[Archive!] Pure mathematics, physics, chemistry, etc.: brain-training problems not related to trade in any way - page 574
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Bears, what's he saying? I don't study English.
I don't know either, but it's obvious. It's like the weight went down after the promotion.
At first he can barely lift with two hands, but he can lift with one hand. That doesn't make any sense.
The iron, as I understand it, weighs 40 kilograms, i.e. around 0.45*40 = 18 kilograms. A man of that age (plus a professor) and that build would not be able to do it purely by physical force of arms. These are the wonders of a gyroscope.
P.S. The gyro flywheel spun up to 2500 rpm. The main law of the gyroscope is conservation of momentum (i.e. torque) at all costs. Momentum, unlike, say, energy of a body, is a vector quantity. Preservation of momentum is not only preservation of its magnitude (roughly speaking, the magnitude of rotational motion), but also of its direction in space.
The flywheel there is obviously heavy, 15 kilos. And now it's spinning at 150 rpm. It's a very solid and highly inertial thing. As soon as someone tries not even to slow the flywheel down, but simply to change the direction of its rotation vector in space, the very inertial flywheel will do everything to keep the same rotation vector. And it will do so in a very unusual way.
In this case, the professor not only lifted it above the floor, but also changed the vector of the flywheel rotation axis from vertical to oblique. The gyro flywheel immediately added its reaction, lifting itself upwards - and perhaps still spinning the whole structure in the other direction.
I have not studied gyroscope theory, I know about its wonders very superficially.
Mathemat:
... The gyro flywheel immediately added its reaction, lifting itself upwards ...
This is an experiment with a spinning wheel. A rather large wheel - 13 inches in diameter, mounted by means of a bearing on an axle, three feet long.
I'm going to lift it "like this", circle it and lift it with one hand. First of all, let me show you how much it weighs. Blah, blah, blah... about forty pounds, blah, blah, blah, blah.
Now, we'll spin it up to two and a half thousand revolutions per minute, and I'll show you how I lift it up five feet in three seconds with one hand, making a big circle with it.
Vzhzhzhzhzhzhzhzhzhzhz...... )))
Now I hold its weight with my left hand and here (meaning my right hand) I just hold the direction.
I lift the wheel five feet. All I do is follow with my hand where the wheel has decided to move itself.
Now the question arises as to how to stop the wheel. This is the very speed that supplies the wheel with the energy that allows me to lift the wheel five feet into the air.
Did you know that when the wheel describes a big circle, there is no centrifugal force pulling my hand to the side.
Let's do it again, the forty-pound wheel has already spun. This is not some kind of trick, this is a scientific fact.
Look again carefully.
>This is an experiment with a spinning wheel. A rather large wheel - 13 inches in diameter, mounted by means of a bearing on an axle, three feet long.
I'm going to lift it "like this", circle it and lift it with one hand. First of all, let me show you how much it weighs. Blah, blah, blah... about forty pounds, blah, blah, blah, blah.
Now, we'll spin it up to two and a half thousand revolutions per minute, and I'll show you how I lift it up five feet in three seconds with one hand, making a big circle with it.
Vzhzhzhzhzhzhzhzhzhzhz...... )))
Now I hold its weight with my left hand and here (meaning my right hand) I just hold the direction.
I lift the wheel five feet. All I do is follow with my hand where the wheel has decided to move itself.
Now the question arises as to how to stop the wheel. This is the very speed that supplies the wheel with the energy that allows me to lift the wheel five feet into the air.
Did you know that when the wheel describes a big circle, there is no centrifugal force pulling my hand to the side.
Let's do it again, the forty-pound wheel has already spun. This is not some kind of trick, this is a scientific fact.
Look again carefully.
You have three "blahs." It's a hidden advertisement for you know what. It's categorically forbidden, Andrei. Categorically.
You have three "blahs." It's a hidden advertisement for you know what. It's categorically forbidden, Andrei. Categorically.
))))