Problem 4A smooth sphere of concrete with a diameter of 3 m is rolling in a slope at 9% (Ay/Ax) under the PacificOcean, at a constant terminal velocity. The rolling friction is calculated to be 2% of its weightunderwater. Determine the velocity of the sphere.Make sure to clearly explain how do you calculate the Cd of the sphere.Density of concrete: 2400 kg/m³Density of seawater: 1030 kg/m³Seawater

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Answered: Problem 4 A smooth sphere of concrete…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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PROBIEM 1 AssoHE A BONDARY LAYER FOR A Fluid OVER A F|AT PIATE CAN BE APPROKIMATED BY WHERE U= CONSTANT is THE FREE STREAM VelociTy AND S. S(x) is THE THICKNESS Of THE BON DARY LAYER. ) WHICH BOUNDARY CONDITIONS ARE SATISFIED AND WHICH ONES ARE NOT ? 2) calculATE S* AND g* 3) WRITE AN EXPRESSION FOR THEe wall STRESS, AS A PUNCTION OF U, S AND . WHERE Y is THE Visaosire OF THe Fluid. INDICATE THE DIRECTION OF THE STRESS. 4) OBTAIN AN EQJATION FOR S«) FROM THE MOMENTUM INTEGRAI EQUATION 5) OBTAIN S«)
(b) In two dimensional boundary layer, shear stress was changed linearly from the solid surface toward y-axis until it reach the value of zero at y = 6. Based on Table 2 and setting given to you; () Derive the equation of displacement thickness and momentum thickness using Von Karman Approximation Method ; and (ii) Determine the accuracy of this method in determining the value of displacement thickness and momentum thickness. Table 2 : Equation of Velocity Profile Setting Equation wU = 3(y/8)/2 – (y/8j?/2
9. The thin ( 3 mm ) thick plastic panel shown in the figure is lowered from a ship to a the Поог. The construction site on осean plastic panel weighs ( 200 N) in air and is ship Cble lowered at a rate of ( 2 m/s ). Assuming the panel remains vertically oriented, calculate ing the tension force in the cable. Take ( p = 1000 10 m/s ),e and use; water Plustic Punel kg/m', v 1.31 1/5 CDlam= 1.328 / Re. CDturb = 0.072 / Re
As given in the figure below, a square block weighing 1.1 kN has a 20° inclination and is 0.25 m x It moves on a 6 μm thick oil layer with a 0.25 m surface area. linear Calculate the maximum velocity the block can reach with a flow profile. (μoil = 7 x 10-3 Pa.s)
Q1) A new computer drive is proposed to have a disc, as shown in Fig. 1. The dise is to rotate at 9,000 rpm, and the reader head is to be positioned 0.011 in. above the surface of the disc. Estimate the shearing force on the reader head as a result of the air between the disc and the head. Use v air = 1.47 x 10-5 m2/s. Stationary reader head 6 mm dia. 9,000 rpm 0.011 mm 55 mm Rotating disc Fig. (1).
(b) In two-dimensional boundary layer, shear stress was changed linearly from the solid surface toward y-axis until it reaches the value of zero at y = 8. Based on Table 2 and setting given to you; (i) Derive the equation of displacement thickness and momentum thickness using Von Karman Approximation Method; and (ii) Determine the accuracy of this method in determining the value of displacement thickness and momentum thickness. Table 2: Equation of Velocity Profile Equation u/U = 3(y/8)/2 – (y/8)³/2 Setting 2
body diagram and complete solution pls
9. The thin ( 3 mm ) thick plastic panel shown in the figure is lowered from a ship to a site the floor. The construction on осean plastic panel weighs ( 200 N ) in air and is Cable lowered at a rate of ( 2 m/s ). Assuming the diys panel remains vertically oriented, calculate = 1000 ing the tension force in the cable. Take ( p = 1 10 m/s ), and water Plastic kg/m', v 1.31 use; %3D Punel 上. -3m. 1/2 1/5 Cplam = 1.328 / Re Cpturb = 0.072 / Rej.
O Mercury makres an angle of 130 with fespect to the Vertical when in contact with Clean qglass. Ho w far will mercury rse up or depress in e clean Imm-dicemeter tube? Take surface tensim 0=0.467 N/m, specific gravity Of mercury SaHg 13.6 end density Of weater p = loookg/m®. ) The sled Shown slides along a thin horizontal layer Of water between the ice and the runner. Ihe horizontal foree that the water exerts on the runner is 5. 4N. If the velocity f the runner is 17m/8 and the area Af the Kenner is O.0075m, determine the distence between the Sled renner and the ice Tere Visessity of water N =1-68X103rg)mas Et and defilke aA
Q1/ If the velocity profile of the boundary layer is = -:G) find the thickness of boundary %3D layer, the shear stress at trailing edge and the drag force on one side of plate 2 m long , if it is immersed in water flowing with velocity of 0.4 m/s (p = 998 , ū = 1.007*10-6 m2/s
Flat plate, moves at speed u0 over a fixed plate, with the intermediate layer consisting of oil. a) If the velocity profile isparabolic (u2 = a ∙ y) find the stress on the moving plate. b) What is its value if the velocity profile is linear.Result: α) τ=-μu0/2d, β) τ=-μu0/d
9. The thin ( 3 mm ) thick plastic panel shown in the figure is lowered from a ship to a construction site on the ocean floor. The plastic panel weighs ( 200 N) in air and is lowered at a rate of ( 2 m/s ). Assuming the ship Cble panel remains vertically oriented, calculate ing the tension force in the cable. Take ( p = 1000 * 10* m²/s ), and use; water Plastic funel kg/m', v = 1.31 m Colam = 1.328 / Re Cpturb = 0.072 / Re

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