Xueba, I beg you to go and escort him quickly!

A big wave has been driven away!

But there are so many domestic universities, countless, who knows which one it will be tomorrow?

After all, with the passage of time, although Xu Heng's enthusiasm seemed to disappear on the surface, the people from the university's admissions office had just begun to act.

Many universities are not fighting the battle of uncertainty.

Like Peking University, they will learn everything about Xu Heng and make all preparations before making a move.

Not only come to school, it is very likely to go directly to the house.

……

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Chapter 86

The week is fleeting.

Especially in Xu Heng's physics class, there were other teachers who were impressed by Xu Heng and began to improve their teaching methods.

Many students fell in love with class more and more.

To be more precise, it is because I love to show off and want to be recognized, so I look forward to class more and more.

"Since I was a child, I have never been so excited!"

"It's the first time I look forward to math class so much!"

"That's not right! Me too! The math teacher asked us to prepare the questions and give the answers ourselves! We will still talk about it in class!"

"I'm going to ask the seniors of the third year!"

"Ask the seniors, why don't you ask Xu Heng?"

"I can't get in line!"

"Ahahaha-, there is nothing wrong with your words!"

"..."

It is precisely because of this that the enthusiasm of the students has become more and more high-up.

Around after school, Yue Pingting was still discussing with Xu Heng.

It was just sitting in the head teacher's car, and the discussion was very quiet.

It was still Yao Ruiyi who sent Xu Heng back.

She is still the driver.

When she got home, she didn't stay for another minute and went back.

Zhou Xiu'e's face was full of smiles, "I'm back! Come on! Sit down! Have a good rest."

Yue Pingting also rushed over with her homework after throwing her schoolbag at home.

"Auntie! Here I come!"

Zhou Xiu'e looked at Yue Pingting, it was the first time that she took the initiative to bring homework.

Can't help but ask, "Which one is this?"

Xu Heng smiled.

Yue Pingting said helplessly, "Auntie! I'm here to study, no way!"

"All right, all right! Come to our house, you can learn or not!"

Yue Pingting felt despised.

Xu Heng went to the study to play games, while Yue Pingting studied.

When she encountered a question she didn't understand, she wanted to not ask for a while, so as not to disturb Xu Heng, but...

Xu Heng, "It's okay, show me."

Yue Pingting's scalp was numb and she handed over the question.

Xu Heng glanced quickly, and then said, "This requires a theorem, it's like this..."

Talking and playing games.

He can kill three times with one mind, but in the end he himself died!

After putting down the mouse, Xu Heng gave Yue Pingting a good talk.

"Will it be?"

Yue Pingting, "Yes! But...you are so disrespectful! I will fight you!"

"Boom!!!~~~"

Depend on!

Yue Pingting, you little lunatic!

This is my home, and the door of the study is still playing!

Are you going to do something?

it is good!

This is what you forced me to do!

Xu Heng also pushed forward and pulled Yue Pingting into his arms.

"Your revenge is not good! I will teach you some more..."

brush!

Yue Pingting struggled.

She was just scratching the surface, messing around with Xu Heng.

But Xu Heng doesn't care about that much, you provoked the incident, and it has developed to the point where you can't control it!

After a while, Yue Pingting left.

Xu Heng smirked.

Yue Pingting stomped her feet, "Bullying!"

Xu Heng continued the game.

Yue Pingting's heart beating faster, but it has not been calm for a long time.

"dong dong dong dong dong dong dong..."

Looking at the topic, she was also completely absent-minded.

Zhou Xiu'e walked in, looked left and right.

After watching for a few minutes, Yue Pingting didn't even start writing.

She moved to Xu Heng's side, "Son, stop playing, it will affect Xiaoyuezi's study!"

Xu Heng, "???"

"Mom! I'm wearing earphones and there's no sound. Doesn't it affect her?"

Zhou Xiu'e rolled her eyes, "It's hard for Xiao Yuezi to study seriously once, you can't do this, hurry up, stop playing!"

Xu Heng had no choice but to say, "Mom, that's not the reason for her, she is..."

Yue Pingting stood up immediately like a frightened bird, "That's why! Auntie, I'd better go to the living room to study!"

Zhou Xiu'e, "No need! Just study in the study, Xu Heng, come out!"

Xu Heng, "Okay, okay! I won't play this game after it's over."

In the end, four kills ended the game.

Xu Heng turned off the phone and rolled his eyes at Yue Pingting.

Yue Pingting was aggrieved, "It's not me, it's my aunt, or if my aunt loves me, you know how to bully me."

Xu Heng, "..."

Yue Pingting, "In order to give you this opportunity to compensate me, teach me another problem! You are best at physics."

"It's so hard! Oh my God! It gives me a headache seeing this!"

topic:

There is a uniform strong electric field in a cylindrical area. The cross-section machine of the column is a circle with O as the center and radius R, and AB is the diameter of the circle, as shown in the figure.

Charged particles with mass m and charge q (q>0) enter the electric field at different speeds from point A on the paper, and the direction of the speed is perpendicular to the direction of the electric field.

It is known that the particle whose speed is zero when it first enters the electric field will string out of the electric field at the speed V0 from the point C on the circle, and the included angle Θ=60 between AC and Ab.Particles in motion are only affected by electric field forces.

(1) Find the magnitude of the electric field strength;

(2) In order to maximize the kinetic energy increment of the particle after passing through the electric field, what should be the velocity of the particle when it enters the electric field?

(3) In order to make the momentum change before and after the particle passes through the electric field be mV0, what should be the velocity of the particle when it enters the electric field?

Xu Heng, "This question... is difficult?"

Yue Pingting nodded seriously.

Xu Heng frowned, "It's obviously very simple!"

Yue Pingting made a bitter face.

Xu Heng sighed, "Okay, I'll explain it to you. But..."

Xu Heng then smirked.

Yue Pingting pouted, "What are you doing! Xu Heng, you bastard, you you you..."

Boo!

Xu Heng, "As long as you take revenge, I'm not allowed to fight back?"

There is no reason why only state officials are allowed to set fires, but the people are not allowed to light lamps!

Yue Pingting's small mouth was very red!

"Humph!"

Xu Heng laughed out loud.

"Alright, alright, listen carefully."

"Tell you that the initial velocity is 0, and finally passes through point C. This is another uniform electric field, and the electric field lines are straight lines, so this particle must be moving in a straight line with uniform acceleration, so the electric field lines must be straight in the direction of AC. Walk!"

"This question asks you to find the electric field strength."

"So here we need to use the kinetic energy theorem to know."

"Looking at the picture, connecting OC, the length is the same, this, and this, and the angle is still 60, so..."

Yue Pingting is getting better, "So this is an equilateral triangle!"

Xu Heng nodded.

"So the length of AC is equal to R. You should know that F=Eq, so the work done by the electric field force should be F*AC=1/(2mV0 square), so does this E come out?"

According to Xu Heng's explanation, Yue Pingting listed the formula:

E=(mV0 square)/(2qR)

Xu Heng, "Yes, the first question is easy to handle, right?"

Yue Pingting opened and closed her mouth, really!

It is too simple!

Yue Pingting, "What about the second question?"