5. The velocity profile for a thin film of a Newtonian fluid that is confined between a plate and a fixed surface is defined by μ = (10y - 0.25y2) mm/s, where y is in mm. Determine the shear stress that the fluid exerts on the plate and on the fixed surface. Take μ = 0.532 N-s/m².

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Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.