Chp4_TwoBlocProb

Chp4_TwoBlocProb - The "two-block entropy...

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The “two-block entropy problem” In class, we used the fact that two blocks at different temperatures will come to thermal equilibrium by means of an energy exchange in the form of heat whose direction is always (spontaneously) from the warm block to the cold block with equilibrium being reached when the two blocks come to a common temperature. We asserted that this unfailing direction of nature was consistent with the Second Law of Thermodynamics S univ ≥ 0. Let us consider the case a bit further where, for simplicity, we assume the two blocks are of the same material and size, differing only by their initial temperatures. Let T h be the initial temperature of the high T block (“hot”) and T c be the temperature of the low T block (the “cold” one). Now, in class we made the claim that: S c = q c /T c and S h = q h /T h and thus to make S univ ≥ 0 we needed the positive signed value of q (the block into which the energy flowed) to be the cold block. To illustrate, suppose T
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This note was uploaded on 03/30/2008 for the course CH 201 taught by Professor Warren during the Fall '07 term at N.C. State.

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Chp4_TwoBlocProb - The "two-block entropy...

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