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##### Thermodynamics in rotating systems - analysis of selected examples

**Authors**: J. Güémez, M. Fiolhais

**Ref.**: European Journal of Physics **35**, 015013_1-14 (2014)

**Abstract**: We solve a set of selected exercises on rotational motion requiring a mechanical and thermodynamical analysis. When non-conservative forces or thermal effects are present, a complete study must use the first law of thermodynamics together with the Newtons second law. The latter is here better expressed in terms of an angular impulse-momentum equation (Poinsot-Euler equation), or, equivalently, in terms of a rotational pseudo-work-energy equation. Thermodynamical aspects in rotational systems, when e.g. frictional forces are present or when there is a variation of the rotational kinetic energy due to internal sources of energy, are discussed.