lecture 8 - first law

lecture 8 - first law - Announcements1/24/11 Prayer...

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Announcements 1/24/11 Prayer Substitute today: Dr. Stokes Today’s topics: a. PV diagrams b. Work c. Isothermal contours d. Internal energy e. First Law of Thermodynamics f. Some specific state changes
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Reading quiz (graded) Which of the following is NOT  true of the work  done on a gas as it goes from one point on a  PV diagram to another? a. It cannot be calculated without knowing  n   and  T . b. It depends on the path taken. c. It equals minus the integral under the curve. d. It has units of Joules. e. It is one of the terms in the First Law of  Thermodynamics.
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1 m 3  of an ideal gas at 300 K  supports a weight in a piston such  that the pressure in the gas is  200,000 Pa (about 2 atm). The gas  is heated up. It expands to 3 m 3 Plot the change on a graph of  pressure vs. volume (a P-V diagram) How much work did the gas do as it  expanded? a.
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lecture 8 - first law - Announcements1/24/11 Prayer...

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