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L11_28Jan_posted - Physics 6B Thermodynamics and Heat...

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-------------------------------- 1 Physics 6B Thermodynamics and Heat Engines -------------------------------- 2 Newcomen Engine http://videos.howstuffworks.com/discovery/34868-massive-engines- newcomen-steam-engine-video.htm http://videos.howstuffworks.com/discovery/34867-massive-engines- newcomen-engine-in-action-video.htm -------------------------------- 3 Housekeeping If you gave me a DRC form, please confirm via e-mail what you’ll need for midterm. Practice Exam (from Spring 2009) posted ! I’m aiming to have solutions posted early next week Review session for midterm: Sunday 2/6, 7-9pm, Classroom Unit 2 -------------------------------- 4 First Law of Thermodynamics Energy conservation Q: add heat to the system (add energy) –W: let the system do work (use energy) ! U: “leftover” energy remains in system, changing its temperature ! U = Q – W change in internal energy of system (net) work done BY system (net) heat added TO system Model system -- gas in a cylinder. Fixed amount of gas, movable piston, gas can be heated
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-------------------------------- 5 Isobaric (constant pressure) ! horizontal line on p,V diagram » A " B Constant-volume (“isochoric”) ! vertical line on p,V diagram » A " C Isothermal (constant temperature) !
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