I really don't want to lie down and win

"Professor Xie is calling you!"

"Wake up!"

Suddenly hearing someone calling him, Xu Mang opened his confused eyes, and saw a girl in front of him staring at him, and fell into doubt for a moment, did he have any relationship with her?Keke is telling the truth...she looks average, she is not just a little bit worse than Xiaoman.

"what?"

"Who are you?" Xu Mang looked at her curiously, his face full of doubts and incomprehensions about the situation in front of him, but soon he realized that something was wrong, the atmosphere of the whole classroom seemed to have fallen into silence, everyone around look at yourself.

What... what's going on here?

Why do you suddenly care about me so much?Could it be...the identity has been exposed?Glasses!Did you forget your glasses?

Xu Mang hurriedly touched his black-rimmed prescription glasses, but the glasses hung on his face, which was very strange. Although a pair of glasses can't change anything, it did change his temperament, temperament Change... People change with them.

"This classmate!"

"Have you learned physics well?" Professor Xie asked solemnly: "Then solve the problem I mentioned just now. Two identical charged particles with mass m and charge e start to be separated from each other. Far away, one particle is at rest, and the other is moving towards the stationary particle with velocity v and aiming distance p equal to 2ke2mv2."

"Then what is the center-of-mass neutralization angle?" Professor Xie asked, "Please answer."

what?

Particle system dynamics?

I did not write this question.

Xu Mang recalled that when he was writing the dynamics of the particle system, he did not write any questions about the dynamics of the particle system. It is estimated that this topic was written temporarily by himself, but it is indeed a very good question. It involves the translation of scattering particles. Reference frame, and the formula of kinematic equations under the action of inverse square law force.

of course,

This is just one of the solutions. In fact, there are many solutions to this problem. Each solution is different, but the answers are almost the same.

"Oh..."

"I... Did I go to the blackboard to write the process?" Xu Mang asked curiously.

"Correct!"

"Come to the blackboard and write." Professor Xie said seriously: "By the way...if you can't write this question, my basic physics course...you have to retake it. If your process and answers make me very uncomfortable Satisfied, I don’t need to come to my class in the future, I will give you a full score.”

hiss!

What the hell!

Play this big?

Hearing Professor Xie's words, many people in the room gasped and said not to be scared, but it was more of a memory of Xu Mang. He did not hesitate to use his failure to verify a legend in the School of Physics. That is, don't talk back to Professor Xie, it's easy to get overwhelmed and walk around.

Xu Mang got up and walked through the crowd. Under the eyes of welcoming and sending off the heroes, he walked all the way to the blackboard. He silently wrote down Professor Xie's question before, then stood in front of the blackboard, looked at the question in front of him, and thought for a while. Some dazed.

like...

The blackboard is not enough!

"Cough cough!"

"Professor Xie?"

"What if the blackboards are not enough?" Xu Mang asked cautiously, "These four big blackboards are not enough for me to write... What if the writing is broken in the middle?"

Professor Xie frowned, his eyes were full of doubts, and he said seriously: "Impossible! This is a topic I proposed. Let alone four blackboards, two blackboards are enough. Anyway, you can write...write Tell me if you can’t stop, today’s class will not be held, it all depends on how you solve the problem.”

"..."

"Oh!" Xu Mang nodded, and reluctantly picked up the chalk at hand, and wrote down a word for solution, feeling a little twisted, and hurriedly added a colon, feeling more comfortable...

have to say,

I am used to writing theories, and then go back to solve such ordinary topics, I am not used to it.

original,

Everyone was not optimistic about Xu Mang, including this Professor Xie. However, when Xu Mang came up with a calculation process based on the translational reference frame of the scattering particles, Professor Xie realized that things were not as simple as he thought.

Then,

Professor Xie saw a very perfect calculation process of the kinematic equation formula under the action of a very perfect inverse square law force, and couldn't help showing a little surprise, but the surprised expression lasted for a short time, and soon returned to normal, scattering particles in the translational reference system , and the formula of the kinematic equation under the action of the inverse square law force cannot explain any problem.

The real difficulty lies in the back. It is necessary to draw a flat two-dimensional diagram and calculate the following process according to the two-dimensional diagram.

swish swish,

Xu Mang continued to solve the problem, but at a slower pace.

and many more!

When Professor Xie saw Xu Mang wrote a set of relationships, m1 and m2 were the masses m1m2m of the scattered particle and the scattered particle respectively, his expression gradually changed from indifferent to a little panicked, as expected...he saw a particle that Xu Mang imagined group relationship.

设粒子1和2相对于质心平动参考系的速度分别为v1c和v2c，平行且相反，因为m1m2m，v1cv2c，vrv1cv2cv1cv2c2v1c。

This...

This student... is not easy!

Could it be that all the content has been learned in advance?

at the same time,

The students in the audience were a little shocked. They never expected that the contestant who was originally considered to be the bronze rank turned into the king rank, especially the two girls who were sitting in front of Xu Mang.

"he..."

"so amazing!"

"Could this guy be pretending to be a pig and eating a tiger?" The girl who woke up Xu Mang said to her best friend, "Peking University...it's like Crouching Tiger, Hidden Dragon."

"I just said it...the more he looks like he doesn't care, the more likely he is a peerless genius." The girlfriend said with a smile: "Do you still question my words now? He must be a genius...just From that decadent energy, it's not a genius... God doesn't agree."

"cut!"

"I refute!"

"Professor Xu from Fuda is not the kind of person you said." The girl said disdainfully: "Professor Xu is a genius among geniuses, but at the same time he is very, very hardworking. I think... genius and hard work Always hooked up."

at this time,

Xu Mang's problem-solving process was still going on, but it was about to reach the end. However, in just 10 minutes, Xu Mang had conquered everyone present, including Professor Xie who was standing by. He never imagined that there would be such a thing. A student exists.