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TP048-1: Elastic Thermal System — Why Stretching Can Heat a Rod

This JC mini lecture explains how a stretched plastic rod can be treated as a thermodynamic system. Starting from the elastic force law, we use the Helmholtz free energy and a Maxwell relation to reconstruct the entropy of the rod. The result shows that stretching lowers entropy at fixed temperature, so an insulated quasistatic stretch makes the rod warm up.
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#TP048 #ThermalPhysics #StatisticalPhysics #Physics #PhysicsMajor #mathmajor #ElasticThermalSystem #ThermoelasticEffect #ThermoelasticHeating #ElasticRod #PlasticRod #Stretching #Entropy #EntropyReconstruction #HelmholtzFreeEnergy #LegendreTransform #MaxwellRelation #HeatCapacity #ConstantLengthHeatCapacity #TensionForce #MechanicalCoordinate #AdiabaticProcess #QuasistaticProcess #ReversibleAdiabatic #InsulatedStretching #TemperatureChange #ThermodynamicsBeyondGases #PhysicsMiniLecture #JCPhysicsMath

Видео TP048-1: Elastic Thermal System — Why Stretching Can Heat a Rod канала JC-PhysicsMath
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13 мая 2026 г. 4:00:13
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JC-PhysicsMath
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