1

New Theories / Re: How many times would a light ray be reflected inside a circular mirror?

« on: Today at 12:06:16 »

That's a logical fallacy called appeal to authority.

It's not a fallacy if they are an authority.


Anyway, here's what I said about it the last time the subject came up.

The force which the photons exert does not necessarily mean there is  transfer of energy. Energy is transferred when the force moves through a distance
In order to be perfectly reflective the walls have to be infinitely massive (this causes other problems).

However, there's another way to do it.
You can imagine a nearly massless mirror.
When a photon hits it, it will move and take some energy from the photon. But that means that, when another photon hits it on the other side, it will add energy to that photon.
Overall, the sum of the energies will be conserved The wavelengths of the photons will be "scrambled" and will settle down to a black-body distribution.
The energy (on average) imparted to the light, rigid mirror will be Boltzmann's constant times 3 times the temperature. (That's the same energy as would be carried by an electron or proton at that temperature.)

2

New Theories / Re: How many times would a light ray be reflected inside a circular mirror?

« on: Today at 11:59:04 »

It implies that the mirror has infinite mass

That's exactly wrong.

3

Physics, Astronomy & Cosmology / Re: Is there a net heat exchange between water and ice at 0 degree C?

« on: Today at 00:48:12 »

Yet again, you have discovered the meaning of "average".

That's the whole story here, neatly summarised by Alan.

4

Physiology & Medicine / Re: How effective was deer skin for preventative sex?

« on: Today at 00:45:40 »

Boredom, usually.

Did it usually include a deerskin?
(asking for a friend)

5

New Theories / Re: what is temperature?

« on: Today at 00:43:40 »

In your point of view, everyone who disagree with you is stupid, which is virtually everyone writing in this thread,

OK
That's misrepresentation but...
I'm happy to take a straw poll on that
Who thinks  that HY knows more about science than I do?

6

New Theories / Re: what is temperature?

« on: Today at 00:41:39 »

Wiki is not God.

Of course not. But it represents common knowledge of many contributors, with many of them are expert in their fields. If you disagree with them, at least you need a supporting evidence to show their mistakes.

Or...
https://en.wikipedia.org/wiki/Lie-to-children

7

New Theories / Re: What is the real meaning of the most-distant-quasar/galaxy?

« on: Yesterday at 18:10:47 »

If I understand Halc correctly,

The odds are against that.

8

New Theories / Re: what is temperature?

« on: Yesterday at 17:16:27 »

It depends.

On what, exactly?

If you had spent time learning and thinking, you might know by now.
Instead, you spend time saying stupid things like

You are puzzled that I disagree with you, but can't point out which point you disagree on.

9

New Theories / Re: what is temperature?

« on: Yesterday at 17:13:41 »

You are puzzled that I disagree with you

No

I remain puzzled that, rather than following the recommendation, you pretend that it didn't exist.

And again, you seem to ignore what I actually say.

10

Physiology & Medicine / Re: How effective was deer skin for preventative sex?

« on: Yesterday at 16:30:53 »

"How effective was deer skin for preventative sex?"
What is the sex seeking to prevent?

11

New Theories / Re: what is temperature?

« on: Yesterday at 16:00:04 »

I offered a suggestion on where to start.

Where should I start?

learn science.

12

General Science / Re: Are Black Holes The Blackest Things Ever ?

« on: Yesterday at 15:55:29 »

They're not perfectly black, but they're blacker than a place in space with no stars in it.

The black sheep don't quite win, but close.

Why is the one in the middle winking at us?

13

New Theories / Re: How many times would a light ray be reflected inside a circular mirror?

« on: Yesterday at 15:52:18 »

Then why did you write this?

I was making the point that maths problems don't have to obey the laws of physics.

14

New Theories / Re: How many times would a light ray be reflected inside a circular mirror?

« on: Yesterday at 15:51:15 »

Your last sentence above is especially suspicious.

Did it lead you to suspect that I know more than you?

If someone who makes a living as a scientist says something about science, it is worth considering that it is correct, rather than assuming that it isn't.

15

New Theories / Re: what is temperature?

« on: Yesterday at 15:49:11 »

It's a little beside the point.
Thermal energy still is more than just kinetic energy.

The main question in this topic is about temperature. Wikipedia article says it's about average kinetic energy.

Wiki is not God.

16

New Theories / Re: what is temperature?

« on: Yesterday at 15:48:48 »

My message was that if you thought about it, you might work out the answer.
How is that the same as saying "I  don't  know"?

If you said "I  don't  know", I might work out to find the answer. What's the difference?

I offered a suggestion on where to start.

Guess.
or, even better, learn science.

I remain puzzled that, rather than following the recommendation, you pretend that it didn't exist.
Why won't you learn?

17

Plant Sciences, Zoology & Evolution / Re: Have animal reactions to mirrors and windows been studied?

« on: Yesterday at 13:39:06 »

The reason for this behavior is not clear, but it is known to be a very stupid species with severely defective vision.

That's unfair; our vision is within an order of magnitude or so of being diffraction or quantum limited. We are getting close to the "diminishing returns" issue there.
We also have much better colour vision that many species (though others have better).
 
I can't argue against the claim that the species is stupid.
On the other hand

Fish and birds are often observed to attack their reflections, but whether this is due to stupidity or extreme intelligence (watch a boxer practicing in front of a mirror to sharpen his reflexes) is not clear.

Are you saying that boxers are the most intelligent of our species?

18

Chemistry / Re: How can I find the optimum ΔH and ΔS for passive T control?

« on: Yesterday at 13:36:43 »

Sometimes the number you need is "about a hundred or a thousand" which is the right ballpark for how much denser a solid is, compared to the vapour near atmospheric pressure.

Which is why I suggested using a liquid. Or a sublimating solid.

Ok, because the vapour takes up an impractical amount of space you suggested turning a solid or liquid into the (impractical)  vapour.
Were you aiming to fail?

19

Physics, Astronomy & Cosmology / Re: Is there a net heat exchange between water and ice at 0 degree C?

« on: Yesterday at 13:32:56 »

But a water body with 0°C average temperature has various local temperature. So does the ice. Moreover,
0°C ice can receive heat energy without changing its temperature, by melting.
0°C water can give away heat energy without changing its temperature, by freezing.

And, on average, these cancel out which is why the answer to your question
"Is there a net heat exchange between water and ice at 0 degree C?"
Is still no- just like everyone has said all along.

20

New Theories / Re: what is temperature?

« on: Yesterday at 13:14:18 »

So why did you introduce Wigner?

Because you asked about the Windscale fire.

I didn't "ask" I pointed out that it was a counter example to your assertion that

The potential energy of a strained lattice may be enormous, but as that can't be transferred by thermal conduction to another body,

It's a little beside the point.
Thermal energy still is more than just kinetic energy.