Rising: Ten Thousand Years Chapter 115: : jump off the building

Li Zhen opened the textbook he had prepared, glanced at it twice, and wrote two words on the blackboard.

'Air resistance'

Seeing these four words, everyone licked their lips excitedly and nervously, staring at Li Zhen scorchingly.

"Air resistance. Who can say what air resistance is?"

Xiao Shengnai raised his hand and stood up: "Mr. Li, when you talked about fluid mechanics, you once talked about resistance. So in reverse, air resistance is similar to the resistance in fluid mechanics?"

Li Zhen asked him to sit down and said: "In detail, air resistance refers to the resistance of air to a moving object, which is caused by the elastic force of the air on the moving object. Compressed, the friction between the surfaces on both sides and the air, and the space behind the tail becoming a partial vacuum, the resistance caused by these effects. When running against the wind, the wind force must be added..."

"So, where can the resistance in the air be intuitively reflected? When it rains, you need to open an umbrella, and when the wind blows, sometimes the umbrella will be blown away. I don't know if you have discovered this principle."

After Li Zhen finished speaking, Liu Jinghong shouted: "Is it true that the larger the area, the greater the resistance against the wind?"

"So to speak."

Li Zhen said again: "There is resistance and power in the air; and aerodynamics is simply how to determine the best balance of these two completely opposite forces at certain times. The actual operation must be combined with environmental factors. The pressure of the air flow is linked. Otherwise, you will not be able to distinguish what is aerodynamics and air resistance..."

"Due to the effect of air resistance when the object moves forward at high speed, the aerodynamic forces in three directions, namely longitudinal, lateral and vertical, are generated around the center of gravity of the object at the same time. Among them, the longitudinal air force is the largest air resistance, about Accounting for more than 80% of the overall air resistance..."

Lin Xiufeng anxiously took notes, he felt that he could not understand at all.

A book from heaven is purely a book from heaven.

Although Li Zhen has tried hard to speak from the shallower to the deeper, he still doesn't understand. I understand the truth, but... I always feel that it is indescribable.

Qin Enze asked: "The reason why birds can fly into the sky is because they have wings. So in reverse, does it mean that the wings of birds flap like a fan, forming a reaction force in the air, Thus gaining lift?"

Li Zhen's eyes brightened: "Yes. Although there are many more complicated things in it, it is indeed the principle."

Qin Enze nodded and sat down, completely absorbed in his thoughts, not knowing what to think about.

Liu Jinghong also suddenly asked: "So, if human beings want to fly into the sky and create a device with wings, can we let those two wings beat the air by gaining power to create The upward lift, the downward reaction lifts off?"

Li Zhen waved his hand: "It's complicated. Your thinking is not wrong, but I said that the principle of birds flying into the sky is extremely complicated. It's not what you think. Humans want to fly into the sky, and You don’t have to stick to the principle of birds. We can do it with other principles. Don’t interrupt my lecture, I will continue.”

“…”

"The study of aerodynamics is divided into two aspects: theory and experiment. The law of energy conservation..."

“…”

After finishing the lecture on physics, Li Zhen had lunch and came to the School of Mathematics.

A group of people in the School of Mathematics looked at Li Zhen with nervousness and fear.

They have recently discovered more and more that this advanced mathematics can really teach people to death.

Throwing out a concept has already driven several people crazy in the after-school research. Everyone was a little terrified, this human thinking is really... too scary.

Why are people's brains so big? Why is it so big?

Isn't mathematics addition, subtraction, multiplication and division? Isn't mathematics the calculation of how much is a catty of pork when Xiao Ming bought two catties of pork and spent 20 yuan?

Mathematics... Why is it not a number at all after learning it. Why have they all become various letters, various formulas, various thinking modes, various concepts...

Going crazy.

"Mr. Li."

Li Zhen nodded: "Okay, let's talk about algebraic functions today."

“…”

"Non-transcendental functions are called algebraic functions. Examples of algebraic functions include polynomial and square root functions. The indefinite integral of a function is a rich source of transcendental functions, such as the logarithmic function from the indefinite integral of the reciprocal function..."

You look at me, I look at you.

Don't understand.

I already know physics.

I already knew about chemistry.

Even the mathematician Hou Qiang was completely dumbfounded at this time.

A girl pushed Hou Qiang, and said in a low voice, "Have you ever heard of a math class where the whole text is full of words, without a single number?"

Hou Qiang smiled wryly: "Aren't you just learning?"

“…”

Li Chen was eloquent in his lectures.

At this time, such a thing happened in Kyushu Physics.

Qin Enze was stunned, sitting in the laboratory and muttering to himself: "Why do human beings fly to the sky? Obviously, it is impossible to use wings to fly to the sky. Master Li said that human beings do not have such muscles , it is impossible to fan the air with the strength of the hands to make itself vacant. And machinery, or steam, is simply not enough to make the device fan the wings.”

"But it will definitely be able to fly into the sky. Absolutely no problem."

"If human beings want to fly into the sky, they only need two forces. The upward lift and the forward power."

Qin Enze murmured, lit his pipe and took a deep puff, his eyes suddenly flashed, and a thunderstorm resounded in his mind~IndoMTL.com~ If the steam engine can replace the forward power, then only need to get upward The lift force can achieve the effect of flying, and the wing structure of birds is not specifically required. The forward power problem doesn't need to be solved now, I have to prove the upward lift..."

Looking at the physics lab, everyone was arguing endlessly, Qin Enze walked out of the physics lab silently with a bong in hand.

The first person to eat crabs, the first person to take risks.

Li Zhen is the first person in Kyushu to propose air resistance, and Qin Enze will be the first person in Kyushu to prove air resistance.

Aerodynamics must combine theory and practice, and proof is indispensable. Crazy Qin Enze is about to prove the existence of air resistance.

When Li Zhen walked out of the School of Mathematics dizzily, the entire Kyushu Academy of Sciences suddenly became a sensation, with screams and cries one after another.

"Qin Enze is going to jump off the building!"

"Master Li, it's too bad, Enze is going to jump off the building!"

"Hurry up, call the doctor. Quickly take the bed sheet and continue."

"Qin Enze can't make mistakes, he is the mainstay of the School of Physics."

"Oh, Enze, why can't you figure it out, why did you jump off the building?"

"Enze, if you can't figure out academic problems, you can think about it slowly. Why commit suicide."

“…”

The entire Kyushu Academy of Sciences was shocked, and everyone rushed out to the tallest teaching building. A total of ten floors, more than thirty meters high.

Li Zhen's complexion changed wildly, he dropped the book and ran away.

When he arrived at the highest teaching building, he saw Qin Enze closed his eyes on the edge of the rooftop, waiting for something. He was muttering something.

"Benevolence!"

Li Zhen roared: "Come down!"