Two large plane surfaces are 2.4 cm apart. The space between the surfaces is filled with glycerine (u = 8.1x10-¹N.s/m²). What force is required to drag a very thin plate of the surface area of 0.5 m² between two large plane surfaces at a speed of 0.6 m/s if: (a) The thin plate is in the middle of the two-plane surface. (b) The thin plane is at a distance of 0.8 cm from one the bottom surface.

Two large plane surfaces are 2.4 cm apart. The space between the surfaces is filled with glycerine (u = 8.1x10-¹N.s/m²). What force is required to drag a very thin plate of the surface area of 0.5 m² between two large plane surfaces at a speed of 0.6 m/s if: (a) The thin plate is in the middle of the two-plane surface. (b) The thin plane is at a distance of 0.8 cm from one the bottom surface.

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

See similar textbooks

Similar questions

Spaces h1=15 mm and h2=20 mm wide between upper and lower stationary plates and a very thin moving plate is filled with crude oil (oil =7.18x10-3 Pas) and water (water =1.00x10-3 Pas), respectively. What force is required to drag the plate of 0.5 m2 area between the surfaces at a speed of v=0.15 m/s. Assume linear velocity profile
The drag coefficient of a car at the design conditions of 1 atm, 70°F, and 60 mi/h is to be determined experimentally in a large wind tunnel in a full-scale test. The frontal area of the car is 22.26 ft2. If the force acting on the car in the flow direction is measured to be 68 lbf, determine the drag coefficient of this car.
Which car is more likely to be more fuel-efficient: one with sharp corners or one that is contoured to resemble an ellipse? Why?
Water at 10°C flows over a 1.1-m-long flat plate with a velocity of 0.55 m/s. If the width of the plate is 2.5 m, calculate the drag force acting on the top side of the plate. (Water properties at 10°C are: ? = 999.7 kg/m3, ? = 1.307 × 10−3 kg/m·s.) (a) 0.46 N (b) 0.81 N (c) 2.75 N (d ) 4.16 N (e) 6.32 N
2. A 0.10 cm-radius sphere falling in air (T= 20°C) at a speed of 25 m/s. Determine the following: a) Skin drag force b) Form drag force c) Total drag force. 3. The raindrops of around 3 mm diameter fallat 5 mis, while drizzle with droplets of 0.3 mm diameter falls at 1.5 m's. what is the terminal velocity of such raindrops and terminal velocity of the drizzle?
A liquid (? = 850 kg/?3; ? = 1.7 × 10−1 Pa ∙ s) flows tangentially past a flat plate. If the free stream velocity is 2 m/s Question 1: what is the velocity 5 m downstream from the leading edge of the plateand 15 mm away from the plate. Question 2: if that plate is 10 m long and 3 m wide. Determine the drag force on the plate when liquid flows over both sides of the plate. (just only answer Question 2)!!!
To reduce the drag coefficient and thus to improve the fuel efficiency, the frontal area of a car is to be reduced. Determine the amount of fuel and money saved per year as a result of reducing the frontal area from 20 to 13 ft2. Assume the car is driven 12,000 mi a year at an average speed of 55 mi/h. Take the density and price of gasoline to be 50 lbm/ft3 and $3.10/gal, respectively; the density of air to be 0.075 lbm/ft3, the heating value of gasoline to be 20,000 Btu/lbm; and the overall efficiency of the drive train to be 30 percent.
To reduce the drag coefficient and thus to improve the fuel efficiency, the frontal area of a car is to be reduced. Determine the amount of fuel and money saved per year as a result of reducing the frontal area from 17 to 14 ft2. Assume the car is driven 10,000 mi a year at an average speed of 55 mi/h. Take the density and price of gasoline to be 50 lbm/ft3 and $3.10/gal, respectively; the density of air to be 0.075 lbm/ft3; the heating value of gasoline to be 20,000 Btu/lbm; and the overall efficiency of the engine to be 30%.
To reduce the drag coefficient and thus to improve the fuel efficiency, the frontal area of a car is to be reduced. Determine the amount of fuel and money saved per year as a result of reducing the frontal area from 18 to 15 ft2. Assume the car is driven 12,000 mi a year at an average speed of 55 mi/h. Take the density and price of gasoline to be 50 lbm/ft3 and $3.10/gal, respectively; the density of air to be 0.075 lbm/ft3; the heating value of gasoline to be 20,000 Btu/lbm; and the overall efficiency of the engine to be 30 percent.
At highway speeds, about half of the power generated by the car’s engine is used to overcome aerodynamic drag, and thus the fuel consumption is nearly proportional to the drag force on a level road. Determine the percentage increase in fuel consumption of a car per unit time when a person who normally drives at 55 mi/h now starts driving at 75 mi/h.
The oil tanker has a smooth surface area of 4.7(1033) m2m2 in contact with the sea. The velocity of the ship is 2 m/sm/s. Suppose that L� = 350 mm . Take ρ� = 1030 kg/m3kg/m3 and μ� = 1.14(10−3−3) N⋅s/m2N⋅s/m2. ( Determine the friction drag on its hull. Express your answer to three significant figures and include the appropriate units. Determine the power required to overcome this force. Express your answer to three significant figures and include the appropriate units.
If a 20 hp fishing boat motor can pull a 1150 kg boat with passengers of total mass 120 kg at a constant velocity of 13 m/s, what is the drag force on the boat by the water?