Short video spoiler history: The beginning of modern warfare

Chapter 110 Electromagnetic Catapult
Tang Dynasty, Chang'an City.

Humanity as a whole seems to have never had to face the threat of this kind of "natural enemy". Most of the threats come from within humanity, such as foreign invasions, oppression of the common people by powerful families, etc.

The example of tree frogs seems to bring everyone back to an era even more ancient than slash-and-burn agriculture. According to natural selection, the habits and characteristics evolved by all organisms have played an extremely important role in each environmental change.

If radiation has been everywhere on Earth since ancient times, then black-skinned tree frogs may account for the majority.

"Everything is controlled by genes, and only after being screened by the natural environment does it present the effects we see today." Fang Xuanling concluded. This set of theories unravels the reality and reveals the truth, which makes everyone tremble slightly.

Unlike Newton's third law which describes the laws of the world, the theory of evolution describes the evolutionary path of life on Earth, revealing issues that few people in ancient and modern times have thought about.

"What if there were no black tree frogs in the first place? Did the green tree frogs die out after the nuclear leak? Did the mutation mentioned in theory give rise to black tree frogs?"

Someone had a sudden idea because he saw the discussion about evolution in the comment section, which talked about gene mutation.

Li Shimin was also thinking. When it came to biology, everyone was equally knowledgeable, so he was also very interested in this question. After thinking for a while, he said, "The evolution mentioned in the comments is often measured in millions of years. Maybe it really will happen in such a long time?"

The others also nodded. Logically speaking, if the tree frogs had not become extinct at the beginning, then the surviving tree frogs would definitely evolve in a direction that was beneficial to survival. It was really difficult to explain this matter clearly.

[HR: Why did you choose to interview at our company? Me: Didn’t you call me to come? ]

[HR: If you are asked to work overtime during the legal holidays, would you be willing to do so? Me: Uh. Then if I slack off during work, would you be able to accept that?]

[HR: What is your expected salary? Me: 12K before tax]

[HR: I have a basic understanding of your situation. Can you go back and wait for notification? ]

[Me: Wait a minute, I have a question to ask. Why did you choose me for the interview? ]

[HR: Because your resume is more suitable for the position in our company]

[Me: What advantages does the company have to attract job seekers? ]

[HR: Shouldn't I be the one asking you this question? ]

[Me: What? You don’t even know the advantages of your own company? Then why did the previous employee in this position leave? ]

[HR: Because they have better plans and want to further improve themselves. ]

[Me: That means your company is too bad to retain employees. What is the salary for this position? ]

[HR: If you do a good job, you can get 6k, basic salary 3k, performance bonus 1.5k, commission 1.5k]

[Me: So that's 3k? Okay, I've learned about the company's basic situation. Go back and wait for notification.]

[HR: When can you give me a reply? ]

【Me: Usually 3 working days, depending on my mood. 】

Jinling City, in front of Fengtian Palace.

Judging from the comments that flashed by, people in later generations had quite a few complaints about this kind of "recruitment" scene.

Everyone in the Science Department put themselves in the interview situation and couldn't help but feel very awkward about this "interview" environment, as there were many words spoken that were just for the sake of making trouble.

Questions like what was said in the barrage: "Your girlfriend is sick and needs to go to the hospital immediately, but the company asks you to deliver a contract to a client. What should you do?"

Just listening to it once makes people feel a little uncomfortable and frown. Even though in everyone's mind, His Majesty is a ungrateful emperor in history, he didn't use these questions to deliberately disgust people.

What's more, it's an employment relationship, you just do the work for money.

Everyone is very familiar with this kind of situation, where people act pretentiously and use chicken feathers as a token of authority.

But everything she did was in compliance with procedures, which made people helpless.

However, after asking these few rhetorical questions and seeing the attitude of the "people" in the sky change from arrogance to speechlessness and twitching faces, for some reason everyone just felt inexplicably comfortable.

"I got it." In the Science Department, Du Ping chuckled, and smiles also appeared on the faces of others. What could be more comfortable than immediate rewards?

Zhu Yuanzhang looked relieved. He wanted to know more about what the employees of this "company" mainly did on a daily basis.
For example, in Jinling City, generally restaurants, inns, pawnshops, pawnshops, blacksmith shops, etc. recruited servants, errand runners, and apprentices, but now places like electrical appliance stores are also recruiting people.

Even so, many people living in Jinling City were engaged in small businesses of their own. Some men made a living by doing odd jobs for others, and some women made a living by washing clothes for others.

Compared with today, the so-called companies in later generations must have other jobs besides the above-mentioned jobs. What Zhu Yuanzhang wanted to see were these jobs and what they were mainly done on a daily basis.

These jobs seem to be quite mysterious. There are not many videos that mention these contents in the sky curtain. For example, in the last video that mentioned business war, some young people were just sitting there, with stacks of papers on the desk, and an object that could present the contents of the sky curtain.
[As we all know, when a wire is wound into a loop and current is passed through it, a magnetic field will be generated around it. If an iron screw is placed in the middle of the coil, it will indeed temporarily possess the characteristics of a permanent magnet. This type of permanent magnet has a characteristic that there is a magnetic field only when there is electricity. Once the electricity is disconnected, the magnetic field disappears immediately.]

[Then bring a piece of iron close to it. The magnetic field generated by the coil will attract the iron sheet to move toward the coil. But when the iron sheet rushes to the far right due to inertia, it will be pulled back by the magnetic force and stop at the center of the coil.]

[If we can control the iron sheet to move to the center of the coil, that is, cut off the current when the iron sheet has the highest speed, the magnetic field generated by the coil will disappear instantly. In the absence of magnetic field constraints, the iron sheet will fly out by inertia]

[In the process of the iron sheet moving, we learned the physics knowledge in junior high school, namely Newton's second and first laws]

[Of course, this process happens in an instant and cannot be controlled manually, so some electronic equipment is needed to help]

[For example, there is a magnetic sensor called the Hall effect, which can detect the position and movement of nearby magnetic objects, and then send the sensed information to an external control board as a 0 or 1 signal. The control board will command another auxiliary device, the transistor, to turn on or off the current in the coil.]

[Let's practice it by installing the coil on an aluminum slide rail, and then choose a metal that can be attracted by magnets to place on the rail to act as a magnetic shovel. The Hall magnetic sensor is placed behind the coil to detect the movement position of the magnetic shovel.]

[It will send a signal to this control panel, and the panel controls the transistor on the other side. The kinetic energy for starting comes from this group of supercapacitors. You can also think of it as a super battery. It uses an electric field to store charge and can release a large amount of current in an instant, which is something that batteries cannot do.]

[The start switch energizes the two sets of coils, and the metal shell in the guide rail instantly moves forward and flies out]

Jinling City, in front of Fengtian Palace.

People in the science department had already started copying. Sun Chuanshi solemnly wrote the formula F=ma on the paper. "This is the famous Newton's three laws. Today I finally see the whole picture." Sun Chuanshi was full of praise. Everyone had known Newton's third law for a long time. It took a long time to know these two laws.

"I didn't expect that these one or two laws are still so simple." Everyone couldn't help but be surprised.

"What is Tianmu doing?"

"Electronic crossbow?" Zhu Yuanzhang frowned and thought, no, this is a universal launching device. It is too wasteful to use it to launch crossbows. It's like a beggar feeling the beauty of the emperor working with a golden hoe.

"It doesn't look very powerful at this speed?" Ji'an Marquis Lu Zhongheng frowned, trying to hold back a laugh in his heart. It's so weak that it can't even fly more than five steps. What use can it be?

Some other generals didn't say anything, but they shook their heads in their hearts with faint smiles on their faces. If the speed is not improved, let alone crossbows, it would be no better than a toy for children.

Zhu Yuanzhang looked up and down at the generals, shook his head and ignored these generals who had only muscles but no brains.

Hu Weiyong, Liu Ji and others smiled, knowing that the matter was not that simple. People in later generations knew much more than we do. If it was just this extent, it would not be embarrassing to publish it.

"What are the principles of this magnetic sensor, control board and transistor?" Zhu Biao asked with a frown. In his opinion, speed is not a problem at all. Newton's second law states that the acceleration of an object is directly proportional to the magnitude of the force.

If accelerating once doesn't work, then try twice, three times, four times. It has been said many times in the comments that physics is all about making bricks fly with great force. Steam engines, airplanes taking off, rockets launching, etc. are all used in this way.

Sun Chuanshi and others shook their heads and said they didn't know, because Tianmu didn't mention this.
There is not even any idea, and the technical accumulation is far from enough.

In fact, almost all knowledge is learned from the sky, and only a few are explored by ourselves within this framework.

Zhu Yuanzhang also knew this situation. Things like technology require time to accumulate.

[This speed is too slow. We can increase the distance between the electromagnet and the iron block and increase the number of coils along the middle of the guide rail.]

[In this way, the iron block is always pulled forward by the nearby magnetic field, and it is gradually accelerated every time it passes through a coil. A magnetic sensor and a super switch are installed between each set of coils.]

[The transistor turns on the power supply and passes current through the coil]

[Hmm, you didn't see it clearly, put a sausage in front of the magnetic sheath to slow him down, here we go]

[You still can't see it clearly, right? Let's watch it again in slow motion.]

[It is said that the electromagnetic guns and catapults used to assist aircraft on aircraft carriers should also use this electromagnetic power. We don't have a real aircraft, but we do have a model glider.]

[If we attach it to a moving iron block to speed it up, can it fly like a catapult launch from an aircraft carrier?]

In front of Fengtian Hall.

The faces of several generals who had just spoken rudely suddenly changed. At the beginning when there was only one coil, it was indeed very soft. How could they have known that the method of acceleration was so simple?
When 6-7 coils were added, they disappeared in a flash. Even with the addition of sausage as a barrier, the sausage was easily cut in half. This was when the iron sheet served as a support for a load and was not sharp itself.

If the coil is expanded further according to the law
Lawrence Lu and others couldn't help but regret their own recklessness, and at the same time frowned and thought, I didn't show a sneering expression just now, right?
Hu Weiyong laughed in his heart, but seeing that the emperor had no expression on his face, he didn't know what to say.

Zhu Biao was not surprised to hear that Tianmu used the same method to accelerate. Looking at the formula F=ma with the ink still wet on the paper, he felt no wavering.

"These three laws are truly the ultimate simplicity!" Liu Ji exclaimed in admiration. These three laws are less than a hundred words each, yet they encompass the corresponding phenomena in life.

By knowing the weight of an object, the electromagnetic acceleration principle can accurately control the launch speed of the object. It has both great force like a flying brick and the dexterity and precision like needlework.

This second law is exactly the same as in daily life. Take pushing a cart as an example. If you have more strength, the cart will be pushed faster, and if you have less strength, the cart will be pushed slower.

The same amount of force will have different effects on an empty cart and a cart loaded with goods.

Even old farmers in the countryside can explain this principle, but no one has ever expressed it in a formula. Of course, this is also related to the fact that there is no corresponding standard unit to measure strength.

Tang Dynasty, Chang'an City.

In the sky, even in slow motion, the gliding model plane still soars into the sky like an arrow.

I didn’t expect that such high-end technology has such a simple principle. However, as the comments said, the principles are very simple, and the process, materials, etc. are the difficulties of the technology.

Li Shimin was itching to get it. This control system was what the court needed. Otherwise, he would have to ask someone else to do this, and the effect would naturally be predictable.

However, Tianmu has never mentioned these contents, especially this controller, which may be related to the communication of the hotel robot scene.

"Can you build an electromagnetic cannon high-speed train that can push me from Shanxi to Shandong with one shot [covering face]"

"The person is floating in front, and the soul is chasing behind, right [狗头]"

"It should be fine, but you'd better come to Shandong in advance and choose a cemetery. I guess you'll be buried right away after this one!"

Is this a leak?

"Everyone who has been to high school knows the principles of making an atomic bomb, but few countries can make one now."

"Foreigners knew the principle earlier. For example, there are a lot of drawings of the principle of making atomic bombs on the Internet, but I haven't seen any country being able to make it."

"I got it. I'll write 'I'm proficient in electromagnetic catapults' on my resume [dog head]"

Li Shimin felt helpless when he saw the debate in the comment section. These things were completely open to the public in later generations. Many countries were unable to produce them because of the materials, technology, etc.

That sounds pretty frustrating.

However, he is not the kind of person who gives up when faced with difficulties. He has survived the difficult time of the siege of Luoyang. What are these difficulties now? The worst that can happen is that he can just work his way through them slowly.

It's not like I'm losing my hair...

In the Science Department, everyone felt their scalps tingling...

(End of this chapter)