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lecture 8 - stokes

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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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Work done by an expanding gas 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?
How much work did the gas do as it expanded?

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Thought question (ungraded) A gas in a piston expands from point A to point B on the P-V plot, via  either path 1 or path 2.  Path 2 is a

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