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  4. Can heat affect Earth's rotation?
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Can heat affect Earth's rotation?

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Offline gem

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Re: Can heat affect Earth's rotation?
« Reply #80 on: 17/08/2020 00:29:17 »
In regards to Earth’s interaction with something else, just concentrating on the electromagnetic energy received and we have already quantified this value relative to the rotational Kinect energy,
we know this energy input contravenes the conditions required for the laws of conservation of momentum
We can observe these chains of events of various energy transfers that the Suns energy induces, for example the variations in pressure/temperature generating velocity and number of collisions of the molecules of the atmosphere fluctuations.
The friction of the millions of metric tons of water dropped down to the surface at velocity’s not in accordance with conservation of momentum, the dynamics of the waves of the oceans.
The wind passing across earth’s surface with varying degrees of friction, depending on the type of surface, all start chains of events that can and does impact on the sum total of earth’s Momentum through transfer of earth’s rotational energy to other forms , that are not compatible with conservation of momentum.



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Offline Bored chemist

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Re: Can heat affect Earth's rotation?
« Reply #81 on: 17/08/2020 08:33:46 »

Quote from: gem on 17/08/2020 00:29:17
In regards to Earth’s interaction with something else, just concentrating on the electromagnetic energy received and we have already quantified this value relative to the rotational Kinect energy,
we know this energy input contravenes the conditions required for the laws of conservation of momentum
We can observe these chains of events of various energy transfers that the Suns energy induces, for example the variations in pressure/temperature generating velocity and number of collisions of the molecules of the atmosphere fluctuations.
The friction of the millions of metric tons of water dropped down to the surface at velocity’s not in accordance with conservation of momentum, the dynamics of the waves of the oceans.
The wind passing across earth’s surface with varying degrees of friction, depending on the type of surface, all start chains of events that can and does impact on the sum total of earth’s Momentum through transfer of earth’s rotational energy to other forms , that are not compatible with conservation of momentum.




You forgot the only important thing you need to explain.
Where is the external torque?
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Offline gem

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Re: Can heat affect Earth's rotation?
« Reply #82 on: 18/08/2020 00:39:10 »
Hi, so in regards to the point regarding an outside torque force, I covered that in previous posts with the laws of conservation of energy/momentum.
In regards to the 3 milli second annual range in the LOD, you misunderstand me, I am not attributing that to the variation in solar flux.
And yes huge amounts of energy do (pour in as solar radiation) and huge amounts exit in different forms of energy as per the laws of conservation of energy due to the various energy dynamics occurring here on Earth on a approximate balance between input/output, some of these transfers have been empirically been linked to variation to LOD
So the question at this point should be why you believe momentum is protected from these transfers of energy.

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Offline Bored chemist

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Re: Can heat affect Earth's rotation?
« Reply #83 on: 18/08/2020 08:38:06 »
Quote from: gem on 18/08/2020 00:39:10
So the question at this point should be why you believe momentum is protected from these transfers of energy.
Because it is a conserved quantity.
To change it, you need to apply a torque.
That really is high school maths.

The proof (which I accept isn't high school maths) was worked ou a hundred years ago.
https://en.wikipedia.org/wiki/Noether%27s_theorem

So the question is, why don't you accept it?

« Last Edit: 18/08/2020 08:42:43 by Bored chemist »
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Offline gem

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Re: Can heat affect Earth's rotation?
« Reply #84 on: 18/08/2020 09:36:31 »
Because of the laws of conservation of energy and ironically the mathematical proof you refer to links from the same pages below.
https://en.m.wikipedia.org/wiki/Closed_system

https://en.m.wikipedia.org/wiki/Isolated_system

As the requirement That underpins Noether Theorem is a closed/ isolated system.
In classical physics.
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Offline Bored chemist

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Re: Can heat affect Earth's rotation?
« Reply #85 on: 18/08/2020 10:44:28 »
Yes.
And...?

What it says is "a physical system so far removed from other systems that it does not interact with them."
And, unless you can show the means by which the Earth interacts (in a relevant way) with anything you have proved my point for me.
You seem to be conflating two different sets of criteria which are not as well defined here as you seem to think.
A system is isolated enough for angular momentum to be conserved , provided that it is isolated from any torque.Imagine we put a pair of huge lasers on opposite sides of the equator, both pointing west.
They would provide a torque and alter the spin of the Earth.
And they would also apply a torque to the rest of the universe.
The angular momentum of the universe as a whole would be conserved.
If you turn one of the lasers round so it faces east, then they would provide a net force on the Earth and would change its  linear momentum.
And again, the rest of the universe would be pushed the other way so the linear momentum of the whole universe would be conserved.

Now imagine that we put a big black box round the Earth.
The lasers still alter the angular or linear momentum of the Earth.
They also alter the momentum of the box such that the sum of the momentum of the Earth and the box stays the same.

Now imaging tethering the box to the Earth so it can't translate or rotate with respect to  Earth- obviously, that would involve spinning it at 1 rev per day.

All the lasers would do would be to put a force on the tether ropes. They wouldn't actually make anything move, would they?

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Offline gem

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Re: Can heat affect Earth's rotation?
« Reply #86 on: 18/08/2020 17:49:58 »
Hi all so in regards to conflating the criteria, let’s start with the first couple of paragraphs of  the laws of conservation of momentum
https://en.m.wikipedia.org/wiki/Conservation_of_momentum
It states the momentum of an isolated system remains constant.
And if you follow the links for definitions of closed and isolated you get the clarification of this  not my words just the laws of conservation

(classical mechanics   
In nonrelativistic classical mechanics, a closed system is a physical system that doesn't exchange any matter with its surroundings, and isn't subject to any net force whose source is external to the system.[1][2] A closed system in classical mechanics would be equivalent to an isolated system in thermodynamics. )
And this states for an isolated system

(An isolated system cannot exchange any heat, work, or matter with the surroundings,)

Therefore as stated by the previous posts Regarding the solar energy received, Earth does not meet the criteria in regards to conservation of momentum. As stated by the laws of conservation of energy with no mention of an outside torque force required, just the transfer of energy is sufficient.

Maybe your mixing up closed and isolated.
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Offline Bored chemist

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Re: Can heat affect Earth's rotation?
« Reply #87 on: 18/08/2020 18:10:44 »
My phone is sat on the table in front of me.
It is neither an isolated, nor a closed system.
And yet, it will not suddenly start spinning.

What you need to have, to get it spinning, is a torque.
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Offline Bored chemist

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Re: Can heat affect Earth's rotation?
« Reply #88 on: 18/08/2020 18:12:27 »
Quote from: Bored chemist on 18/08/2020 18:10:44
My phone is sat on the table in front of me.
It is neither an isolated, nor a closed system.
And yet, it will not suddenly start spinning.

What you need to have, to get it spinning, is a torque.

Quote from: gem on 18/08/2020 17:49:58
As stated by the laws of conservation of energy with no mention of an outside torque force required, just the transfer of energy is sufficient.
They do not say that.

Show me how it could work.
Show me how something could start (or stop) spinning without a torque.
And then show me any sort of calculation for the rate at which the angular momentum changes.
That's going to trip you up.
The rate of change of angular  momentum is the torque divided by the moment of inertia.
If the torque is zero then the change in angular momentum is also zero.
« Last Edit: 18/08/2020 18:15:59 by Bored chemist »
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Offline Halc

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Re: Can heat affect Earth's rotation?
« Reply #89 on: 18/08/2020 20:42:47 »
Quote from: gem on 18/08/2020 17:49:58
Hi all so in regards to conflating the criteria, let’s start with the first couple of paragraphs of  the laws of conservation of momentum
https://en.m.wikipedia.org/wiki/Conservation_of_momentum
It states the momentum of an isolated system remains constant.
And yet you will switch to energy before this post is over. Energy has nothing to do with conservation of momentum.

Quote
In nonrelativistic classical mechanics, a closed system is a physical system that doesn't exchange any matter with its surroundings, and isn't subject to any net force whose source is external to the system.[1][2] A closed system in classical mechanics would be equivalent to an isolated system in thermodynamics. )
No mention of energy I see.

Quote
Therefore as stated by the previous posts Regarding the solar energy received, Earth does not meet the criteria in regards to conservation of momentum.
No, because there are external forces acting on Earth.  It has nothing to do with the solar energy, since that itself applies neither force nor torque to the planet.  Gravity on the other hand exerts a force, therefore the momentum of Earth is not constant, and that momentum necessarily is transferred to other objects. Tides exert a significant torque, therefore the momentum is transferred via reaction-torque to other forms. There is no other significant torque. Gravity waves exert a torque, and thus radiate away some of Earth's orbital momentum, so the angular momentum of Earth's orbital energy is actually radiating away at a rate of about 200w, which is less than some of my light-bulbs. That is an awful lot of significant digits less than the torque from the tides, which work in the opposite direction (increasing the orbit).

Only net force has an effect on momentum. Not energy. Yes, from an energy standpoint, the solar system is a completely open system, radiating energy at a furious pace into space. That has no effect on either the momentum or the angular momentum of the solar system.

Quote
As stated by the laws of conservation of energy with no mention of an outside torque force required, just the transfer of energy is sufficient.
The energy laws are irrelevant to momentum laws. Indeed, no force need be applied to change the energy of a system any more than energy needs to be applied to change the momentum of a system. B-C's phone is not only on the table, but it's charging there, and that input of energy doesn't get it sliding or spinning now, does it?  There is no torque between it and the table, so no change in angular momentum, regardless of its status of receiving energy.
« Last Edit: 18/08/2020 21:07:33 by Halc »
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Offline Petrochemicals

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Re: Can heat affect Earth's rotation?
« Reply #90 on: 18/08/2020 21:51:49 »
Quote from: Halc on 18/08/2020 20:42:47
  There is no torque between it and the table, so no change in angular momentum, regardless of its status of receiving energy.
(Unless its kinetic energy)
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Offline Bored chemist

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Re: Can heat affect Earth's rotation?
« Reply #91 on: 18/08/2020 22:17:05 »
Quote from: Petrochemicals on 18/08/2020 21:51:49
Quote from: Halc on 18/08/2020 20:42:47
  There is no torque between it and the table, so no change in angular momentum, regardless of its status of receiving energy.
(Unless its kinetic energy)
Even then, there's no guarantee.
I could install a pair of contra-rotating flywheels in my phone. As long as they are a matched pair there's no net exchange of angular momentum.
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Offline gem

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Re: Can heat affect Earth's rotation?
« Reply #92 on: 18/08/2020 23:07:23 »
So it is stated an isolated system is a requirement for conservation of momentum

https://upload.wikimedia.org/wikipedia/commons/8/8f/Diagram_Systems.png

And Halc states the energy laws are irrelevant to the momentum laws

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Offline Bored chemist

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Re: Can heat affect Earth's rotation?
« Reply #93 on: 18/08/2020 23:13:47 »
Do you realise that the conservation laws are laws of nature and the terms " isolated" and "closed" are entirely arbitrary?

There are no isolated systems, not any closed ones.
We can not put a box round something to block gravity waves. Nor can we stop things tunnelling.
Even black holes evaporate.

So stop trying to use  "lies we tell to children" concepts to overturn  maths.


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Offline Bored chemist

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Re: Can heat affect Earth's rotation?
« Reply #94 on: 18/08/2020 23:14:54 »
Quote from: gem on 18/08/2020 23:07:23
And Halc states the energy laws are irrelevant to the momentum laws
He's right.
They are entirely independent quantities,
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Offline Petrochemicals

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Re: Can heat affect Earth's rotation?
« Reply #95 on: 19/08/2020 01:22:39 »
Quote from: Halc on 19/08/2020 00:25:41
Quote from: Petrochemicals on 18/08/2020 21:51:49
Quote from: Halc on 18/08/2020 20:42:47
  There is no torque between it and the table, so no change in angular momentum, regardless of its status of receiving energy.
(Unless its kinetic energy)
I can impart kinetic energy to a system without any external application of force from outside the system, so this is wrong.

Nuh huh.

I can impart kinetic energy{ via acceleration from outside the system ?} to a system without any external application of force from outside the system ???

https://en.m.wikipedia.org/wiki/Kinetic_energy
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Offline Bored chemist

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Re: Can heat affect Earth's rotation?
« Reply #96 on: 19/08/2020 08:45:17 »
Quote from: Petrochemicals on 19/08/2020 01:22:39
Quote from: Halc on 19/08/2020 00:25:41
Quote from: Petrochemicals on 18/08/2020 21:51:49
Quote from: Halc on 18/08/2020 20:42:47
  There is no torque between it and the table, so no change in angular momentum, regardless of its status of receiving energy.
(Unless its kinetic energy)
I can impart kinetic energy to a system without any external application of force from outside the system, so this is wrong.

Nuh huh.

I can impart kinetic energy{ via acceleration from outside the system ?} to a system without any external application of force from outside the system ???

https://en.m.wikipedia.org/wiki/Kinetic_energy
That doesn't actually make much sense.

Are you trying to say that you don't understand how wireless charging could drive a fan?
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Offline Bored chemist

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Re: Can heat affect Earth's rotation?
« Reply #97 on: 19/08/2020 08:48:24 »

I'm still waiting for someone to explain how there's a change in angular momentum without a torque .
How do you get round this ?
Quote from: Bored chemist on 18/08/2020 18:12:27
The rate of change of angular  momentum is the torque divided by the moment of inertia.
If the torque is zero then the change in angular momentum is also zero.
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Offline gem

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Re: Can heat affect Earth's rotation?
« Reply #98 on: 19/08/2020 09:20:33 »
Thanks petrochemicals, I made that point in my first post in this thread #38
BC every time you see trees bending in the wind. think about what age you were when you learnt about momentum.
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Offline Bored chemist

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Re: Can heat affect Earth's rotation?
« Reply #99 on: 19/08/2020 10:36:19 »
Quote from: gem on 19/08/2020 09:20:33
Thanks petrochemicals, I made that point in my first post in this thread #38
BC every time you see trees bending in the wind. think about what age you were when you learnt about momentum.
In a practical sense, whatever age I was when I first ran into something.

Stop posting drivel and answer the question.

Quote from: Bored chemist on 19/08/2020 08:48:24

I'm still waiting for someone to explain how there's a change in angular momentum without a torque .
How do you get round this ?
Quote from: Bored chemist on 18/08/2020 18:12:27
The rate of change of angular  momentum is the torque divided by the moment of inertia.
If the torque is zero then the change in angular momentum is also zero.

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