City: I Run A Fake University

Chapter 140: The Birth of the Earthquake Generator

Scientist Yuri walked into the classroom and wrote down the topic of today's class on the blackboard—the making of an earthquake generator (iii)

After writing the title, Yuri asked lightly: "First, let me ask a few questions."

"What would you think of on my subject?"

The students looked at it, lost in thought. After a while, a young Huaxia's face whispered, "Tesla."

Hearing this answer, Yuri looked for the student in the classroom, and motioned him to continue talking with his eyes.

Young students stood up under Yuri's encouragement: When I wrote about the earthquake generator, it reminded me of the famous Tesla experiment.

"Well, keep talking." Yuri said to the Huaxia student in front of him.

"In 1935, Tesla drilled a deep well in his laboratory, and put a steel casing in the well. Then, he plugged the wellhead and input vibrations of different frequencies into the well. Amazingly, at a specific frequency Suddenly, the ground will vibrate strongly and cause the surrounding houses to collapse. This kind of super transmission effect of small input and strong output is called the Tesla effect." Huaxia students said.

"About what you said, do you have any opinions, or what do you think of its principles?" Yuri asked with interest.

"I think it should be related to the theory of relativity, 907E=MC2 bottom energy equation."

When the student said this point of view, the others seemed to realize something, and the eyes of the faces in the classroom lit up. Yuri looked directly at the young face of the student, quietly waiting for his next words.

"These two points tell us...I personally think...it should mean that speed, quality and time are related." The student replied with some confidence.

"What's your name?" Yuri looked at Huaxia students and asked gently.

"My name is Wang Miao." The student replied with some embarrassment.

Yuri looked the student in front of him up and down, his eyes gradually showed appreciation, and he muttered: "Well, Wang Miao, not bad, not bad." Then Brick said to everyone: "This classmate Wang Miao He has a wide range of knowledge and is good at thinking. Everyone should learn from him.

Then Yuri clapped his head and clapped.

The Huaxia student touched his head shyly. "It's okay, I just found some information and accidentally saw it. At that time, some critics said that Tesla used an artificially induced earthquake to almost level New York. I thought it was very interesting, so I paid more attention." (bjca )

Yuri smiled and pointed to the ppt: "Okay, let's enter the classroom next."

Through Wang Miao's reminder, I think everyone has some understanding of Tesla's earthquake machine. However, not everyone can understand how the earthquake machine --- it should be called the amplitude stepper to be precise. "

Such an opening remark aroused the students' interest in challenging. After all, they are all the best in each country, and they actually said that they may not understand? Who is this underestimating?

All the students here cheered up to listen to the teacher's course.

"Actually, from a certain point of view, the working principle of the earthquake generator is super simple. There is no need for complicated formulas or mysterious comprehension. You just need to follow my train of thought and simply think about it in your head to understand it." Yuri was very pleased. easy to say?

After a pause, he added: Of course, having said that, this requires basic knowledge. And I believe that you all have these basic knowledge, otherwise you would not come here. So the earthquake generator is not as scary and difficult to make as you think. All you need is a certain understanding of waves and vibrations.

"Then skip the nonsense and let's go directly to the topic. According to the theory of relativity, the E=MC2 mass-energy equation tells us that speed, mass and time are related. Then, how to determine the speed of a pendulum?"

Yuri didn't give them time to think. With a wave of his hand, the ppt jumped to an interface, and there were three pictures on the interface [the pictures are pendulums in different states.

Yuri looked at the courseware and said: If deduced by the theory of relativity, the speed of the pendulum is actually zero. Because the pendulum always returns to its original position.

"As shown in the figure, the movement process of the pendulum is from Figure 1 to Figure 2, and then to Figure 3. Then it moves in the opposite direction."

"Although there are only three simple steps, the process is completely different. Come and ask me random roll calls, and the tall handsome guy in the last row will talk about the exercise process." Yuri pointed to a dozing foreign man in the back row.

The man stood up, looked at the picture and thought for a moment, and then explained: "Pictures 1 to 2 are actually the process from stillness to motion. In picture 1, the pendulum is pulled from rest by gravity and falls. Constrained by the cycloid And draw an arc. Gravity accelerates the pendulum once, so that the pendulum changes from rest to motion. But this process changes from Figure 2, and this process becomes from motion to rest.”

"Okay, please sit down. There is nothing wrong with the answer. What I want to ask is why it is from motion to stillness?" Yuri said.

"It's because the clock pendulum uses its own energy to overcome the gravitational force and moves obliquely from above." Wang Miao blurted out.

Yuri nodded in satisfaction, and gave Wang Miao an appreciative look.

Therefore, we can find from the process of Figure 1 to Figure 2 that the object moves from top to bottom, but the speed of the object increases. At this point the object loses potential energy but gains velocity. In the process from Figure 2 to Figure 3, the object relies on its own speed to overcome the gravitational force and obtain potential energy. Therefore, the energy of the object itself is conserved in the above two processes. "

Some students below seemed a little bored and disdainful of what Yuri said. In their view, the repetition of these theories is to despise their IQ, which is very childish.

Yuri saw all this in his eyes and kept it in his heart.

From Yuri's point of view, these self-righteous students are totally wrong. A solid foundation is always the most important thing, which is why they come here.

Yuri ignored their existence, and continued to say dryly: "From the above content, we can see that if the air resistance and other influences are ignored, the energy of the pendulum motion is conserved, and the pendulum can move forever. However, the pendulum motion is a A dynamic balance.

This dynamic balance will have energy trends and nodes. If you stand in the path where the energy is going, then you will have the full impact of the energy. "

Yuri concluded by saying, "If you are equal in strength to the energy, then the energy cancels out. If your energy is in the opposite path of the pendulum, and your energy is weaker, the pendulum will change your trajectory by releasing energy. After that, your trajectory is changed by the pendulum, which loses some of its energy.

After finishing speaking, Yuri glanced around the class, and then came his test.

After the theory is finished, you should learn to infer other cases from one instance. "Yuri took out the semi-finished earthquake generator he made and showed it to everyone.