A 7.5 cm radius vertical cylinder rotates concentrically inside another cylinder of radius 7.55 cm. Both cylinders are 25 cm high. The space between the cylinders is filled with liquid whose viscosity is unknown. If a torque of 12.0 N is required to rotate the inner cylinder at 110 rpm, determine the viscosity of the fluid.

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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.