A fluid is defined as a substance that ____________________?
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Answer: C. Can not remain at rest under the action of any shear force
Explanation
A fluid cannot sustain shear stress when at rest, meaning it will continuously deform under any applied shear force. Unlike elastic solids that resist deformation, fluids flow and change shape permanently when subjected to shear. Static equilibrium in a fluid is impossible if any net shear stress is present within the substance. Fluids encompass both liquids and gases that share the fundamental property of continuous deformation under shear. Viscosity dictates how rapidly a fluid deforms when subjected to a specific magnitude of shear stress. Pascal's law and hydrostatic pressure principles apply to fluids at rest because shear stresses vanish entirely.
Fluid mechanics principles are essential for designing pipelines, hydraulic machinery, and aerodynamics applications. Understanding fluid shear behavior helps engineers calculate drag forces acting on submerged objects. Lubrication engineering relies on fluid shear characteristics to minimize friction between moving mechanical parts. Expanding to fill any container is a characteristic specific to gases rather than incompressible liquids. Being partially incompressible describes certain liquids but fails to define gaseous fluids accurately. Stating a fluid cannot be subjected to shear force is incorrect because fluids experience shear when flowing.
- Subject
- Agriculture
- Category
- Agriculture
- Topic
- —
- Difficulty
- medium
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