4. For a parallel plate arrangement of the type shown in Figure Q4, it is found that when the distance between plates is 2 mm, a shearing stress of 150 Pa develops at the upper plate when it is pulled at a velocity of 1 m/s. Assume the velocity distribution is linear between the plates, Determine: (i) the dynamic viscosity of the fluid between the plates. (2 marks) (a)0.3 N-S/m² (b) 3.3 N-S/m² (c) 0.3 kg 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.