EES 0836 Lecture Notes - Lecture 31: Thermal Energy, Thermal Conduction
3 Apr 2016
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You learn to pump at natural frequency of swing. Amplitude of swing builds up: tacoma narrows bridge. Eddies of wind shedding of top and bottom of bridge in alternating fashion. Heat conduction: a model for crystals/molecules, we can think of molecules as masses connected by springs, even neutral atoms attract when they are close, but repel when they get too close. Electrons see (and like/covet) the neighboring nucleus. But when the electrons start to overlap, repulsion takes over: try moving in with the neighbor you covet, the trough looks just like the spring potential. So the connection is spring-like: estimation: how fast do they wiggle, a 1 kg block of wood takes 1000 j to heat by 1 c. Just a restatement of heat capacity = 1000 j/kg/(cid:1)c. So from 0 to 300 k, it takes 300,000 j: if we assign some kinetic energy to each mass (atom), it must all add up to.
