My Identity As A Schoolmaster Has Been Exposed

This week is fleeting, especially with Xu Cong's physics class. Other teachers are impressed by Xu Cong and begin to improve their teaching mode.

Many students are getting more and more happy to attend classes. To be precise, it is because they love performance and want to be recognized, so they look forward to class more and more.

"Since I was little, I have never been so excited!"

"For the first time so looking forward to a math class!"

"No! Me too! The math teacher lets us prepare the questions ourselves and give the answers ourselves! We will still talk about it in the class at that time!"

"I went to ask the seniors in high school!"

"For seniors, why don't you ask Xu Cong?"

"You think I don't want to, but I can't queue up!"

"Ahahaha-, you are fine with this!"

It is precisely because of this that the enthusiasm of the students has become more and more high. After school is around, Lin Mengjiao also discusses with Xu Cong.

But sitting in the head teacher’s car, the discussion was very quiet. It was still Su Rui who sent Xu Cong back, and she was still the driver who sent Xu Cong home. After she left Xu Cong home without waiting for one more minute, she left.

Zhou Xiuyun said with a smile on her face: "My son is back! Come and come! Sit! Take a good rest."

Lin Mengjiao also rushed over after throwing her schoolbag at home with her homework and shouted: "Auntie! I'm here!"

Zhou Xiu'e looked at Lin Mengjiao in surprise. It was the first time she took the initiative to bring homework. She couldn't help but ask, "Which one is this?"

Xu Cong looked at her and smiled, Lin Mengjiao said helplessly: "Auntie! I'm here to study, no way!"

"You can do it! You can come to our house, you can learn or not!"

When Lin Mengjiao heard this, she felt despised. Soon Xu Cong went to the study to play games, while Lin Mengjiao learned by herself.

When encountering a question that she wouldn't know, she wanted to leave it alone or disturb Xu Cong for the time being, but Xu Cong inadvertently caught her frown and couldn't help asking: "It's okay. Show me."

Lin Mengjiao's scalp numb and handed over the question, Xu Cong glanced quickly, and then said: "This requires a theorem, it's like this"

While talking, he was playing games, he could kill three times with one heart, two uses, but in the end he himself died. Putting down the mouse, Xu Cong gave Lin Mengjiao a good talk.

"Will it be?"

Lin Mengjiao's little chicken nodded: "Yes! But you are too disrespectful! I'm fighting with you

"Wave!!!~~~"

Depend on!

Lin Mengjiao, you little lunatic!

This is my home, and the door of the study is still ajar. Are you going to do something?

good!

This is what you forced me!

Xu Cong also had to take an inch and pulled Lin Mengjiao into his arms, "You can't get revenge! I'll teach you some more..."

brush!

Lin Mengjiao is struggling, she is just a little bit of a mess, messing around with Xu Cong.

But Xu Cong doesn't care about so many things, you are the one who provoked things, and this has already developed beyond your control!

After a while, Lin Mengjiao left. Xu Cong smirked, Lin Mengjiao stomped her feet, and pretended to mutter, "Bullying people!"

Xu Cong then continued to play the game happily, Lin Mengjiao's beating heart accelerated, but he did not return to calm for a long time.

"Boom boom boom boom boom boom boom boom boom..."

Looking at the subject, she was also completely absent-minded. Zhou Xiuyun walked in and looked left and right. After looking at it for a few minutes, Lin Mengjiao still did not write.

She approached Xu Cong, leaned down and said to him, "Son, stop playing, it will affect Xiaojiao's study."

Xu Cong looked at the screen with blank eyes, a question mark in his heart: "???"

He turned his head and looked at Lin Xi again, and said, "Mom! I wear headphones and there is no sound. Doesn't it affect her?"

Zhou Xiuyun gave him a big roll of eyes, and said to him: "It's hard for Xiaojiao to study seriously. You can't do this, hurry up, don't play!"

Xu Cong said helplessly: "Mom, she is not for this reason, she is..."

When he said this, Lin Mengjiao stood up like a frightened bird, immediately stood up, and said in surprise: "It's because of this! Auntie, I should go to the living room to study!"

Zhou Xiuyun continued: "No! You just study in the study, Xu Cong, come out!"

Xu Cong saw his mother who couldn't help himself, and said to her: "Okay! This game is over and I won't play it."

Finally, the four kills ended the game, Xu Cong turned off the phone and took a look at Lin Mengjiao in the car.

Lin Mengjiao said aggrievedly: "It's not me, it's the aunt, or the aunt loves me, you know you are bullying me."

Xu Cong was a little speechless, and he didn't do anything.

Lin Mengjiao took this opportunity to say: "In order to give you this opportunity to compensate me, teach me another problem! Physics, you are the best at it."

"It's so hard! Oh my God! I have a headache when I see this!"

topic:

In a cylindrical area, there is a uniform electric field. The cross sectioning machine of the column is a circle with 0 as the center, radius R, and AB as the diameter of the circle, as shown in the figure.

Charged particles with a mass of m and a charge of q 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 particles with zero velocity when they just enter the electric field, string out the electric field from point C on the circumference at a rate of vO, and the angle between AC and Ab is O=60. Particles in motion are only affected by electric field forces.

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

(2) In order to maximize the increase in kinetic energy of the particle after passing through the electric field, what speed should the particle enter the electric field?

(3) In order to make the magnitude of the momentum change of the particle before and after passing through the electric field be mV0, how fast should the particle enter the electric field?

After reading it, Xu Cong asked indifferently: "This question is difficult?"

Lin Mengjiao nodded seriously, but Xu Cong blinked and said, "It's obviously very simple!"

Lin Mengjiao's face was bitter, and Xu Cong sighed, "Okay, I'll tell you a lot."

But... afterwards Xu Cong smirked, Lin Mengjiao curled her lips, "What are you going to do! Xu Cong, you are a bad thing, you, you, you..."

Boo!

Xu Cong chuckled, "As long as you take revenge, I am not allowed to fight back?"

There is no reason that only the state officials should set fires and the people are not allowed to light the lights. Lin Mengjiao's little mouth is very red!

"Humph!"

Xu Cong laughed and said seriously: "It's alright, listen carefully."

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

"This question asks you to find the electric field strength, so here you have 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..."

Lin Mengjiao was getting better and started to analyze together: "So this is an equilateral triangle!" Xu Cong nodded.

"So the length of AC is equal to R, you should know F=Eq, so the work done by the electric field force should be F×AC=1/(2mV₀²), so is this E coming out?"

According to Xu Cong’s explanation, Lin Mengjiao listed the formula: E=(mV₀²)/(2qR)

When Xu Cong saw him write the formula, he smiled: "Yes, the first question is easy, right?"

Lin Mengjiao opened her mouth and closed her mouth again, really, it's too simple!

Lin Mengjiao asked immediately, "What about the second question?"

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