There is a 1 mm thick layer of oil between a flat plate of area 10–2 m2 and a big plate. How much force is required to move the plate with a velocity of 1.5 cm/s ? The coefficient of viscosity of oil is 1 poise -

Engineering

Physics

SI Units

Acceleration

Viscosity and Terminal Velocity New

Question

There is a 1 mm thick layer of oil between a flat plate of area 10^–2 m² and a big plate. How much force is required to move the plate with a velocity of 1.5 cm/s ? The coefficient of viscosity of oil is 1 poise -

1.3 × 10^–5 N

1.5 × 10^–2 N

1.5 × 10^–3 N

1.5 × 10² N

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$F = ηA \frac{v}{y} = \frac{10^{- 1} \times 10^{- 2} \times 1 .5 \times 10^{- 2}}{10^{- 3}} = 1 .5 \times 10^{- 2} N$