In the physics competition training class, the lights are bright, Wu Mingqiang is explaining on the podium, and the dynamics part is currently in progress.

Wu Mingqiang spoke very slowly, and his Mandarin was not standard. He did not care whether the students under him understood it or not, and just kept talking about the law of universal gravitation.

In the training class, there were more than 300 students who originally signed up, but after a few weeks, only about 40 were left.

Mathematics requires talent, and physics also requires talent.

At this time, those who stayed in the physics competition training had good talents in physics, and it was normal to get full marks in the physics exam.

Liu Yichen listened very carefully. Although he had all these courseware and had already learned them, he still listened very carefully. If the normal class teaches a level of 5 based on the college entrance examination difficulty, then the difficulty level taught in the training class is 10.

!

For example, in non-inertial reference systems, the physics teacher will briefly explain some of them, such as the inertial force in the translational acceleration reference system, the inertial centrifugal force and apparent weight, and the Coriolis force in the uniform rotational reference system, but these are not even discussed.

But here, they are all explained as important contents of dynamics. As for the fact that you can’t understand what the training teacher said, it’s because you didn’t listen hard, not because the teacher didn’t explain it in detail.

Like the college entrance examination, there are two major parts in the physics competition, one is mechanics and the other is electromagnetism. As for passion and optics, they are relatively minor. Of course, there is another part of the competition that will be different, and that is the content of the physical experiment test.

Thirty-four physics experiments may only test one or two experimental questions, and they are random.

For Liu Yichen and others, this means that it will take them more than a year to learn the entire high school physics knowledge, and it is more difficult and deeper physics knowledge than the college entrance examination. Even if they use college physics, don't be surprised. It's normal.

operate.

During exams, whether it is a normal exam or a college entrance examination, there may be questions that are beyond the outline. But for physics competitions, there are no over-the-top questions that are not beyond the outline. As long as it appears, it is reasonable.

As the training class has reached this stage, students who are still in the training class have a privilege, that is, they can not participate in the normal course assignments. Even if you do other things in the course, the teacher will not care about you.

Because you are in a training class, your learning progress is faster, more difficult, and deeper.

As for most people, they were eliminated early. It was not the teacher who eliminated them, but they themselves eliminated themselves.

It can be said that those who can persist for a month and stay in the training class are all talented masters in the subject and the top students in the subject.

"A disk goes around the disk center o in a clockwise direction and rotates at a uniform angular speed w=4.43rad/s on a fixed horizontal axis perpendicular to the disk surface. The disk radius r=1.00m. There is a horizontal ceiling directly above the disk. Suppose

There are always water droplets being thrown out from all over the edge of the disk. Now it is found that there is only one point on the ceiling with water. Taking the gravity acceleration g=9.80m/s^2, find: (1) The distance between the ceiling and point o, the central axis of the disk

Height; (2) The coordinates of the point with water on the ceiling." Wu Mingqiang wrote a question on the blackboard, and then said: "This is a question I left. I hope the students will do it well.

In the next class, I will randomly select a few students to answer the questions."

Everyone started writing and copying down the questions on the blackboard. As for Wu Mingqiang, he had already left the classroom, which meant that the evening training class was over.

Next, the next class is after New Year's Day, because the New Year's Day holiday officially starts tomorrow, which also means that there is only about a month left in this semester.

Normally, the first semester of each year starts on September 1st and ends on the 16th or 17th day of the following lunar calendar.

This is a habit formed over many years.

The others copied the questions, chatted with each other and left the classroom. Liu Yichen did not leave directly. It was still early. They were anxious to leave because they wanted to go back to the dormitory to prepare their luggage and go home early tomorrow morning or overnight. Liu Yichen was not in a hurry to return.

Home.

Instead, on the draft, I drew a line representing the ceiling, and then drew an x ​​and y coordinate axis below the line. Then, taking the intersection of the x and y axes as o, that is, o as the origin, I drew a circle.

Analysis shows that the place with water on the ceiling is only one point, so this store must be the highest point of all water droplets' motion trajectories, and only water droplets thrown out from the edge of the disk in the second quadrant can reach this highest point, so Liu Yichen is in the circle.

A point p is drawn on, which forms an angle θ with the x-axis.

Immediately after a physics question, a picture was drawn. Where there is a picture, there is mathematics, including the coordinate points in it, which can be represented by the trigonometric function of velocity v and angle.

This question was very difficult. Liu Yichen was immersed in it, sometimes frowning slightly, sometimes relaxing his brows. When Liu Yichen finished the answer, 'pop~' the lights in the classroom went out.

"This question is so difficult, it actually took me more than an hour to solve it!" Liu Yichen muttered to himself. The solution process took up three pages, with a total of 18 equations.

If this kind of question appeared in the college entrance examination, it is estimated that 99% of students would simply give up on this question because it is too difficult.

Even Liu Yichen thought he had mastered it, but it still took him so long to answer it.

In the darkness, Liu Yichen put his pen, scratch paper, and materials into his bag, stretched out, and before he knew it, it was already at this time, and everything was pitch black.

Fortunately, he was in a classroom on the first floor of the comprehensive building. The door would not be locked, otherwise he would have been in trouble. After leaving the classroom and closing the door, Liu Yichen headed towards the dormitory building. However, when Liu Yichen was halfway there, the lights in the dormitory building suddenly turned off.

, Liu Yichen knew that this time he had to shamelessly ask the uncle and aunt in the boarding center to open the door.

However, this kind of thing happens once and twice, and Liu Yichen is already familiar with it, so he won't feel embarrassed. Being thick-skinned is not enough, and being thin-skinned is not enough. As long as you are thick-skinned enough, there is nothing to be embarrassed about.

As for face, how much does it cost per pound!?

"Auntie, please open the door!" Liu Yichen saw his aunt humming and said to the dormitory aunt with a smile.

There are only four people in the dormitory management center, two in their dormitory building, and the other two are in another dormitory building.

"Liu Yichen, studying is important, but you should also pay attention to your health. If you study until so late every day, don't make your body unable to eat and get sick. It's the cold and fever season now. Many students have caught colds and fever recently." The dormitory aunt said and left.

Come out and open the door, letting Liu Yichen in.

"Thank you, Auntie!" Liu Yichen thanked her quickly, and then walked quickly towards the dormitory. He didn't dare to listen to her anymore, otherwise she would start talking about how well-behaved her little daughter was, and how she introduced her to him.

self boasting!
Chapter completed!