The space between two square flat parallel plates is filled with oil. Each side of the plate is 0.8 m. The specific weight of the oil is 9620 N/m3. The thickness of the oil film is 14.9 mm and requires a force of 175 N. The liquid having the kinematic viscosity of 15 stokes. Determine (i) the shear stress (ii) the density of oil (iii) the dynamic viscosity in poise and (iv) the moving velocity of the upper plate.

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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.