In an experiment similar to the Joule experiment (Fig. 1.1), an electric motor is used instead of

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In an experiment similar to the Joule experiment (Fig. 1.1), an electric motor is used instead of a weight to stir the liquid. The thermal power PQ, assumed to result from the friction, is known. The coefficient cM, which represents the heat per unit mass and temperature, is known and it is assumed to be independent of temperature.


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a) Deduce the temperature rise ΔT after stirring for a time Δt.


b) Find an expression for the entropy variation ΔS during this process, which started at temperature T0image

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Principles Of Thermodynamics

ISBN: 9781108426091

1st Edition

Authors: Jean-Philippe Ansermet, Sylvain D. Brechet

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