[Archive!] Pure mathematics, physics, chemistry, etc.: brain-training problems not related to trade in any way - page 89
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ОТВЕТ на задачу №6, про гайку:
-
Как могла металлическая гайка плавать на воде и выпрыгнуть из ведра? Все подумали, что гайка стальная, однако, я этого не писал.
Гайка сделана из калия. А как это происходит, хорошо видно вот на этом видео: https://www.youtube.com/watch?v=6kVOyqyt5UI
К сожалению нет видео с 100-граммовым куском, но эффект там гораздо лучше. Повторять не советую - очень опасно.
I can hardly imagine what can be fixed with a potassium nut.
ОТВЕТ на задачу №6, про гайку:
-
Как могла металлическая гайка плавать на воде и выпрыгнуть из ведра? Все подумали, что гайка стальная, однако, я этого не писал.
Гайка сделана из калия. А как это происходит, хорошо видно вот на этом видео: https://www.youtube.com/watch?v=6kVOyqyt5UI
К сожалению нет видео с 100-граммовым куском, но эффект там гораздо лучше. Повторять не советую - очень опасно.
Mathemat gave the right answer. Other metals of the alkaline group would probably be fine.
ANSWER to problem #7, about nails:
MetaDriver, I understand that you are confused by the fact that the metal of the nails is the same. That's exactly what a lot of people think. They think there should be no EMF in the circuit. However, this is not the case. I purposely took a solution of table salt, so that everyone could try this experiment from the comfort of their own homes. Whoever doubts that this galvanic cell will produce EMF - just try it. The trick is that the contact area of the nails with the solution is different, so that the EMF will necessarily be different from zero.
Mathemat gave the right answer. Other metals of the alkali group would probably work as well.
joo, where is his answer, I can't find it?
Sodium usually doesn't fly out of water, lithium even less so. Rubidium is generally a combustible in air.
Да, довольно таки просто.
Am I correct in assuming that three points are also enough ?I can hardly imagine what can be fixed with a potassium nut.
Potassium is not a good idea. But gold and platinum nuts are sometimes made.
joo, А где его ответ, я не могу найти? 1)
Натрий обычно не вылетает из воды, литий - тем более. Рубидий - вообще загорается на воздухе. 2)
1) I can't show you where, it's 89 pages too long. I just remember.
2) I didn't do the experiments myself, I just made an assumption.
1) I can't show you where, it's 89 pages too long. I just remember.
2) I didn't do the experiments myself, I just made an assumption.
OK, Mathamat's answer is accepted as correct.
Я правильно понимаю, трёх точек тоже достаточно ?
You have to use 4 points.Through 3 points you can build many squares. And through 4 only one (if there was one at all, because not every 4 points can be used to build a square).
Нужно использовать 4 точки.Через 3 точки можно построить множество квадратов. А через 4 только один.
"Envelope" drawing?
no, bullshit.
Well, maybe it's time to share with the public.