Problem 4:A tourist on the observation deck of the Empire State Building drops a penny. The coin, a disk ofdiameter D = 0.75 in, thickness h = 0.06 in and density p. = 11.2 slug/ft², falls to the ground from a heightof H = 1250 ft at a velocity of U(t). Assuming the penny falls broadside-on it has a drag coefficient givenby:64*(1+0.138Reg.792)RepAnd a reference area ofD²A==Area has a density of p. = 2.32*10 slug/ft³ and a viscosity, H.-3.76*10 slug/(ft*s). The gravitationalacceleration is g = 32.2 ft/s².Part A: Draw the free body diagram where you show the forces acting on the coin: buoyancy, weight anddrag.Part B: Find the coin's terminal velocity and the time it takes to reach the ground (assuming it instantlyreaches terminal velocity).Part C: Determine the drag force exerted on the coin.Part D: After reaching its terminal velocity, the coin suddenly undergoes a rotation instability causing itto fall edgewise. What is the new drag force? Ignore pressure drag and the coin's finite thickness.

Answered: Image /qna-images/answer/a73e9dca-753c-4388-a8b5-fc87d4a86d6d.jpg

Answered: Problem 4: A tourist on the observation…

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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Thank you!! An aircraft weighing 65.2 kN when empty has a wing plan form area A of 62.3 m^2 . It cruises at a velocity of 900 km/h and a 4.0 degree angle of attack and altitude of 8500m. Also, the wing characteristics of the airfoil are shown. (a) Determine the allowable weigh of the cargo (b) and if the wingspan s is 20m determine the induce drag coefficient C_Di.
Aircraft flying at an altitude of (3 Km) with a velocity of (100 m/sec). The planform area of the wing is (206 m² ). Find the overall drag force acting on this aircraft if you have the following data :- Aspect ratio= 10, Weight of the aircraft = 7.5 x 105 kg.m/s² Span efficiency factor = 0.95 Wing cross section is NACA 4412 airfoll Drag coefficient = 0.006
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.
Problem 4. A cork ball (SG = 0.21) with a diameter of D = 0.30 m is tied to an object on the bottom of a river as %3D shown. (a) For an angle of B = 30°, estimate the speed of the river current neglecting the weight of the cable and the drag on it. (b) Briefly discuss how the angle changes for a range of speeds from 0.4 m/s to 10 m/s. U
The original Flettner rotor ship was approximately 100 ftlong, displaced 800 tons, and had a wetted area of 3500 ft2. Assketched in Fig. , it had two rotors 50 ft high and 9 ft indiameter rotating at 750 r/min, which is far outside the range. The measured lift and drag coefficients for eachrotor were about 10 and 4, respectively. If the ship is mooredand subjected to a crosswind of 25 ft/s, as in Fig. whatwill the wind force parallel and normal to the ship centerlinebe? Estimate the power required to drive the rotors.
solve this
A flagpole 16 m high has the shape of a cylinder 100 mm in diameter. The air temperature is 30°C and the atmospheric pressure is 101 KPaa. With what speed is the air blowing against the pole if the moment developed at the base is 2.7 KN.m? The drag coefficient is 1.3.
The large block shown is x = 72 cm wide, y = 54 cm long, V3 and 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 the velocity v and a drag coefficient I = 0.902. レ X Fa1 = N V1 Find the drag force Fa2 acting on the block when it has the velocity v2 with a drag coefficient I = 0.992. Fa.2 = > TOOLS Find the X10 block when it has the velocity vz with a drag coefficient I = 1.17.
V 13 u . The velocity profile for boundary layer over a 3 y 1 13 y Ux flat plate is given by, u. 2 8x 2 8x 280 Vx where, 8x = 13 u (a) Develop the expression for friction coefficient. (b) Find the expression for average drag coefficient over length L.
Problem 3. A tractor-trailer rig has a frontal area of A = 102 ft² and drag coefficient CD = 0.9. The ratio of rolling resistance to vehicle weight is CR = FR/W = (6 lbf)/(1000 lbf). The specific fuel consumption (defined as mass of fuel consumed divided by power, or thrust, produced times the time period) for the diesel engine is SFC= mƒ/(P▲t) = 0.34 lbm/(hp hr) and the drivetrain efficiency is na = 92%. The density of diesel fuel is pf = 6.9 lbm/gal. (a) Estimate the fuel economy, FE, for a rig traveling at a speed of U = 55 mph with a weight of W = 72,000 lbs. (b) For a fairing system that reduces the aerodynamic drag by 15%, estimate the improved fuel economy, FE faired. (c) Calculate the annual fuel savings, FS, for a rig that travels 120,000 miles per year. (d) Plot FE and FEƒ faired versus speed, U, assuming SFC and nd are constant.
Kindly give me both right solutions with clear calculations The drag polar of a glider is given by CD=0.01+0.022CL2 . If it is launched from a height of 400m in still air. Please determine:(a) the maximum lift to drag ratio ??;(b) the greatest possible ground distance it can cover.

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