otseng wrote: ↑Mon Jul 08, 2024 5:57 amDifflugia wrote: ↑Thu Jun 20, 2024 10:06 am
First, work doesn't consume energy.
Yes, energy can be transformed into work.
This is you not understanding thermodynamics.
What gets called "work" is the conversion of one type of energy into another. The work itself doesn't somehow consume the energy. If you have a frictionless spring with a weight on the end and I add energy by pulling the weight and stretching the spring, the energy that is converted to potential energy in the spring is exactly the amount that was removed from me. "Work" isn't a form of energy, so all of the energy added to the spring is potential energy.
Releasing the spring causes the potential energy to be transformed into kinetic energy of the spring. Work is done, but the amount of kinetic energy exactly matches the initial potential energy.
The kinetic energy is then converted to gravitational potential energy. At the point that the weight reaches its highest point, all of the kinetic energy has been converted to potential energy. Work was done, but the amount of total energy hasn't changed.
The weight then falls again. The gravitational potential energy is transformed into kinetic energy again. As the weight falls against the force of the spring, the kinetic energy is converted into potential energy in the spring. Work is done, but no energy is lost.
Absent friction, this will repeat
ad infinitum. Every time the energy is transformed from potential energy to kinetic energy and back, work is done, but the amount of energy in the system doesn't change.
If we allow for friction, then every time the weight moves and the spring compresses or releases, the energy required to overcome friction is transformed into heat. That energy is no longer available to "do work," but is still in the system as a higher temperature of the system.
otseng wrote: ↑Mon Jul 08, 2024 5:57 amSome energy can be stored permanently due to deformation, but that's just another form of potential energy.
If it's permanent, how would it have have any potential to release that energy?
Because the word "permanent" is used in a relative sense. It's the kind of simplification used to help students understand what's going on.
otseng wrote: ↑Mon Jul 08, 2024 5:57 amYour "dent in the floor" is actually an example of the structure failing and stored deformation energy being released back into the system.
There are dents all over my kitchen floor and there's no indication they will release their energy and return back to a smooth floor.
You misread or misunderstood what I wrote. The reason it's a dent is because the structure already failed and released the potential energy of deformation (which is the kind of potential energy in a spring).
otseng wrote: ↑Mon Jul 08, 2024 5:57 amSure, but you can't just wave your hands and say that the energy is in one of those forms.
My point is there are many forms of energy, not just thermal energy. Your original claim was that the final state of the flood must have all the energy converted into heat:
The situation that we're in is that I'm trying to simplify things enough to help you understand. You're then claiming that the simplifications mean that what I'm saying is wrong. You're
technically correct as far as that goes, but not for the reasons you think you are.
The amount of energy that is
not converted to heat is infinitesimal. There are other places that can act as
temporary energy sinks, but you're imagining that they're significant enough to account for the difference between a plausible, survivable Flood and one in which everything dies. There are no such energy sinks. The things that you're claiming are energy sinks ("work") are based on a misunderstanding of the physics.
otseng wrote: ↑Mon Jul 08, 2024 5:57 amMy claim is not all the energy would end up as thermal energy at the end of the flood, but would also be transformed into work
This is wrong, or perhaps more appropriately,
not even wrong. In the conservation of energy sense, energy isn't transformed into work. "Work" is a kind of convenient fiction for introducing the physics of energy and mechanics. "Work" typically means that energy has been transformed in a way that we find useful (or at least obvious), but it's not actually
something. When you throw a ball and our physics formula is precise enough, we'll have terms for various forms of potential energy and kinetic energy, mass and velocity, but none for "work". In a physics sense, chemical potential energy in my body is transformed into kinetic energy in my arm, transformed into kinetic energy in the ball, transformed into potential energy of gravity, back to kinetic energy, then to heat through friction with the air and ground. "Work" is just a nebulously defined term for some part of that that we wish to simplify. The "work" we did might be "throwing the ball" or "the ball moving from point A to point B" or somesuch, but there's nowhere to put "work" in the equations such that it makes some of the energy go somewhere. Throw a ball with some amount of energy and a few seconds later under nearly any circumstances, that energy has all become heat.
otseng wrote: ↑Mon Jul 08, 2024 5:57 amand other energy forms in addition to heat.
This may be
technically correct, but the fractions are tiny and simply represent other forms of potential energy. An example would be something like
the piezoelectric effect. That's why I asked to enumerate some of these ofther forms of energy. You seem convinced that they
must together be enough to keep Noah alive, but you don't actually know what they are.
otseng wrote: ↑Mon Jul 08, 2024 5:57 amI'm telling you that the energy that is no longer usable is heat.
Not sure what you mean by this. There's a difference between usable heat and unusable heat.
Even if we're being pedantic, what I said is still true. Even if some of the heat is usable, all of the unusable energy is in the form of heat. You mentioned heat death a while ago. Heat death is when all of the energy in the universe has been converted to heat and that heat is evenly distributed.
otseng wrote: ↑Mon Jul 08, 2024 5:57 amWhat I claim is a set of the initial energy has been transformed into work (moving of sediments, creation of geologic layers, moving of the crust, creation of mountains, etc). Going back to the simple example of creating a dent in the floor, the energy would be "stored permanently" in these transformations of the earth.
No. The dent itself doesn't store energy. The dent is evidence that the structure of the floor (or whatever) has failed. Energy was stored as deformation (like in a spring). Once the amount of energy that the material could store was exceeded, the structure failed and released the energy. The dent is an over-stretched spring.
otseng wrote: ↑Mon Jul 08, 2024 5:57 amAbsent friction, the energy could keep doing work over and over forever.
Sure, in a theoretical situation, energy and work can transform back and forth forever, but in our universe it's impossible.
Right. Because some of the energy is converted to heat via friction during each transformation.
otseng wrote: ↑Mon Jul 08, 2024 5:57 amFriction is always present, though, and transforms some of the energy into heat.
Yes. But where I disagree is all the energy would always be transformed into heat for a particular system.
If you're imagining this as anything more than technically (and temporarily) true, then you're wrong. You're wrong to at least four decimal places.
otseng wrote: ↑Mon Jul 08, 2024 5:57 amSure, in the ultimate final scenario, all energy could dissipate as heat, but that does not mean a particular system would.
In this case, you were talking about sound. When the sound can no longer be heard, it has become heat. The problem is that you think that I'm the one relying on some sort of technicality. If you're in a soundproof room and you yell, as soon as you stop hearing the sound, all of the sound energy from your yell is heat. The reason that seems so counterintuitive is because we're used to experiecing relatively tiny sounds in our relatively huge world.
otseng wrote: ↑Mon Jul 08, 2024 5:57 amLight works the same way. Light hitting a perfect mirror would cause an elastic collision. Light hitting a perfectly black surface would cause an inelastic collision and convert all of the light to heat. When light hits a wall, some is reflected again as light and some is converted to heat.
As long as you consider the sound and light to still be part of the system, that energy is conserved and will ultimately end up as heat.
I would disagree. Light is more complicated than that. It can also cause chemical changes as well as heat. So, not all energy (including light) ends up as thermal energy.
Light isn't more complicated than that, though one could create a few scenarios that are. If you were to create a photosynthetic wall, for example, and provide it with a source of carbon dioxide and water, a tiny amount of that energy would be stored in the higher energy state of glucose and oxygen. Is that what you had in mind? Do you think something like that is sinking the energy from a flashlight that you shine at the wall?