[Archive!] Pure mathematics, physics, chemistry, etc.: brain-training problems not related to trade in any way - page 36
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There is no such thing as an aeroplane that is accelerated to take-off (breakaway) speed by the wheels.
Such a drive would weigh the plane down, it wouldn't work in the air, it would only work on take-off, so no.
Такой привод утяжелил бы самолёт, в воздухе он бы не работал, работал бы только на взлёте, поэтому и нет.
There are a lot of reasons, including the fact that conventional rubber bluntly tears at 230 km/h (the limit of strength, without cords), and here it must without slippage and pull this heavy smelly tyre - at speeds up to 400 km/h.
I am writing in such detail so that you colleagues will argue less. If a barrel can withstand the increase in pressure when a bubble forms at the bottom, it will also withstand its upward movement.
The experience of last night's discussion has shown that no matter how thoroughly you explain it, no matter how much you spell it out, everyone will stick to their opinions. Real men do not change their minds! :-)))
And how many times has the pressure increased? The barrel is not expanding. The liquid is not compressing. The volume increased when the bubble appeared, and, theoretically, the pressure will increase an infinite number of times. Once again, the appearance of a bubble under these conditions is impossible.
And how many times has the pressure increased? The barrel is not expanding. The liquid is not compressing. The volume increased when the bubble appeared, and, theoretically, the pressure will increase an infinite number of times. Once again, the appearance of a bubble under such conditions is impossible.
It appeared under different conditions))) In the problem, it was already there.
he appeared under different conditions))) It was already in the problem.
So how did it appear then? The liquid is not contracting. The barrel is not expanding. The "beer" isn't going anywhere.
Вот ещё одна прикольная задачка.
У нас имеется деревянная бочка с шампанским. Давление шампанского близко к пределу прочности бочки (ещё чуть-чуть... и БАХ!). От дна бочки отрывается пузырёк углекислого газа и утремляется в верх. Приведёт ли сей факт к смерти бочки с шампанским?
Жидкость считать не сжимаемой. Бочку не деформируемой. Пузырёк газа всего один и он не размножается. Бочка заполнена полностью (пузырьков, кроме упомянутого, нет). Все условия считать идеальными. Переходных процессов нет.
This will cause the keg to explode. An increase in temperature can cause a bubble to appear at the bottom of the cask. As the temperature increases, the dissolved gas content of the liquid decreases with the formation of gas bubbles, causing the pressure in the barrel to increase. I can't remember what law describes the relationship between V,T,P.
This will cause the keg to explode. An increase in temperature can cause a bubble to appear at the bottom of the cask. As the temperature increases, the dissolved gas content of the liquid decreases with the formation of gas bubbles, causing the pressure in the barrel to increase. I can't remember what law describes the dependence of V,T,P.
Mendeleev-Clapeyron equation.
So how did it come about then? The liquid is not contracting. The keg is not expanding. The "beer" isn't going anywhere.
So the keg expands when the bubble appears. It can't expand any more, it'll burst. It doesn't make any difference in principle - it's an abstract problem.