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-sim') separates the plate from the table. Calculate the thickness of the oil film (mm) to limit the shear stress in the oil layer to I kPa.
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-sim') separates the plate from the table. Calculate the thickness of the oil film (mm) to limit the shear stress in the oil layer to I kPa.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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![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,](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3875e521-0b4b-42d7-95c6-c1e6efe4bd53%2F738a303c-2627-4f3a-8538-cf797b50b5bb%2Frhyqr57_processed.jpeg&w=3840&q=75)
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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