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Fluid in Motion

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Ideal Fluid Ideal fluid is incompressible

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Ideal Fluid Ideal fluid has no viscosity

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Ideal Fluid Ideal fluid has a laminar (nonturbulent) flow

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Continuity of Flow

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As the air passes across the tube of perfume, the air pressure above it becomes lower, and the fluid (perfume) is pushed up the tube

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Flying

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Atmospheric pressure Carburetor

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**Bernoulli’s Principle**

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Bernoulli’s Equation

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**To “lift water up” work is done**

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**To “lift water up” work is done**

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**Net work is done by the net force:**

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**Net work is done by the net force:**

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**Conservation of Total Energy (there are NC forces present)**

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A Venturi meter is a device that is used for measuring the speed of a fluid within a pipe. The drawing shows a gas flowing at speed v2 through a horizontal section of pipe whose cross-sectional area is A2 = m2. The gas has a density of 1.30 kg/m3. The Venturi meter has a cross-sectional area of A1 = m2 and has been substituted for a section of the larger pipe. The pressure difference between the two sections is P2 - P1 = 120 Pa. Find (a) the speed v2 of the gas in the larger, original pipe and (b) the volume flow rate Q of the gas.

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