Air flows through a circular duct. If the velocity of air is given as function r (distance from center of cross- section to the position) as : u = 10 * (1 – r/(0.05)) where u is in m/s and r is in m. What is the average velocity of the flow if the diameter of the duct is 10 cm.

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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.