Physics122C_L03 - Physics 122C Fluid & Thermal Physics...

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Physics 122C Fluid & Thermal Physics Electricity & Magnetism John G. Cramer Professor of Physics B451 PAB cramer@phys.washington.edu Lecture 3 Temperature & Heat January 11, 2008, (26 Slides)
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Announcements Lecture Homework #1 has been posted on the Tycho system and is due at 11:59 PM on Wednesday, January 16. If you have not already done so, register your clicker, using the link on the 122C Syllabus page.
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January 9, 2008 Physics 122C - Lecture 2 3 Week Date L# Lecture Topic Pages Slides Reading Assignment HW Due Tutorial Lab 1 07-Jan-08 1 Static Fluids 17 9+14 13-1 to 13-3 No Tutorials 1st Week No Labs 1st week 09-Jan-08 2 Moving Fluids: Bernoulli 11 30 13-4 11-Jan-08 3 Venturi; Temperature & Heat 12 26 17-1 to 17-3 2 14-Jan-08 4 28 17-4 Pressure Buoyancy (118) 16-Jan-08 5 18 18-1 to 18-2 HW1 18-Jan-08 6 21 18-3 to 18-6, 18-9 3 21-Jan-08 H1 M. L. King Birthday HOLIDAY Ideal Gas Law Heat Capacity (118) 23-Jan-08 7 Gas Cycles & Heat Engines 22 26 19-1 to 19-4 HW2 25-Jan-08 E1 EXAMINATION 1 - Chapters 4 28-Jan-08 8 Carnot & Entropy 19 19 19-5 to 19-7 1st Law of Thermo Ideal Gas Law (118) 30-Jan-08 9 Charge & Coulomb's Law 21-1 to 21-3 HW3 01-Feb-08 10 Electric Field Discrete Charges 21-4 to 21-5 Lecture Schedule (Part 1) We are here!
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January 9, 2008 Physics 122C - Lecture 2 4 Giovanni Battista Venturi (1746 - 1822) The Venturi Effect 1 2 For horizontal flow, h h = 1 2 2 constant P v ρ + = Venturi Effect : As air (or another fluid) passes through a constriction, its speed increases and its pressure drops. Streamlines: lines indicate the laminar flow path, size of the separation between streamlines indicates pressure and/or inverse speed squared.
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January 9, 2008 Physics 122C - Lecture 2 5 Venturi Applied The wing on a Formula 1 racecar deflects air upward, increasing downward force on wheels for better control. Underbody venturi effect drops the pressure under the car, pulling it toward the ground. When atomizer bulb is squeezed, airflow through the constriction drops pressure, pulling liquid from the jar into the airstream, to emerge as a spray from nozzle.
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January 9, 2008 Physics 122C - Lecture 2 6 Example : A Venturi Meter A “venturi meter” measures the flow rate of an incompressible inviscid fluid. Fluid of density ρ F passes through a pipe of cross sectional area A 1 that has a constriction of area A 2 , creating a pressure drop between the two regions. A U-tube manometer filled with liquid of density ρ L develops a height difference h , providing a measure of the flow rate v 1 .
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This note was uploaded on 04/05/2008 for the course PHYS 122 taught by Professor Cramer during the Winter '08 term at University of Washington.

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Physics122C_L03 - Physics 122C Fluid & Thermal Physics...

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