Answered: Figure 1 shows a layer of oil(8.95…

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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Figure 1 shows a layer of oil(8.95 kN/m^3), the thickness of 0,3mm, between two parallel plates, the upper plate is pulled across the bottom plate with a cable connected to winch. The upper plate moves with a velocity 0.05m/s. The area contact between the upper plate and the oil is 1.5m^2. Determine the kinematic viscosity of the oil if the torque acting winch drum should not exceed 24.5 ×10^-3 Nm. Take the drum diameter as 50mm.

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Page |2
QUESTION 1
Figure 1 shows a layer of oil (8.95 kN/m³), the thickness of 0.3 mm, between two parallel [8]
flat plates. The upper plate is pulled across the bottom plate with a cable connected to
a winch. The upper plate moves with a velocity of 0.05 m/s. The area of contact between
the upper plate and the oil is 1.5 m². Determine the kinematic viscosity of the oil if the
torque acting on the winch drum should not exceed 24.5 x 10³ Nm. Take the drum
diameter as 50 mm.
Figure 1
Winch.
Pulley.
0.3 mm
QUESTION 2
Figure 2 shows a 2 m width gate ABC. To maintain this location, what would be the F. [18]
Figure 2
450
SG = 0,86
50 cm
A
Hinge
10 cm
SG = 1.23
80 cm
F
40 cm
Page |3
QUESTION 3
Find h when the pressure in tank B is 21 kPa.
[9]

QUESTION 2
Figure 2 shows a 2 m width gate ABC. To maintain this location, what would be the F. [18]
Figure 2
45°
SG = 0.86
50 cm
Hinge
t 10 cm
SG = 1.23
80 cm
C
B
40 cm
Page |3
QUESTION 3
Find h when the pressure in tank B is 21 kPa.
[9]
A
Air
Air
SG = 0.91
Oil
C
1 m
B
2 m
Water
1.25 m
1.25 m
Water
1.5 m
t0.5 m
Figure 3

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