Two plates are placed 1.5 cm apart horizontally and filled the gap between them with an oil of viscosity 1.5 N-s/m2. What is the shear stress in oil if the upper plate is moved with a velocity of 3 m/s? 

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DDA JE Civil 29 Mar 2023 Shift 3 Official Paper
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  1. 300 N/m2
  2. 315 N/m2
  3. 250 N/m2
  4. 275 N/m2

Answer (Detailed Solution Below)

Option 1 : 300 N/m2
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Detailed Solution

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Concept:

where: μ = Dynamic viscosity, τ = Shear stress, V = velocity of plate, y = distance between the plates.

Calculation:

Given:

Thickness = t = 1.5 cm = 0.015 m, μ = 1.5 Δ V = 3 m/s

     

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