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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)