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  1. Naked Science Forum
  2. Profile of Bored chemist
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Messages - Bored chemist

Pages: [1] 2 3 ... 1376
1
General Science / Re: What caused rope to spin while pulling stuff 6 stories up?
« on: Yesterday at 19:14:46 »
Most ropes have a twist to them; sometimes it's obvious, sometimes not.
But when you hang a load on the rope, it untwists a bit, and that's why the scaff poles twist.
But when you let the load off, it untwists again and that happens when you lower the rope back. But you are less likely to notice that.

2
New Theories / Re: What is the real meaning of the most-distant-quasar/galaxy?
« on: 02/07/2022 20:04:53 »
Quote from: Dave Lev on 02/07/2022 17:18:48
Why do you keep calling it "solid"?
I don't.

3
General Science / Re: electromagnetic waves detail
« on: 02/07/2022 19:33:06 »
You could listen for the harmonics but it won't really work.
If the signal runs from 20 KHz down to 1KHz then, to get it onto long wave radio (with a low frequency limit of 150KHz you have to listen to about the 150th harmonic.
That means  a signal that sweeps from 3MHz down to 150KHz over the course of a second or two.
But only the bit below about 300 KHz is long wave, so that's the only bit you will be able to receive.
Say you have your radio tuned to about 200 KHz,  It will pick up signals within about 9KHz of that frequency.
And the 150th harmonic of your whistler will sweep though that in well under a second.
All you would hear would be a click.
You would, I guess , get a series of clicks as each harmonic swept through the frequency you were tuned to.
I will leave the question of what you would get as an exercise for "the interested reader".

4
Just Chat! / Re: Why the fuss about "neguinho" (nigger) common in English until 1960
« on: 02/07/2022 17:39:41 »
Because it's no longer 1960.

5
New Theories / Re: How Many Numbers Exist?
« on: 02/07/2022 17:10:54 »
Quote from: Halc on 02/07/2022 15:02:08
I didn't read the whole thread, but perhaps you could quote the place where somebody asserted that this would be problematic.
Here
Quote from: hamdani yusuf on 02/07/2022 11:38:30
How can we say that they have one to one relationship?

6
New Theories / Re: What is the real meaning of the most-distant-quasar/galaxy?
« on: 02/07/2022 17:00:13 »
Quote from: Dave Lev on 02/07/2022 14:49:47
How can you compare a swarm of bees to liquid?
Because it will flow round an obstacle - unlike a solid.


Quote from: Dave Lev on 02/07/2022 14:49:47
Therefore, if the bees wish to establish a fixed shape - they can do it.
But they don't. So your "point" is meaningless, isn't it?


Quote from: Dave Lev on 02/07/2022 14:49:47
Liquid has no mind, no wish, no wings and therefore it can't set any fixed structure.
And the same is true of a galaxy of stars.
You just pointed out that I'm correct to say that they have characteristics in common.

Quote from: Dave Lev on 02/07/2022 14:49:47
That gravity can bond them in a fixed shape as M80 
It's still not a fixed shape is it?
Why are you pretending it is.


If it was solid, you couldn't fly a ship through it,could you?
If it was solid, the different bits couldn't be moving WRT eachother, could they?

Quote from: Dave Lev on 02/07/2022 14:49:47
Is it just to confuse the other side?
I don't need to "confuse" the other side if they can't distinguish a gas from a solid.
You are already confused, aren't you?

7
Technology / Re: Should games be used to train the military?
« on: 02/07/2022 14:39:41 »
Should games be used to train the military?
Should we use them instead of actual wars?

8
New Theories / Re: What makes Riemann's Hypothesis Hard to Prove?
« on: 02/07/2022 12:17:55 »
Quote from: hamdani yusuf on 02/07/2022 06:07:27
Quote from: Bored chemist on 01/07/2022 13:32:43
Quote from: hamdani yusuf on 01/07/2022 05:59:51
There must be some missing key ingredients not yet thought to be related to the problem.
No
It may not be provable.
Why? Do you have any reason to think that way? Or is it just your intuition?
It is known that some problems are impossible to solve- That's the incompleteness theorem.
I'm simply stating that this problem might be one of them.

And if that's true then this statement

Quote from: hamdani yusuf on 01/07/2022 05:59:51
There must be some missing key ingredients not yet thought to be related to the problem.
is false.
There may not be any missing ingredient that would allow you to solve it.

9
New Theories / Re: Origin of magnetic force
« on: 02/07/2022 12:05:27 »
Quote from: Eternal Student on 02/07/2022 11:58:26
I seem to have CoVid
Get well soon.

10
New Theories / Re: What is the real meaning of the most-distant-quasar/galaxy?
« on: 02/07/2022 12:02:40 »
Quote from: Dave Lev on 02/07/2022 10:21:52
Therefore, they behave as swarms of bees but instead of just common wish to stay together, they share a gravitational attraction that force them to stay together.
And a swarm of bees is not a solid, is it?

11
New Theories / Re: What is the real meaning of the most-distant-quasar/galaxy?
« on: 02/07/2022 12:01:27 »
Quote from: Dave Lev on 02/07/2022 06:31:47
Well, in a swarm of bees they are bonded together by their common wish to stay together.
Which would make them more like a liquid than a solid, wouldn't it?
A liquid has no fixed shape, and nor does a swarm.

So will you please stop trying to say that a galaxy (or any part of it bigger than a planet) is solid.
It just isn't.

12
New Theories / Re: How Many Numbers Exist?
« on: 02/07/2022 11:57:29 »
Quote from: hamdani yusuf on 02/07/2022 11:38:30
Quote from: Bored chemist on 01/07/2022 09:59:31
Apparently, the complex numbers have the same cardinality as the reals and I'm tempted to assume that the hypercomplex ones do too.
There are as many real numbers in a set of complex numbers where imaginary parts is 0. Like wise, there are as many real numbers in a set of complex numbers where imaginary parts is 1. You can change the imaginary part with any magnitude. Each of them contains a whole set of real numbers. How can we say that they have one to one relationship?

Infinite sets are weird.
https://en.wikipedia.org/wiki/Hilbert%27s_paradox_of_the_Grand_Hotel
There are as many even numbers as there are integers (because every even number is twice an integer).
There are as many odd numbers as there are integers (because every even number is twice an integer with 1 added to the product).

There are similarly as many multiples of 3 as there are integers.
Ditto multiples of 4, 5 ... etc.
So the integers are the union of an infinite number of infinite sets sets.
But the cardinality stays the same.

So why would there be a problem with the complex numbers having the same cardinality as the reals?

13
New Theories / Re: What is the real meaning of the most-distant-quasar/galaxy?
« on: 01/07/2022 23:48:33 »
Quote from: Dave Lev on 01/07/2022 20:12:19
The bar is a key element in the spiral galaxy.
Yes.
But it isn't solid.
Quote from: Dave Lev on 01/07/2022 20:12:19
The bar looks stable
So does a picture of a swarm of bees

14
Chemistry / Re: How do I grow a spinel crystal?
« on: 01/07/2022 23:41:37 »
The ones with titania in aren't very helpful.
The lowest liquid phase temperature seems to be about 1100 or 1150C
That's a lot better than you get with MgO/ Al2O3

15
New Theories / Re: Can we draw a geometrical representation of gravity?
« on: 01/07/2022 15:37:34 »
Can we draw a geometrical representation of gravity?
Yes.
↓

16
New Theories / Re: What is the real meaning of the most-distant-quasar/galaxy?
« on: 01/07/2022 13:35:01 »
Quote from: Dave Lev on 30/06/2022 21:19:28
They see a star in the spiral arm and they think that it should hold itself by its own gravity to the center of the galaxy.
In other words - they totally ignore the impact of the arm.
Please provide evidence that they think that , or anything like it.

17
New Theories / Re: What makes Riemann's Hypothesis Hard to Prove?
« on: 01/07/2022 13:32:43 »
Quote from: hamdani yusuf on 01/07/2022 05:59:51
There must be some missing key ingredients not yet thought to be related to the problem.
No
It may not be provable.

18
New Theories / Re: How Many Numbers Exist?
« on: 01/07/2022 09:59:31 »
Quote from: hamdani yusuf on 01/07/2022 08:53:37
https://twitter.com/pickover/status/1541962088926560256?t=ml0TBOGlhgCZIKDaLXserg&s=03
There are many hypercomplex numbers known by modern math. Do they have the same size as real number?
Apparently, the complex numbers have the same cardinality as the reals and I'm tempted to assume that the hypercomplex ones do too.
https://quizlet.com/explanations/questions/show-that-c-the-set-of-complex-numbers-has-the-same-cardinality-as-r-the-set-of-real-numbers-cf3e343a-9b5b-4f78-8a0c-0dcfe9ee5b15



19
New Theories / Re: How Many Numbers Exist?
« on: 01/07/2022 09:51:35 »
Quote from: BilboGrabbins on 15/10/2021 21:47:47
It's sort of the point here. Physics breaks down below this length.
I wonder if Bilbo thinks that physics breaks down for objects smaller than the Planck mass which is about 21 µg
On a day-to-day basis 21µg is a pretty small mass, but it's not impossibly small.
It's about the mass of a million bacteria.

(And I'm still waiting for him to explain what angles I'm not allowed to orient my coffee table.)



20
New Theories / Re: Molecular chain that would end all life? Causality Firewall of life/ CFL?
« on: 30/06/2022 19:14:19 »
Quote from: Alex Dullius Siqueira on 30/06/2022 14:11:31
 Unclear.
Deeply.

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