L sreleasing energy take e out to slow down molecules

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L S:releasing energy •take E out to slow down molecules & stick them together, more mass=more E •↑temp U of obj, heat flow into obj. do work on obj. (↑U) •cold: arteries dilate transfer blood, hot: arteries constrict •melting:pull apart molecules&give enough E to break bonds •thermal convection:transfer of thermal E in fluids, movement of fluids (currents) •S L:molecules are closer-don’t need as much energy warmer air becomes less dense and moves upward, cold air is more dense L G:molecules spread out-need more energy •natural con.: motion due to local buoyancy diff. by presence of hot/cold body surface •↑surface area ↑heat flow ↑ electrons ↑ energy emitted •forced con.:motion of fluid imposed externally (pump/fan) •better conductor=(thermal conductivity )heat is readily conducted away •jiggling motion of e- cause atoms&molec. to emit electromagnetic waves Electrical Potential Energy Electrical Charge •(big electric charge=big electric field) •Mass moves along the field line, PE↓, KE↑ as particle accelerates •Atoms mostly empty space, remove proton from nucleus requires a lot of work •Energy moves from high to low (low to high requires work) •newton’s 3 rd law: electrons&protons are equal in magnitude but opposite in sign •Lose PE because there’s an attractive force •force will be smaller when the distance b/t the two objects get larger
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