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Q.

Which of the following are true

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a

poiseuille's equation is valid for steady and laminar flow

b

viscous drag force always opposite to relative motive

c

Hotter liquids flows faster than cold liquids

d

viscous  force acts between the layers, even if there is no relative motion

answer is Û.

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Detailed Solution

Poiseuille's equation V=πPr48ηl is valid for steady and laminar fluid in a horizontal pipeViscous force is fluid friction which opposes relative motion between two fluid surfacesHotter fluids travel faster than colder fluids as viscosity decrease( cohesive forces between molecules decrease)
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