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Physics, Astronomy & Cosmology / Re: Where is the gravitational potential energy? School-level question.

« on: 31/12/2022 16:43:57 »

‘How to be a magnet’. It depends on the size of ferromagnetic and it’s crystal domain alignment.
In a half-field shell electrons are not paired and their tiny magnets are pointing in the same direction. This is intrinsic magnetism of electrons.
But if an atom is magnetic, it doesn’t need that the material made of lots of these atoms are magnetic.
Crystals. Ferromagnetic - a bunch of atoms are aligned in the same magnetic direction. Aligned domains (bunches of bunches) of atoms. This is a quantum property - aligned to macro size.
Domains of material can point in different directions.
Piece of iron may not have a magnetic field at all, because all domains are pointing to different directions.
However if you apply a strong magnetic field from outside the material, you can make one solid unified piece of magnet.
Magnetism is a quantum property magnified to the size of the object.
These criteria are difficult to fulfill. There are few materials that can do that: Fe, Co, Ni, Gd.

Wikipedia:
The magnetization of a magnetized material is the local value of its magnetic moment per unit volume, usually denoted M, with units A/m. A good bar magnet may have a magnetic moment of magnitude 0.1 A·m2 and a volume of 1 cm3, or 1×10−6 m3, and therefore an average magnetization magnitude is 100,000 A/m. Iron can have a magnetization of around a million amperes per meter.

Thanks for the link. But this rule does not always work. In our university laboratory, we used a press to draw stainless steel. After this process, part of the material was magnetized, and part was not. I can not understand how the material properties could change so much.

It depends on the steel grade. Google the article Behavior of steel as a living organism. There this phenomenon was described. My university supervisor was one of the co-authors of the article. Using plagiarism checker for students https://fixgerald.com/plagiarism-checker-for-students I took some of the material for my term paper. So it might be useful for someone else. Interesting analytics and research.

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The Environment / Re: Is global warming man-made?

« on: 28/12/2022 20:10:44 »

Perhaps all processes on earth are cyclical. Indeed, the world is warmer now. I remember when I was a child, every year in my city there was a lot of snow and it was quite cold. Now the winters are mostly warm, it rains. But I think this will change in a few decades.

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General Science / Re: How good would a diameter of 111 Km be for a cylinder of diamond 111 Km high?

« on: 28/12/2022 20:05:48 »

I think the rotation of the earth would snap it if it where anything like a column.

But it would rotate simultaneously with the earth.

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Just Chat! / Re: If you got some metallic osmium for X-Mas, what would you do with it?

« on: 28/12/2022 20:03:46 »

Unfortunately, I do not have sufficient knowledge and confidence to make osmium tetroxide or something like that) Therefore, I would just give it to someone who knows what to do with it better than me)

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Guest Book / Re: Science assignments

« on: 28/12/2022 19:58:05 »

At the university, you should have a chic library, spending time there you can get answers to all questions. It will be useful first of all for you. As you will have a lot of interesting and challenging tasks in your career after having obtained an Indener degree. And the ability to find the right information in the technical literature will help you a lot.

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New Theories / Re: Does GR laid the foundation for new ether?

« on: 28/12/2022 19:54:12 »

Perhaps you just need to refer to some sources to support your claims.

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Radio Show & Podcast Feedback / Re: Food waste, from The Naked Scientists 2 August 2022

« on: 27/12/2022 21:08:15 »

The decision not to indulge in sweets shows good willpower. I can't do that yet.

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The Environment / Re: How do we terraform a habitat?

« on: 27/12/2022 21:05:30 »

The first step, I think, would be to create the right atmosphere. And then you need to think in which direction to direct evolution.

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Physics, Astronomy & Cosmology / Re: How do thermoregulation fabrics work?

« on: 27/12/2022 21:02:15 »

The work of thermoregulating fabric is cyclical, it can both release heat and absorb it.

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General Science / Re: How good would a diameter of 111 Km be for a cylinder of diamond 111 Km high?

« on: 27/12/2022 21:00:00 »

If you build a pillar 111 km high, then it may not deform much due to the hardness of diamond.

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New Theories / Re: Is it mandatory to hire professional Wikipedia writer?

« on: 26/12/2022 10:59:37 »

I made a friend in university, she runs animal welfare and doing this from few years. She thought of creating Wikipedia page of her brand and products and to create online presences with unique tools and strategies but she is not professional Wikipedia writer because her English is weak. I suggested her to approach Harvey for professional Wikipedia writers, he is in this industry and have experience of writing. Has anyone before worked with him? I understand that there may be authors who write wonderful articles for Wikipedia, who do texts no worse than Harvey, but I unfortunately do not know of such. In college, I use write my assignment when I need to prepare my student assignments. But here a specialist is needed who understands the topic of animal protection and at the same time is a good content manager, perhaps on this forum I will find a recommendation of such a specialist.

Your friend is doing a noble job. I think she will be able to find some professionals to help her create her page. It will be easier.