[Archive!] Pure mathematics, physics, chemistry, etc.: brain-training problems not related to trade in any way - page 37
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Опыт ночной дискуссии показал, что как подробно ни объясняй, как ни разжевывай все равно каждый останется при своем. Настоящие мужики мнений своих не меняют ! :-)))
It's a matter of simple logic and elementary physics. It won't take off. It's like if you were to run up an escalator going down. The belt would increase in speed every time you would increase yours. Planes (don't know about you) can't fly at zero speed relative to the ground (the air is stationary).
Think of a treadmill,
put yourself on that treadmill, a bicycle. Put a car, that's how movies used to be made, put the wheels of the car in special rollers, it would "ride" while staying in place. It doesn't matter what pushes, the turbine or the wheel itself, it doesn't matter at all. If the belt is steered according to your speed, your speed relative to the ground would be zero. It would only take off with one condition, if it was allowed to spin. Well, put a model aeroplane on that track - just imagine :o)
Yuri, it's elementary. Similarly with flies, there is nothing difficult there :o) Note, I'm not considering your power of thought, you can lift anything into the air with it.
Настоящие мужики мнений своих не меняют ! :-)))
No, they don't!
They also press the accelerator and the brake at the same time :-)
As for the champagne barrel problem, there was already a single small bubble at the bottom of the barrel (this is the key point in the problem). The rest of the space is filled with an incompressible liquid in a non-deformable barrel. It does not matter how this gas bubble was formed, it does not matter what kind of gas it consists of, and it does not matter the reason why it flew from the bottom of the barrel to its top lid.
Question: Will the pressure in the barrel increase as a result?
No, they don't!
They also press the accelerator and the brake at the same time :-)
As for the champagne barrel problem, there was already a single small bubble at the bottom of the barrel (this is the key point in the problem). The rest of the space is filled with an incompressible liquid in a non-deformable barrel. It does not matter how this gas bubble was formed, it does not matter what kind of gas it consists of, and it does not matter the reason why it flew from the bottom of the barrel to its top lid.
Question: Will the pressure in the barrel increase as a result?
So which wall is the pressure? It is different in the beginning. The bottom is one pressure, the lid is another, the walls another. And it even depends on the level on the wall.
Дело в простой логике и элементарной физике. Не взлетит. Это все равно, что если бы ты взбегал вверх на эскалатор, идущий вниз. При этом лента увеличивала бы скорость всякий раз, как только ты бы увеличивал свою. Самолеты (про тебя не знаю) не умеют летать при нулевой скорости относительно земли.
Вспомни беговую дорожку,
поставь на эту дорожку себя, велосипед. Поставь машину, так раньше фильмы снимали, ставили колеса машины в специальные валики, она "ехала", оставаясь на месте. Не важно, что толкает, турбина или само колесо, совершенно не важно. Если лента управляется в соответсвии с твоей скоростью, то твоя скорость относительно земли будет нулевой. Он взлетел бы только с одним условием, если бы допускалось проворачивание. Ну поставь ты на эту дорожку модель самолетика, - просто представь :о)
Sergey, you are completely wrong!
The plane will take off for the simple reason that it is pushed by its turbines (propeller) from the air, which has nothing to do with the track. It is clear that under these conditions the track will spin the wheels of the plane to any infinitely high speed, but the plane does not care, it will not even notice it - slowly and surely (as if nothing had happened) it will accelerate relying on the air relative to the air and soar into the air.
так давление на какую стенку? Оно изначально разное. На дно - одно давление, на крышку - другое, не стенки третье. Причем даже зависит от уровня на стенке.
There is a limit to the strength of the drum material, which is defined as overpressure. Exceeding this is what will cause the keg to collapse. It doesn't matter whether the excess pressure is at the bottom, on the walls, or at the lid of the keg itself.Confuse the plane with the tram, figuratively speaking. Put a bird on a treadmill. Will it fly? Yes.
Will a baby helicopter fly off a treadmill? Yes.
The paradox of the problem is imaginary and is that we are looking at the legs (wheels), but we have to rely on the wings.
So what if the bird's legs will move quickly, it does not accelerate itself with legs, but with wings. That is why, there is no problem with acceleration - you push your legs up (jump up) and that's all - you are in the air.
The same is with the plane - engine-air. That's it. The fact that someone or something is spinning the wheels doesn't matter. It's more of a question of what frame of reference to use. The answer, of course, does not depend on it, but the clarity of the solution does.
There is a limit to the strength of the barrel material, which is defined as overpressure. Exceeding this is what will cause the keg to collapse.
then it won't explode. That's because the pressure on the bottom was maximum and the pressure on the lid was much less. At the moment of resurfacing, there will be an upward ejection force and the pressure on the lid will increase (which is what usually knocks the cork out of the champagne). However, it is obviously not enough to increase the pressure enough to break the cork since there is more pressure at the bottom anyway and the cork can withstand it.
тогда не взорветься. Потому что на дно давление было максимальное, а на крышку гораздо меньше. В момент всплытия будет действовать выталкивающая сила, направленная вверх и давление на крышку увеличится (что обычно и выбивает пробку из шампанского). Но этой силы явно не хватит чтобы увеличить давление настолько, чтобы разрушить бочку т.к. на дно давление все равно больше и бочка выдерживает
According to the problem, the barrel is under critical pressure as long as the bubble is at the bottom of the barrel. Any increase in pressure by an infinitesimal amount will cause the barrel to collapse.
Question: Will the pressure in the system increase from one state (the ball at the bottom) to another (the ball at the top)?
Сергей, ты совершенно не прав!
Самолёт взлетит по той простой причине, что отталкивается он своими турбинами (пропеллером) от воздуха, который не имеет никакого отношения к дорожке. Понятно, что в этих условиях дорожка будет раскручивать колёса самолёта до любой бесконечно большой скорости, но самолёту пофиг, он этого даже не заметит - медлено и верно (как ни в чём не бывало) он разгонится опираясь на воздух относительно воздуха и взмоет в воздух.
It would have been if it had already been in the air. It would have been if there had been an air cushion instead of a landing gear. But belt-chassis-airplane is one system. And as long as the plane is on the ground - it's not like that at all :o)