PHY2048_11-09-09 - Chapter 14: Fluids Lecture 30 11/9/2009...

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Chapter 14: Fluids Lecture 30 11/9/2009
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Fluids Goals for this Lecture: Study the behavior of ±uids. Static ±uids: Pressure exerted by a static ±uid Methods of measuring pressure Pascal’s principle Archimedes’ principle, buoyancy Real versus ideal Fluids in motion: Fluids Equation of continuity Bernoulli’s equation
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What is a Fluid? A substance that can fow Gases (easy to compress) Liquids (di±²cult to compress) Solids ? (gel = toothpaste, glass)? Basic properties: Fluids take the ±orm o± their container. When shear stress is applied they fow. Fluids can only exert a ±orce perpendicular to their sur±ace The molecules in fuids are in constant random motion (Brownian motion). The ²eld o± physics that describes the fuid motion is called “Fluid Mechanics”
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Fluid Properties: Density Density (sometimes referred to as “mass density”) is the mass of a given material per unit volume. Unit: ! = ! m/ ! V = [kg]/[m 3 ] The density can be different at each point of the ±uid. An object is uniform (or homogenous) if the density is
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PHY2048_11-09-09 - Chapter 14: Fluids Lecture 30 11/9/2009...

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