The large block shown is x = 72 cm wide, y = 54 cm long,V3and z = 9.0 cm high. This block is passing through air(density of air p = 1.43 kg/m³) at a speed of v = 7.98 m/s.Find the drag force Fa1 acting on the block when it has thevelocity v and a drag coefficient I = 0.902.レXFa1 =NV1Find the drag force Fa2 acting on the block when it has thevelocity v2 with a drag coefficient I = 0.992.Fa.2 => TOOLSFind theX10block when it has thevelocity vz with a drag coefficient I = 1.17. Fa.1 =NFind the drag force Fa2 acting on the block when it has thevelocity v2 with a drag coefficient I = 0.992.F4.2 =NTOOLSFind thex10block when it has thevelocity v3 with a drag coefficient I = 1.17.F43 =N

Given: x=72 cm y=54 cm z = 9 cm v=7.98m/s ρ - 1.43 kg/m3 To find: Drag force

Answered: The large block shown is x = 72 cm…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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An aircraft has a wing area of 70 m? and a wing loading of 2500 N/m2. The air density could be taken as 0.45 kg/m3. The drag equation for the aircraft is given as: Cp-0.016+0.055 C2 Calculate its minimum drag speed in m/s. Keep 2 decimals.
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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-)1.5, 0
D
You are designing an airfoil for a new hobby RC plane. Because of your limited knowledge, you have mistakenly approximated your airfoil as an ellipse with a = 75mm and b = 12mm. Here, “a” is the depth of your wing and “b” is the thickness. Your plane travels through the air at approximately 20mph (8.9m/s). As it does so, skin friction produces a drag-induced heat of 800W on your wind, of length 1m. Properties of Air: k = 0.025 W/mK, Pr = 0.72, v = 1.847 x 10−5, u = 16.84 x 10−6, p = 1.2 kg/m3, B = 1/Tf (ideal gas), TInfinity = 25oC a) What is the Reynold’s number? Hint: “D” is taken to be the thickness for an elliptical crosssection. b) What is the Nusselt number? c) What is the convection coefficient? d) What is the average temperature of your wing? Assume an ellipse perimeter of approximately 200mm.
For flow over a smooth plate, what approximately is the maximum length of the boundary layer if V_o = 9.0 m/s in the irrational uniform flow and the fluid is air? Water?
B) for the velocity profiles given below, state whether the boundary layer has separated or on the verge of separation or will remain attached ( i) u/U=2(y/8) -(y/8)² ii) u/U=-2(y/8) +0.5(y/8)³ iii) u/U-1.5(y/8) +0.5(y/8)³ Q3: Find the displacement, momentum thickness and energy thickness for the velocity distribution in the boundary layer: F u/U=0.5(y/8) + 1.5(y/8)³ Q4: A) Find the velocity distribution and expression of the maximum velocity and shear stress for a flow between two stationary plates. C B) A laminar flow of oil between two horizontal fixed parallel plates with a maximum velocity 2 m/s and 100mm apart. Canulate the pressure gradient and shear stress. Take µ-2.4525 s/m².

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