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.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Fluids Q6
EX in Asteel of speçific weight cy lin der (1"diametar andiz" Long) (8) =490 1b fI Ft3 fall be Cause of its own weight, at q uniform slig htly 9. rate of on5 HIs in side a tube of larger diameter.A Castor- oil film M = 6x lo -3 16 between t-s Constant thihness and the tube between of %3D is the cylinder Determine the cleamanCe (y) in ft the Cylinder and the tube-
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).
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
Engineering a highway curve. If a car goes through a curve toofast, the car tends to slide out of the curve. For a banked curve withfriction, a frictional force acts on a fast car to oppose the tendencyto slide out of the curve; the force is directed down the bank (in thedirection water would drain). Consider a circular curve of radiusR =200 m and bank angle u, where the coefficient of static frictionbetween tires and pavement is ms. A car (without negative lift) isdriven around the curve . (a) Find an expressionfor the car speed vmax that puts the car on the verge of slidingout. (b) On the same graph, plot vmax versus angle u for the range 0to 50, first for ms =0.60 (dry pavement) and then forms =0.050 (wet or icy pavement). In kilometers per hour, evaluatevmax for a bank angle of u =10 and for (c) ms 0.60 and (d) ms 0.050. (Now you can see why accidents occur in highway curveswhen icy conditions are not obvious to drivers, who tend to drive atnormal speeds.)
can you please find the solution for the que: 1.48
A 0.5 m x 2 m flat plate is towed at 5 m/s on a 2-mm-thick layer of SAE-30 oil at 38°C that separates it from a flat surface. The velocity distribution between the plate and the surface is assumed to be lincar. What force is required if the plate and surface are horizontal? 1.4
k=5 A sloped surface covered with oil is shown in the figure below. For the given conditions, calculate the specific mass of the block. Oil layer thickness t-0.5 mm 15 cm Cube Block a=30°7 Pol = 750 + kx 15 kg/m³ Vail =( 15-k/10)x104m²/s V = (k/10+0.5) m/s
If a jet is inclined upward 30 degrees from the horizontal, what must be its velocity to reach over 3m wall at a horizontal distance 18m, neglecting friction?
The man shown in (Figure 1) blows air through the 3-mm diameter straw with a velocity of 2.8 m/s. Assume fully developed flow occurs along the straw. The temperature of the air is 20°C. Figure -225 mm- 1 of 1 > T Part A Determine the force his lips exert on the straw to hold it in place. Express your answer using three significant figures and include the appropriate units. P-6.673 HA Provide Feedback N ? ubmit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining
For flowing water at 10°C, what is the magnitude of the velocity gradient needed to produce a shear stress of 0.7 N/m²? du/dy = i s¹.
Problem 3: Let's say you have a flat plate, placed on the table. The coefficient of friction is 0.20. The mass of the plate is 0.2 kg. It has a length of 2 m and the width of 1 m. Next you have air at 200C flowing over the top surface with velocity of 25 m/s. You have a small metal rod that holding the plate in place. What is the force on the rod necessary to keep the plate from moving. Support Rod Plate Table The friction drag for mixed flow can be calculated using: 0.455 FD= (log Rez) 2.58 (1/2)pU (bL)- 0.0740 (Rez)a (1/2)pʊ² (bza) 1.328 + (1/2)p (b) √(Rez) The friction drag for laminar flow can be calculated using: 0.664bpU³L FDI- ✓REL TTI -M 1500 H -" -00 " " 1000 1000 1305 11310 G

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