Crossing the river by a bamboo through this scientific know-how

Seemed only appear in the film, but the story only man to cross the river by two bamboo pole caused netizens amazed. Great thing is you can do that if you know the tricks.

Crossing the river by bamboo

A monk in the 5th century, Bodhidharma (He is considered evangelist and founder of Zen and martial arts to China) is said to have reached the river on a grass just wipe.

Nature seemed fictional story that could appear soon in real life, when a man named Fang Shuyun 51 years old in the city of Hangzhou, Zhejiang Province, China could make people amazed .

Still unable to cross the river by a reeds but only use 2 bamboo pole also able to overcome major rivers.

Why only two bamboopole can also cross the river?

To be able to answer this question, we need to understand the conditions of sinking - floating in the Archimedes thrust

So we can understand that the objects will emerge when "specific weight synthetic" smaller its own volume of water.

A bamboo pole with a specific weight (0.4 kg / dm3) is less than the density of water (1 kg / dm3). So naturally, when dropping them on the water, they easily stand for Archimedes thrust in this case won gravity of bamboo poles.

On the other hand, for humans, because the density of people (~ 1.1g / cm3) slightly larger than the density of water (1 g / cm3), the Archimedes thrust just enough ... pushing the top stand up underwater ignored.

So this is why we sunk when falling water, so consider us "people - bamboo poles," why can float on water. As mentioned above, the objects will emerge when "synthetic specific weight" of it (lift) is less than its own weight.

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That's why drop a lump of iron, it went down, but it was safe, but the shape of a sheet of paper (still the same amount), it re-emerged. We can see the emergence of intuitive like a boat made of iron.

Itself made of iron (with specific weight) greater than a lot of water and also the freighter people, things more dense than water. But it's easy to float on water.

This happens because the formula Archimedes thrust (F = dV) we find it also depends object displaces volume in the liquid (V). More objects occupy a large volume (V), there will be big lift.

The problem lies in the volume of that material into the liquid displaces rather than the weight of the animal. It was bigger boats but the volume fraction of space in major countries (due to the hollow structure contains air at the bottom of the boat) should be able to stand.

Moreover, to float without sinking then we also have to consider adding a human factor that is balanced. If the boat is not symmetrical structure to be able to tilt the balance when the water will overflow into the cabin and then it sank.

Back to the original question, the human body in the water will sink (if not moving, floating center of the body B is located about G's chest and body focus points will be located around the waist , only the first part can stand!

But by standing on a bamboo pole, the focus and attention will be vertical well (but wise horizontally and makes us sank as the figure), while the volume occupied bamboo poles will be enough to lift them we (should bamboo poles must be long enough).

Fang Shuyun said that the bamboo must be at least 4 meters to be sufficient buoyancy and those who want to cross the river to take advantage of wind and currents to trip even more convenient.

To be able to balance and move, we need to use a bamboo pole, when holding it in focus, the focus of the people, will be a vertical bamboo poles and passing through the base area helps us not tilted and fell.