ch19-p046 - 46 Two formulas(other than the first law of...

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33 3 diag int diag ( 5.0 10 7.0 10 ) J 2.0 10 J. QE W + = − × + × = × (c) The fact that Δ E int only depends on the initial and final states, and not on the details of the “path” between them, means we can write 3 int int int 5.0 10 J ca EE E Δ= = × for the indirect path, too. In this case, the work done consists of that done during the constant pressure part (the horizontal line in the graph) plus that done during the constant volume part (the vertical line): () ( ) 4 indirect 5.0 10 Pa 2.0m 0 1.0 10 J. W + = × Now, the first law of thermodynamics leads to 34 3 indirect int indirect ( 5.0 10 1.0 10 ) J 5.0 10 J. W + × + × = × 46. Two formulas (other than the first law of thermodynamics) will be of use to us. It is straightforward to show, from Eq. 19-11, that for any process that is depicted as a straight line on the pV diagram — the work is straight 2 if pp WV + §· ¨¸ ©¹ which includes, as special cases, W = p Δ V for constant-pressure processes and
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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