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Question

Oil (μ=0.44 Pas,r=888kg/m3) is filled in the space between two parallel plates which are 18 mm apart. The upper plate is moving at a velocity of 4 m/s. What is the shear stress on the plate?

A
97.8 Pa
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B
48.9 Pa
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C
79.8 Pa
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D
87.9 Pa
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Solution

The correct option is A 97.8 Pa
Shear stress, τ=μdudy=0.44×40.018
=97.8 Pa

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