1. Write down the definitions for pressure, force, moment, momentum, and stress. Also fully discuss the relation of pressure and shear stress such as their dimensions, directions, vector or scalar, and their usages in fluid dynamics. (20%)

3. First write down the definition for Reynolds number, explain its physical meaning in details. Also explain its relation to laminar flow, turbulent flow, and flow transition. Why flow could never change from turbulent to laminar, and always change from laminar to turbulent? Explain reasons in details. (20%)

1. Write down the definitions for pressure, force, moment, momentum, and stress. Also fully discuss the relation of pressure and shear stress such as their dimensions, directions, vector or scalar, and their usages in fluid dynamics. (20%)

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