Answered: 4. A flat plate is sliding at a…

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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Transcribed Image Text:7. A circular disc of 0.3m dia and weight 50 N is kept on an inclined surface with a slope of 45°. The space between the disc and the surface is 2 mm and is filled with oil INS of dynamics viscosity What force will be required to pull the disk up the m² inclined plane with a velocity of 0.5m/s. 6. If the equation of velocity profile over 2 plate is V= 2y3, in which V" is the velocity in m's and 'y' is the distance in 'm' . Determine shear stress at (i) y = 0 (ii) y = 75mm. Take u =8.35P. 8. Dynamic viscosity of oil used for lubrication between a shaft and a sleeve is 6 P. The shaft is of diameter 0.4 m and rotates at 190 rpm. Calculate the power lost in the bearing for a sleeve length of 0.09 m Thickness of oil is 1.5 mm. 9. Two large surfaces are 2.5 cm apart. This space is filled with glycerin of absolute viscosity 0.82 NS/m. Find what force is required to drag a plate of area 0.5m 4. A flat plate is sliding at a constant velocity of 5 mis on a large horizontal table. A thin layer of oil (of absolute viscosity = 0.40 N-s/m) separates the plate from the table. between the two surfaces at a speed of 0.6m/s. (i) When the plate is equidistant from the surfaces, (ii) when the plate is at Icm from one of the surfaces. Calculate the thickness of the oil film (mm) to limit the shear stress in the oil layer to I kPa,

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