Athin flat plate of surface area, 500 cm², is located between two fixed plates such that the gap below the top plate is 20 mm and the gap above the bottom plate is 30 mm. the gap between the fixed plates contain sae 30 oil at 15.6°c. determine the force needed to push the middle plate at a velocity of 1.0 m/s.

0.3166N

Explanation:

Given data

Area

Gap below top plate

Gap above bottom plate

SAE 30 oil viscosity =

Velocity of middle plate

There will viscous force on middle plate i.e. at above surface and below surface

Viscous force

this is force by oil on plate thus we need to apply atleast 0.3166N to move plate

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