[Archive!] Pure mathematics, physics, chemistry, etc.: brain-training problems not related to trade in any way - page 73
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1. Вы участвуете в соревнованиях и обогнали бегуна, занимающего вторую позицию. Какую позицию вы теперь занимаете?
2. Вы обогнали последнего бегуна, на какой позиции вы теперь находитесь?
3.У отца Мэри есть пять дочерей: 1. Чача 2. Чече 3. Чичи 4 Чочо.
Вопрос: Как зовут пятую дочь? Думайте быстро.
1. second
2. by N-1 if N is the number of runners
3. chuchu But I'm not convinced. I can't remember the sequence of the most frequent vowels. And it varies from language to language.
to Mischek,
1. On the second one.
2. The last runner cannot be outrun.
3. Chuchu.
1. вторую
2. на N-1, если N - кол-во бегунов
3. Чучу Но не убежден. Не помню последовательность наиболее частого употребления гласных. Да и для разных языков она разная
It's childish, but many still get caught ))
2.interesting to see how you overtook the last one
3.Mary ))
How was it controlled, was it a glass wheel or something?
The tube was transparent, about 10mm.The magnetic fluid just smeared on the walls (the bugger).
And what, the pressure differential was really preserved?
Save the pressure difference is the main design problem, I can't do it yet, suggest the solution when the time is ripe.
If, for example, you twist it with your hands. And what about the friction, how long would it spin after pushing?
So it should start spinning on its own. We have a wheel radius of 150 mm and a tube diameter of 10 mm. The difference of liquid levels (water) is 50 mm. Total volume is 3929 mm^3 . Weighing about 4g we have a torque of 4g at 150mm.
Это детские,но многие всё равно попадаются ))
2.Интересно посмотреть как Вы обогнали последнего
3.Мэри ))
:)))) Caught, vagabond ))))
ivandurak писал(а) >>
The wheel has a radius of 150 mm and a tube diameter of 10 mm. The difference in liquid (water) levels is 50 mm.The total volume is 3929 mm^3. We have a mass of about 4g . We have a momentum of 4g at 150mm.
The difference in air pressure in the elbows interferes with rotation. The same one that causes the liquid to take an asymmetric position in space.
The laws of conservation still rule. :)
Mischek, одним штрихом сделайте равенство верным - задача некорректна, т.к знаки и цифры имеют разные размеры :)
Задача с Мэри тоже некорректа, т.к. не факт, что у него ещё дети не найдутся.
Well the thread is pretty much doomed to be half-full of accusations of impropriety )xeon, this phenomenon was in Moscow some time ago. Scientists give quite different explanations.
My point of view is that this cloud was formed either on the ring road or on the shore of the lake (pond).
There is no doubt that it is a cloud.
Here, I drew two squares by drawing three lines:
-
Если, например руками крутануть. И как с трением, долго оно после толчка крутится могло?
Так оно само должно начать вращаться .Имеем радиус колеса 150 мм.Диаметр трубки 10 мм . Разницу уровней жидкости ( воды) 50мм .Итого обьем 3929 мм^3. Вес около 4 гр .Имеем момент силы 4 гр на 150 мм .
It doesn't have to do it by itself :), but you can twist it by hand to check the quality of the construction, the same friction.