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A flat plate of area 10cm^{2} is separated from a large plate

Question

A flat plate of area 10cm $^{2}$ is separated from a large plate by a layer of glycerine $1 mm$ thick.If the coefficient of viscosity of glycerine is 20 poise, the force required to keep the plate moving with a velocity of $1 c m$ per sec is :

80 dyne

200 dyne

800 dyne

2000 dyne

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James Discussed

A flat plate of area 10cm

^{2}

is separated from a large plate by a layer of glycerine

1 mm

thick.If the coefficient of viscosity of glycerine is 20 poise, the force required to keep the plate moving with a velocity of

1 c m

per sec is :

11 mins ago

Discuss this question LIVE

11 mins ago

Text solutionVerified

Force required =

η A \frac{d v}{d y}

Now,

\frac{d v}{d y} = \frac{10 \times 1 c m / s}{1 c m} = 10/ s

So, force to keep plate moving =

10 \times 10 \times 20

dyne =

2000

dyne

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Question Text	A flat plate of area 10cm $^{2}$ is separated from a large plate by a layer of glycerine $1 mm$ thick.If the coefficient of viscosity of glycerine is 20 poise, the force required to keep the plate moving with a velocity of $1 c m$ per sec is :
Answer Type	Text solution:1
Upvotes	150