2. A typical football goal post is shown in the figure. The vertical support post has diameter 6 in, and the crossbar and vertical members have diameter 4 in. For a wind speed of 30 mph oriented normal to the structure, estimate the aerodynamic drag force acting on the structure. Use standard sea-level conditions p=0.002369 slugs/ft³ and 3.7372 x 10-7 slugs/ft-s. 18.5 ft 10 ft 30 ft Figure for problem 2.
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- A 30-cm-diameter smooth ball of density Phall = 210 kg/m³ is tied to an object on the bottom of a river as shown on the right. Determine the angle 0 when the speed of the river current is a. U = 1.66 m/s b. U = 0.13 m/s c. For which velocity, the drag coefficient is lower? Explain why? 30° Take the density and viscosity of water in the river Pwater = 1000 kg/m², µwater = 0.001 kg/m's. Neglect the weight of the cable and the drag on it. 400 200 100 80 60 40 20 10 0.8 0.6 0.4 0.2 0.08 0.06 2 4 68 10- 2 4 68 2 4 68 2 4 68 102 2 4 68 103 pvd 2 4 68 10 2 4 68 10 100 10 105 Reynolds number, Drag coefficient, CpA light aircraft is flying at a speed of 60 m/s in ISA conditions for an altitude of 2000 m. The aircraft has a mass of 750 kg and a rectangular planform (zero sweep) wing of 15 m? area, 9 m span and 160 mm thickness. Due to the fuselage, 85% of the wing is exposed to the air. A 20% increment should be applied to the friction factor to account for wing surface roughness, u= 1.750 x10 kg/ms. Calculate the skin friction drag coefficient for the wing. Keep 5 decimals.Note: Don't copy from other websites solution, those are wrong solutions. The trailer travels at U = 39 mi/h. The air is still and has a temperature of 60°F. Assume the surfaces are smooth and flat Consider both laminar and turbulent boundary layers. (Figure 1) Part A :Determine the drag acting on each side of the trailer truck.
- Do fast or Skip and allow others to work.3) An advertising sign mounted on the roof of a car is 33 inches tall, 15 inches wide and 54 inches long (airflow direction). The underside of the sign is flush with the top surface of the roof. Take air properties to be: p = 0.075 lbm/ft' and u= 1.22x10 lbm/ft.sec. Used a pressure drag coefficient of 1.2 for the advertisement sign. Calculate the total drag on the sign and the power required to overcome its effect if the car is travelling at a constant speed of a) 12 mph and b) 45 mph. Note: Provide a schematic diagram (sketch) of the problem configuration (if applicable). Every numerical calculation must be preceded by the appropriate equation. Do not forget units & dimensions during your calculations.Consider the boundary layer flow = 1 - (1 − 2)¹5, 0Consider the boundary layer flow=1-(1-)1.5, 0A portion of ship’s hull can be idealized as a flat plate, 100ft long. If the ship’s velocity is 10 ft/s and the properties of the water it is moving through are ρ=62.4lbm/ft³ and µ=3.0lbm/hr.ft, calculate the maximum boundary layer thickness.■ Consider a symmetric the aerofoil at an AOA, α. Apply thin aerofoil theory and show that the vorticity distribution is given by, y(0) = 2a√∞ (1+ cos 0) /sin 0 ■ Hence show that the circulation is, 1 And that the lift per unit span is: L= pV_r=2π pVac ■ What is the lift coefficient C/ ? ■ Show that the moment coefficient about the leading edge is: Cm.le = -0.25c₁A conventional low speed aircraft had the following aerodynamic characteristics: CDo=0.020. e=1.0 (Oswald efficiency). The aircraft was flown to maintain a steady level flight and for minimum thrust required, at a lift coefficient of Cz=0.8. The numerical value of the aspect ratio of the wing is three decimal places). (inNoneRecommended textbooks for youElements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University Press
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