Comments on: Please explain Law of Conservation of Energy? http://www.energy--talk.com/alternative-energy/please-explain-law-of-conservation-of-energy/165/ How Can We Be More Energy Efficient? Wed, 08 Feb 2012 14:58:05 +0000 http://wordpress.org/?v=2.6.5 By: remember.kelly http://www.energy--talk.com/alternative-energy/please-explain-law-of-conservation-of-energy/165/#comment-296 remember.kelly Thu, 01 Nov 2007 17:40:57 +0000 http://www.energy--talk.com/alternative-energy/please-explain-law-of-conservation-of-energy/165/#comment-296 From the wording of your question I gather that the source of the confusion is that you assume that all energy is useful, which is not the case. The energy in a spinning top is kinetic energy, which is useful, so is the potential energy of a weight laying on a table. But the energy of molecular motion - heat- is useful only if it is concentrated, meaning, available at high temperature. When the top stops spinning its energy has dissipated to heat energy. Not to useful heat energy that can ignite a match, but to useless heat that has spread out in a heat sink at low temperature. The total amount of energy is the same - it's conserved- but useful energy has been converted to useless energy. That's another law, the second law of thermodynamics. ******************************* Will the slug brain who keeps giving the thumbs-down please identify yourself? If you have an opinion, why don't you express it openly? Better yet, do an honest calculation now and then to prove your point, although I doubt you know anything worth teaching anyone. From the wording of your question I gather that the source of the confusion is that you assume that all energy is useful, which is not the case. The energy in a spinning top is kinetic energy, which is useful, so is the potential energy of a weight laying on a table. But the energy of molecular motion - heat- is useful only if it is concentrated, meaning, available at high temperature. When the top stops spinning its energy has dissipated to heat energy. Not to useful heat energy that can ignite a match, but to useless heat that has spread out in a heat sink at low temperature. The total amount of energy is the same - it’s conserved- but useful energy has been converted to useless energy. That’s another law, the second law of thermodynamics.

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Will the slug brain who keeps giving the thumbs-down please identify yourself? If you have an opinion, why don’t you express it openly? Better yet, do an honest calculation now and then to prove your point, although I doubt you know anything worth teaching anyone.

]]> By: rijim2001 http://www.energy--talk.com/alternative-energy/please-explain-law-of-conservation-of-energy/165/#comment-295 rijim2001 Thu, 01 Nov 2007 00:17:39 +0000 http://www.energy--talk.com/alternative-energy/please-explain-law-of-conservation-of-energy/165/#comment-295 The energy is dissipated into the environment as wasted heat never to be recovered again. This causes the ENTROPY (a measure of the disorder of a system) of the universe to increase. According to the 2nd Law of Thermodynamics, the entropy of the universe will always increase. Since entropy gives information about the evolution of an isolated system with time, it is said to give us the direction of time's arrow . If snapshots of a system at two different times shows one state which is more disordered, then it could be implied that this state came later in time. For an isolated system, the natural course of events takes the system to a more disordered (higher entropy) state The energy is dissipated into the environment as wasted heat never to be recovered again. This causes the ENTROPY (a measure of the disorder of a system) of the universe to increase. According to the 2nd Law of Thermodynamics, the entropy of the universe will always increase.
Since entropy gives information about the evolution of an isolated system with time, it is said to give us the direction of time’s arrow . If snapshots of a system at two different times shows one state which is more disordered, then it could be implied that this state came later in time. For an isolated system, the natural course of events takes the system to a more disordered (higher entropy) state

]]> By: (Ω)Mistress Bekki http://www.energy--talk.com/alternative-energy/please-explain-law-of-conservation-of-energy/165/#comment-294 (Ω)Mistress Bekki Tue, 30 Oct 2007 06:49:57 +0000 http://www.energy--talk.com/alternative-energy/please-explain-law-of-conservation-of-energy/165/#comment-294 For the ground to cool, something else had to absorb the heat. Ultimately all of the heat we create is radiated back into deep space. For the ground to cool, something else had to absorb the heat.

Ultimately all of the heat we create is radiated back into deep space.

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