A square metal plate 1.8 m side and 1.8 mm thick weighing 60 N is to be lifted through a vertical gap of 30 mm of infinite extent (Fig. (1)). The oil in the gap has a specific gravity of 0.95 and viscosity of 3 N.s/m². If the metal plate is to be lifted at a constant speed of 0.12 m/s, find the force required.

A square metal plate 1.8 m side and 1.8 mm thick weighing 60 N is to be lifted through a vertical gap of 30 mm of infinite extent (Fig. (1)). The oil in the gap has a specific gravity of 0.95 and viscosity of 3 N.s/m². If the metal plate is to be lifted at a constant speed of 0.12 m/s, find the force required.

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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Concept explainers

Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.

Question

A square metal plate 1.8 m side and 1.8 mm thick weighing 60 N is to be lifted through a
vertical gap of 30 mm of infinite extent (Fig. (1)). The oil in the gap has a specific gravity of
0.95 and viscosity of 3 N.s/m². If the metal plate is to be lifted at a constant speed of 0.12
m/s, find the force required.
Oil
1.8 mm.
30 mm
W = 60 N
Fig. 1

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