Learning Demon Cultivation System

Unexpectedly, this long-haired monster is quite easy to deal with.

It's just a bit too casual, I didn't understand the basic textbooks, I didn't bring a calculator, and I fell asleep.

But on the other hand, if you can enter the semi-finals at will, you can be considered a talented person.

Li Zheng then picked up the calculator and shook it: "The rematch requires a lot of calculations, so you should bring a calculator."

"Ah, is it?"

"Well, it can save a lot of time." Li Zheng pouted at the podium, "If you're embarrassed, I'll help you raise your hand and say, there should be several spare calculators provided in each examination room."

The long-haired monster waved his hands again and again, and his face turned red again: "It's okay, it's okay...no need..."

"The exam is very important. Why are you so shy?" Li Zheng leaned over and handed over his calculator, "Use mine, I'll get it."

"Don't!" The long-haired monster was so frightened that he hugged the table and rubbed against the side, "I really don't need it... I can do my mental arithmetic."

"Huh?" Li Zheng couldn't help but laugh, "This is the rematch of the physical competition, mental arithmetic?"

"It's okay, I can calculate quickly." The long-haired monster scratched his head, pushed Li Zheng's hand and said, "Thank you."

"Hey." Li Zheng had no choice but to shake his head, and took back the calculator, "Looking at you, you should be in the first year of high school, right? It doesn't matter if you fail this time, learn your lesson, and remember to prepare well next year."

The long-haired monster was stunned for a moment, then covered his face with a smile, and nodded silly: "Okay, okay, I see."

"Damn..." Li Zheng was rather uncomfortable, "Can you stop ending with 'la'..."

The long-haired monster turned its head and asked stupidly, "What's the matter?"

"Forget it... as long as you are happy..."

"That's fine." The long-haired monster laughed again.

"It's enough……"

The voice of "Sun Xiubin" came suddenly: "Haven't you two talked enough?"

The two hurriedly shut up.

Only then did Sun Xiubin point to the blackboard and said: "Finally, let me reiterate that the exam time is from 320:[-] to [-]:[-], with a total score of [-] points. When the bell rings at the end, whoever writes another word will be punished as a violation."

Everyone stared and listened, not daring to speak.

After everything was arranged, the bell rang, and the examination papers were issued.

Li Zheng had been through the battlefield for a long time, and when he got the test paper, he no longer felt as excited as before.

All over the body, there is only one word——

stable.

Don't think too much about grades and things like that.

If possible, try not to think about Lin Yujing's situation in answering the question. It's very difficult, so I can only try my best.

Just like doing the usual questions, just do it one by one like water.

Li Zheng swept to the first question.

As expected of the rematch, the first question became more difficult.

It's about a station wagon with a small round table.

There are three rods at the bottom of the small round table as supports, like a camera tripod.

And now there is a cup of tea in the middle of the table.

In order to make the tea water as much as possible and stable, how high should it be filled.

This is a very common process in life, and it is probably enough.

But if it is discussed from a physical point of view, it is a long and complicated calculation process.

In the simplest terms, it is to make the center of gravity of the water cup as low as possible.

After determining this goal.

This question has nothing to do with physics.

Move into analytical geometry and calculus.

Make another limit.

Combine the equations.

Remove negative solutions.

Hey, can't the answer come out just by doing random calculations——

h=m/ρπ2【{（1+4π/5·ρr2H/m）^1/2}-1】

Concise and clear, basically no calculations, just a hot hand.

The second question, the villain pushes the cart.

It's just that this time it's an agricultural flatbed, the kind with two wheels and two poles.

That is, calculus or something is needed when it is calculated.

There are also some simple moments, rigid body mechanics, and energy conservation problems.

Just a little more attention to a bunch of [-]D collision problems.

After breaking these apart.

What is left in front of me is still a mathematical geometry problem.

The Wu Jing is well-deserved of its reputation, and it really is a calculus competition for middle school students.

After Li Zheng wrote down the extremely long answer, he immediately looked at the next table.

The long-haired monster was staring at the paper in a daze, his eyes were cute.

Hey, you're still too young.

Come home and learn calculus well.

Chapter 230 Back to the Origin

Exams are always relative.

The same test paper, viewed from the perspective of different people, feels very different.

For example, Li Zheng, after doing the first two mechanics problems, his biggest feeling is that this is a "calculus competition for middle school students".

This can't be helped, because the problems of mechanics are too classic, and it is difficult to make any breakthroughs in concepts and thinking, so I have to do things in mathematics.

But in Shi Yang's eyes, it was another world.

First of all, it has been 20 minutes since the exam started, and he hasn't read the second question yet.

Because of the question of the first question "Placing teacups on the table", he really couldn't figure it out——

[In order to make the tea cup hold as much tea as possible and keep it stable enough, what is the optimal height of the tea in the cup? 】

What is this Nima asking?

What as much as possible and remains stable enough?

Is the wording of physics so imprecise?

How about trying to solve problems with chemistry?

Filled up and frozen into icicles? =+-֏

It is no wonder that Shi Yang burst out with these wonderful ideas.

It is mainly the grandson of the person who wrote the question.

In fact, what this question asks is [to make the center of gravity of the teacup the lowest, what is the height of the tea in the cup. 】

If you ask this question, there is a high probability that Shi Yang can still score some points.

But if you use the description of "as much as possible and keep it stable enough", people who are not prepared enough may not understand it.

So, after more than 20 minutes, Shi Yang had no choice but to look at the second question about the villain pushing a cart.

Haha I will.

Shi Yang thought so in his heart.

He also really quickly listed a lot of mechanical formulas, ready to flex his muscles.

But soon, he was baptized by the force analysis and crash analysis of the flatbed truck.

It's like someone asking you, can you walk?

Of course you will.

Then that person changed into an old physics competition questioner, sending questions with a smiley face.

"Yes? It will be easy."

"Assume your weight is M, the calf length is L1, the thigh length is L2, and the step length is L3..."

"Please calculate—"

"1: Every step you take, the maximum pressure on the knee joint and ankle joint."

"2: For each step, the maximum angle between the two thighs."

"3: Your left foot sprained suddenly, causing the left foot's contact time and pressure to become 1/5 of the normal state. In this case, please recalculate the first two questions."

If something like this happened on the street.

This old questioner should be beaten up.

Unfortunately, this is an examination room.

And Shi Yang, even the king of Huajing, can only sigh in awe when faced with such a situation.

Of course, it wasn't just Shi Yang who was looking forward and sighing.

Even if old things are competing for life, they will probably be at a loss when faced with this terrifying second question.

This kind of question feels like it's just to raise the bar. If the paper is too simple, you must add a question that no one can solve.

And even if you can solve it, this amount of calculation is enough for you to do for half an hour.

Therefore, the second question that Li Zheng worked out with a lot of thought has been regarded as an extremely difficult problem in the eyes of most people. After writing down a few formulas and ideas, he gave up and ran to the third question.

This third question, the opening question is very eye-catching——

[The simplified model of an electromagnetic rail gun is shown in the figure...]

Seeing this, half of the people thought of "Sister Pao", and the other half thought of "Big seat".

There are also people who think of both.

These people, because they think too much, interfere with the thinking of the exam, and usually die miserably.

If you study this electromagnetic gun carefully, you will find that it is very similar to the questions in the 32nd semi-finals. For those who have mastered the real questions in previous years, it is equivalent to giving points.

For those who have never done it, just study the super electromagnetic gun in a down-to-earth manner.

The fourth question, the vibration question, is slightly less difficult, but it is a brand new question without a template, and it belongs to the kind of question that can be solved with a solid foundation.

The fifth question, the optics question, is probably the easiest question in the whole volume.

But calculus is still required, and optical problems must be mathematical geometry problems.

Those who can do this will probably have some understanding.

Although there is still debate about who is better in physics or mathematics.

But the person who asked the question had a very clear attitude:

Mathematics is my father, if you don't know calculus, please go home.

The sixth question, the topic of relativity, discusses a large number of flying pions in cosmic rays.

The real old competition students don't panic at all when they see this kind of thing.

According to experience, things that look very deep and mysterious are often very superficial. As long as you understand it, it is actually easy to calculate.