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The thermodynamic free energy is the amount of work that a thermodynamic system can perform. The concept is useful in the thermodynamics of chemical or thermal processes in engineering and science. The free energy is the internal energy of a system minus the amount of energy that cannot be used to perform work. This unusable energy is given by the entropy of a system multiplied by the temperature of the system.
In this context, the term "free energy" is not well-defined, and should not be confused with thermodynamic free energy. Generally, it is used to refer to purported transformative technologies which have the potential to dramatically reduce personal energy costs with relatively little capital investment.
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The total energy of the universe consists of the energy due to the motion of all the particles (called kinetic energy), the energy that is stored because of the gravitational forces between the particles (called potential energy), and the energy associated with the mass of all the particles (usually referred to as rest energy).
The key feature to bear in mind is that the gravitational potential energy is a negative quantity. You can see this by realizing that in order to separate two objects, one has to overcome the attractive gravitational force and this requires one to supply positive energy from outside. This is why launching satellites into space requires such huge amounts of positive energy supplied by fuel, in order to overcome the negative gravitational potential energy of the satellite due to the Earth's attractive force.
Source
The second law is a bit more complex than the first law, but basically it says that any time you do work, including any time you make an energy transformation, some of the starting energy is going to be lost as heat. So when you drive a car some of the gasoline's energy is lost right a way as heat, some gets turned into mechanical energy to move the car. Even some of this mechanical energy is also lost as heat. For instance if you feel your car's tires at the end of a trip they will be hot from friction with the road. This heat is an energy loss and is a consequence of the second law.
Perpetual motion describes "motion that continues indefinitely without any external source of energy; impossible in practice because of friction."[2]
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Strictly speaking, planetary orbits are not perpetual motion. As the planet (and their star) rotate around their common center of gravity, they emit gravitational waves. Those gravitational waves drains the planet/star orbital system on energy so the planet eventually get's closer and closer to its star.
Now this orbital decay due to gravitational wave emission is ridicoulusly small so it has only been measured for extreme systems like binary neutron stars (which are heavy and may orbit each other within minutes, seconds or just a fraction of a second). Our planet Earth is subject to gravitational wave emission as well, but the orbital decay is so small that it in practice won't affect earth within the Suns lifetime, instead of Earth spiralling into and being devoured by our Sun, it will rather be our Sun (turning into a red giant) which extends beyond the current orbit of Earth and thus devours it.
So even by cosmological timescales, planetary motion around a star will go on for a long time, e.g for the lifetime of a sun-like star and beyond.
Landauer’s erasure principle has been considered controversial in physics ever since he proposed it in the early ’60s. Was it a new law of physics or just a consequence of some already existing laws? Our new paper argues that in quantum physics, you can, in fact, erase information and cool the environment at the same time. For many physicists, this is tantamount to saying that perpetual motion is possible!
Quantum physics seems to allow us to have a cake and eat it, in that it allows us to erase information and cool the environment too.
But this, luckily for the second law (though not for would-be inventors of perpetual motion machines), is not the case. Landauer’s insight is still fine, and erasing information adds entropy to the environment. What saves the second law is that, in quantum physics, entropy can actually be negative. Adding negative entropy is the same as taking entropy away.
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Machines which extract energy from seemingly perpetual sources—such as ocean currents—are capable of moving "perpetually" (for as long as that energy source itself endures), but they are not considered to be perpetual motion machines because they are consuming energy from an external source and are not isolated systems (in reality, no system can ever be a fully isolated system).
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Perpetual motion describes "motion that continues indefinitely without any external source of energy; impossible in practice because of friction."[2] It can also be described as "the motion of a hypothetical machine which, once activated, would run forever unless subject to an external force or to wear".[3] There is a scientific consensus that perpetual motion in an isolated system would violate the first and/or second law of thermodynamics.
The impossible kinds of perpetual motion machines are those from which you can extract usable energy and the system continues exactly the same way as it did before the energy was extracted, providing an infinite supply of energy. These certainly don't exist. But systems in which the components are constantly in motion and never slow down do in fact exist. The electrons in orbit around the nuclei of atoms are in effect little perpetual motion machines, at least in one construe of what those words mean, because they are perpetually in motion. But energy cannot be extracted from motion of such electrons if they are in the "ground state" (and most atoms are) because there are no lower-lying energy states allowed by quantum mechanics. If the electrons are not in the ground state, you can extract useful energy, but then the atoms go into lower energy states until they reach their ground state, from which no further energy can be extracted.
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Regarding electrons:
Well, even ignoring the fact that you can't
*see* an atom -- it isn't "macroscopic" by any stretch of the imagination
-- there is one small problem with "perpetual motion" in an atom that
emerges from the quantum-mechanical haze: specifically, if you consider an
atom with a single electron (that is, hydrogen), according to quantum
mechanics its ground state has no angular momentum associated with it. In
other words, the electron doesn't "go around" the nucleus -- indeed, there
is no definable or measurable "motion" at all.
I don't know if this answers your question, or if it just leaves you with
more issues than answers. I recommend that you look at any college physics
textbook, as a starting point. Look especialy at sections relating to Work
and Energy, Friction, the Laws of Thermodynamics and (if it is included)
models of the atom
www.madsci.org...
The picture you often see of electrons as small objects circling a nucleus in well defined "orbits" is actually quite wrong. As we now understand it, the electrons aren't really at any one place at any time at all. Instead they exist as a sort of cloud. The cloud can compress to a very small space briefly if you probe it in the right way, but before that it really acts like a spread-out cloud. For example, the electron in a hydrogen atom likes to occupy a spherical volume surrounding the proton. If you think of the proton as the size of a grain of salt, then the electron cloud would have about a ten foot radius. If you probe, you'll probably find the electron somewhere in that region.
van.physics.illinois.edu...edit on 29-10-2012 by boncho because: (no reason given)
Bodies in space moving via kinetic energy, will maintain motion until it preforms work. eg. Stopping. Some could argue that a rock floating through the vacuum of space is perpetually moving (so long as it never runs into something) which, for the most part is true, but eventually, it probably will and it won't be perpetual anymore.
Originally posted by ken10
reply to post by boncho
Bodies in space moving via kinetic energy, will maintain motion until it preforms work. eg. Stopping. Some could argue that a rock floating through the vacuum of space is perpetually moving (so long as it never runs into something) which, for the most part is true, but eventually, it probably will and it won't be perpetual anymore.
BUT.......If NOTHING in the universe is stationary, then perpetual motion must be the norm ?...........No.
And afaik there is no evidence for your "Probably"
First law: If an object experiences no net force, then its velocity is constant: the object is either at rest (if its velocity is zero), or it moves in a straight line with constant speed (if its velocity is nonzero).[2][3][4]
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Gravitation causes dispersed matter to coalesce, and coalesced matter to remain intact, thus accounting for the existence of the Earth, the Sun, and most of the macroscopic objects in the universe
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perpetual motion, the action of a device that, once set in motion, would continue in motion forever, with no additional energy required to maintain it. Such devices are impossible on grounds stated by the first and second laws of thermodynamics.
per·pet·u·al mo·tion
Noun:
A state in which movement or action is or appears to be continuous and unceasing.
Here is even more on that idea which involves superconductivity and not electron orbitals specifically:
Originally posted by boncho
I'm going to cross post more on the idea of electrons as considered to be 'perpetual motion'
In the deep void of space it might be pretty easy to keep the superconductor superconducting, but it's quite a task here on Earth. I think CERN's electric bill exceeds a million dollars a month and a lot of that power is used in refrigeration to keep the superconductors cold enough to superconduct.
Superconductor: An element, inter-metallic alloy, or compound that will conduct electricity without resistance below a certain temperature. However, this applies only to direct current (DC) electricity and to finite amounts of current. All known superconductors are solids. None are gases or liquids. And all require extreme cold to enter a superconductive state. Once set in motion, current will flow forever in a closed loop of superconducting material - making it the closest thing to perpetual motion in nature.
The Earth is already slowing down its rotation due to the tidal forces. If mankind utilized lots of energy from tides, will that cause the Earth's rotation to slow down even faster? The Earth is pretty big so we'd have to use a lot of energy, but it might be possible.
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This braking is caused by tidal friction. Throughout the earth's history tidal braking has played, and it will continue to play, a dominant role in the rotation. Currently the secular change in the rotation rate increases the length of day by some 2.3 milliseconds per day per century
Tidal movement causes a continual loss of mechanical energy in the Earth–Moon system due to pumping of water through the natural restrictions around coastlines, and due to viscous dissipation at the seabed and in turbulence. This loss of energy has caused the rotation of the Earth to slow in the 4.5 billion years since formation. During the last 620 million years the period of rotation has increased from 21.9 hours to the 24 hours we see now; in this period the Earth has lost 17% of its rotational energy. While tidal power may take additional energy from the system, increasing the rate of slowdown, the effect would be noticeable over millions of years only, thus being negligible.
The biggest draw back with tidal power is the impact on marine life, and the unreliable timing of tides. Similar to the problems associated with wind and solar. Sunny and windy days are needed...
I agree completely. I don't see how it can be called renewable, it's just a very massive persistent source that we think we can only drain slowly.
Originally posted by boncho
The only thing I didn't agree with in the second article is that they classify tidal force as a renewable energy source. Most other sites don't classify it as such given that once rotation is gone... It's gone.
To ensure success of your argument you have had to resort to YOUR insistence that perpetual motion machines must last for infinity.
When faced with the fact that electron movement can be viewed as perpetual motion you resort to moving the goal posts. So I have to believe you as opposed to what has been taught for almost a generation. What, are all those teachers from high school through university lying to all their students when they say electrons rotate around the nuclease. One electron in your example becomes a cloud. What, did it break up into little bits!
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The Bohr model is a relatively primitive model of the hydrogen atom, compared to the valence shell atom. As a theory, it can be derived as a first-order approximation of the hydrogen atom using the broader and much more accurate quantum mechanics, and thus may be considered to be an obsolete scientific theory. However, because of its simplicity, and its correct results for selected systems (see below for application), the Bohr model is still commonly taught to introduce students to quantum mechanics, before moving on to the more accurate, but more complex, valence shell atom
On to the solar system! Eventually it will all slow down! Therefore it is not perpetual motion. Prove it! Name just one planet that has done it. In all the cosmos, name just one!
If your arguments have to be this shaky then I don't have much faith in what you are saying.
Right now, today, we could have a green, cheap energy system with world wide coverage. But we won't get it. because THERE IS NOT ENOUGH PROFIT!
Consider, solar panels - create electricity - separate H2 and O - Store the hydrogen - use the hydrogen in fuel cell engines where the hydrogen recombines with O2 to form water. No pollution, sustainable.
Both solar panels, and equipment for extracting and refining oil, need energy output to create them.
If solar power is "free energy" so to is gasoline...
Originally posted by flexy123
Haven't read the entire (interesting) thread yet..but
Both solar panels, and equipment for extracting and refining oil, need energy output to create them.
If solar power is "free energy" so to is gasoline...
is of course correct, but the big difference is that gasoline is made from non-renewable sources which will soon be depleted (oil, coal etc...)..while we don't have to worry about the Sun's energy output for some millions of years.
Why would I want to use batteries? The energy out of the solar panels is stored in the hydrogen. If you want to look at efficiency look at the efficiency of getting fuel ready for your engine. Now that is an inefficient system, but hell yea, there are great profits to be made.