft, what is its velocity? Density of air is 0.00234 slug/ft³ and viscosity of air is 3.8E-7 lbf-sec/ft²A. 2.5 ft/sB. 5.1 ft/sC. 40.6 ft/sD. 81.2 ft/sWhich of the statements/is/are true concerning the friction factor for solid spheres and cylinders immersed in a flowing fluid? I. Such friction factors are traditionally referred to as (dimensionless) drag coefficient denoted by CD. II. At Reynolds number much as less than 1, the relationship CD=24/Re is valid and CD is inversely proportional to Re. III. The characteristic area A* used in the definition of these friction factor is the surface area of the object. Statement I only Statement II only Statement III only Statement I and II only All three statements are true
- The drag coefficient for a car with a frontal area of 26 ft? is being measured in an 8 ft x 8 ft wind tunnel. The density of air under the test conditions is 2.4 x 10 3 slugs/ft, When the air flow rate is, 500,000 ft/min, the drag force on the car was measured to be 170 lb. The drag coefficient under the test conditions is most nearly O 0.30 O 0.32 O 0.28 O 0.34A propeller driven aircraft has the following parabolic non-dimensional drag curve: CD = 0.015 + 0.070 CL2 At what lift coefficient will the aircraft have its fastest rate of climb? Round your answer to one decimal400 200 100 Determine the form drag experiences by a truck traveling at a speed of 80 miles/hr with length scale of 20ft and 4 ft width. Assume it can be 60 40 20 10 eylinder 0.6 04 Seth he 02 approximated as a smooth sphere. 0.1 0.06 Tot 10 10 10