333333333 - PY211 Lecture 20(15 Nov 2016 Fluids[Ch 12 Young...

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PY211 Lecture 20 (15 Nov 2016) Fluids [Ch. 12 Young and Freedman (cont.)]
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Class info Midterm 2: scores posted on Blackboard – Please submit regrade requests by end of the week Problem Set 9: due Friday, Nov. 18 by 5pm. To be posted. Problems from Chapters 12, 13. Ten problems online. Half also submitted on paper Discussion this week: on topics from Chs. 13, 14. Lab: this week in SCI-B9 Lab6: Fluids Help: SCI-121 More help: on Piazza!
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Gases vs. Liquids Pressure in liquids and gases are due to a combination of gravitational and thermal contributions: For gases, the gravitational contribution is minimal.
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Pressure in a Static Liquid If point 2 is a vertical distance h below point 1, and the pressure at point 1 is P 1 , the pressure at point 2 is: Note: Point 2 does not have to be directly below point 1. Ex: diving For liquids, however, gravity plays a big role. P 2 = P 1 + ρ gh P 2 = 10 5 Pa + 1000 kg m 3 ( ) 10 m s 2 ( ) h
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Pressure in a Static Liquid For a liquid in hydrostatic equilibrium, the pressure depends only on the depth and the surface pressure. A connected liquid in hydrostatic equilibrium rises to the same height in all open regions of the container. Compare the pressures at the bottom of each tube. Is there a pressure difference?
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Pressure in a Static Liquid Consider two connected tubes of different shape. Is the pressure at point 1 greater than at point 2? Pressure is the same at all points on a horizontal line through a connected liquid in hydrostatic equilibrium. The two points are at the same depth, so the pressures are equal. Otherwise, fluid would flow.
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Worksheet What is the longest vertical soda straw you could possibly drink from? By sucking on the top and reducing the pressure, the straw is essentially a barometer. Atmospheric pressure pushes the liquid up the straw. The length of the longest straw can be obtained from the formula
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