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Questions and Answers
What is the primary focus of fluid mechanics?
What is the primary focus of fluid mechanics?
- The classification of fluid types based on color
- The behavior of fluids at absolute zero
- The study of solid materials under stress
- The relationships between forces and motions in fluids (correct)
Which characteristic defines a substance as a fluid?
Which characteristic defines a substance as a fluid?
- It has a definite shape and volume
- It has a high shear modulus
- It can resist shear forces applied to it
- It undergoes continuous deformation (correct)
What is a feature of steady fluids?
What is a feature of steady fluids?
- Their density changes constantly
- Their density remains constant at every point (correct)
- Their velocity varies between points
- They cannot be compressible
How are compressible fluids classified?
How are compressible fluids classified?
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Which of the following is NOT a classification of fluids based on flow?
Which of the following is NOT a classification of fluids based on flow?
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What distinguishes unsteady fluids from steady fluids?
What distinguishes unsteady fluids from steady fluids?
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Which statement about fluids is accurate?
Which statement about fluids is accurate?
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Study Notes
Fluid Mechanics Overview
- Studies fluids in both static and dynamic situations.
- A branch of continuous mechanics involving forces, motions, and statics in continuous materials.
Definition of Fluid
- Fluids continuously deform and flow when subjected to external pressure.
- Lack a definite shape and cannot withstand shear forces at rest.
- Possess zero shear modulus, meaning they yield to applied shear forces.
Classification of Fluids by Flow
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Steady vs. Unsteady
- Steady fluids maintain constant density at all points while flowing.
- Unsteady fluids exhibit varying velocities between points during flow.
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Compressible vs. Incompressible
- Classification based on Mach number, a dimensionless ratio of flow velocity to the speed of sound in the fluid.
- Incompressible fluids typically have a Mach number less than 0.3, allowing density to remain constant with changes in pressure.
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Viscous vs. Non-viscous
- Viscous fluids exhibit resistance to flow due to internal friction.
- Non-viscous fluids lack internal friction and flow freely.
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Rotational vs. Irrotational
- Rotational fluids involve rotation of fluid particles around their axis.
- Irrotational fluids have no net rotation of fluid particles, simplifying analysis.
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