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

Wang Hanshan added another knife, "Professor, do you think Xu Heng will spend more than ten minutes to solve this problem?"

Pooh!

You, Wang Hanshan, don't be crowed!

This idea was brewing in Fang Zhonggui's mind, and he was about to say it.

Xu Heng sent a message, "Professor, there are at least two solutions to this question...".

Chapter 169

Fang Zhonggui's question was originally prepared for the candidates of the physics entrance examination.

Wang Hanshan also read it.

He is very self-aware, he knows how much he is, this problem is no longer a matter of time, but that he simply can't do it.

Fang Zhonggui also knew this, and at the same time, he believed that it was very unlikely that Xu Heng could answer it!

But now-

Xu Heng's news shocked him.

"Whirring whirring……"

Fang Zhonggui's first reaction was to take a deep breath and try to keep himself as calm as possible.

Fortunately, there were two previous shocks as a foreshadowing, so he was able to slow down.

And in his heart, at this moment, the most is: "He is Xu Heng! He is Xu Heng! He can solve such a problem in 15 minutes! It is not impossible for him to solve this problem!"

"He is Xu Heng..."

"He is Xu Heng..."

Repeat over and over!

But after Fang Zhonggui calmed down, he was very depressed.

He almost flipped the table!

"He is Xu Heng, but he is too deceptive!"

"Is one solution not enough? You even gave me the second one!"

The corners of Fang Zhonggui's eyes twitched!

He looked at the answer he had prepared, and there was only one solution!

It was only then that Fang Zhonggui realized that this Xu Heng was far from being comparable to a graduate student.

"hiss……"

Seeing that Fang Zhonggui did not reply to his message, Wang Hanshan took the initiative to send a message, "Professor?"

Fang Zhonggui took a screenshot and sent Xu Heng's original words to Wang Hanshan.

"!!!"

Wang Hanshan jumped up directly from the dormitory!

Roommates, "???"

"what happened?"

Wang Hanshan was short of breath and couldn't speak fluently, "He, he, this, this professor, this..."

The roommates came over and looked at Wang Hanshan's chat records.

"Damn! This, this, this..."

"My shit! My shit!! My shit!!!"

"Fuck! F*ck! F*ck!"

"Is this still a human?!"

"What the hell! What the hell are you doing...!"

"Really! Has the professor confirmed it?"

Wang Hanshan took a deep breath, and then calmed down a little, "Since Xu Heng has said that, it must not be a grandstanding!"

Roommates, you look at me, I look at you.

"This……"

Everyone's eyes widened, trying to say something, but they couldn't say it.

They have read that question, and it is far from enough at their level.

"Why don't you go to the group and ask the junior seniors?"

Wang Hanshan nodded, "OK!"

Find the junior senior and chat privately, "Senior, we have a question here, can you help us look at it?"

The senior, "No problem!"

After the question was sent, the senior was silent.

Wang Hanshan, "Senior?"

Senior, "Um... where did you find the topic?"

Wang Hanshan, "???"

"What's wrong? Senior!"

Senior, "Where did you find this question?"

Wang Hanshan curled his lips, feeling a bad feeling, "The professor said he prepared it carefully..."

"We thought it was our freshman topic, so we asked you for advice..."

The senior almost scolded the street, "This is not a freshman topic! I can't even know it! I thought it should be a postgraduate entrance examination topic!"

Wang Hanshan, "!!!"

"But the professor didn't say it...he just said it was carefully prepared..."

"Xu Heng also made it! It seems that it only took ten minutes, and there are two solutions..."

The senior is not well, "%￥@##@#￥￥......"

He was broken!

Before, he joined the group purely out of curiosity, but now, he finally realized how scary Xu Heng is.

"It's simply not human!!!"

What was even more shocking was Fang Zhonggui.

In the office, he sat upright, meticulous.

Because right now, he is having a voice call with Xu Heng.

Xu Heng, "Professor, I have limited time. I only have time for this big class break. I will start class later! What can you do?"

Fang Zhonggui, "I want to ask you about different solutions to this problem'."

Xu Heng was stunned for a moment, "Professor, are you joking? Why do you need to ask me for advice!"

Fang Zhonggui's face turned dark.

Stop teasing me, kid!

"%￥#@#￥￥..."

Fang Zhonggui, "I'm serious! Student Xu Heng."

Xu Heng, "Eh... Then I really said...Professor?"

Fang Zhonggui sat upright with his ears pricked up and a pen and paper in his hand.

Xu Heng, "The first solution involves the motion theorem of the center of mass."

Fang Zhonggui, "Yes."

Xu Heng, "The professor knows, so let's talk about the second type."

Fang Zhonggui once again turned black.

What the hell?

Although my solution uses the motion theorem of the center of mass, what do you mean by the way you communicate with me?

When Fang Zhonggui reacted, he also realized.

Isn't that how many students communicate with each other?

In a word, just one click!

They are very compatible with each other!

"Okay...how about the second one?" Fang Zhonggui compromised.

Xu Heng, "To establish a coordinate axis, the angular force of the particle group is used. Professor, you should know it?"

Fang Zhonggui was dumbfounded.

knowledge?

I know your sister!

Xu Heng, what you said seems to be nothing, but it is extremely insulting!

Too much!

You are too much!

Fang Zhonggui's forehead was throbbing with blue veins.

Although Fang Zhonggui can slowly figure it out when he thinks about it carefully, but now he doesn't know!

More importantly, he wanted to understand Xu Heng's entire thinking on solving the problem.

What does it mean that Xu Heng has stopped now?

Xu Heng, "Professor? Are you listening? Professor?"

Fang Zhonggui clenched his teeth, and his voice squeezed out from between his teeth, "Student Xu Heng, don't be fooled, the second solution, let's explain it carefully!"

Xu Heng, "Uh... alright."

"Hey……"

In the end, he sighed, because in his opinion, as long as a university professor knows the direction, can he understand it?

Besides, such a question is not worth mentioning in the eyes of university professors... right!

Is this Professor Fang making a big deal out of a molehill?

Xu Heng felt that he was deliberately making things difficult for him!

Fang Zhonggui listened to it even more unpleasantly.

What does this guy mean, and he sighed, looking very reluctant?

Xu Heng, "Establish the rectangular coordinate system Oxy, the x-axis is perpendicular to the baffle, and the y-axis coincides with the baffle, and VAx, VAyv, VBx, VBy, VCx and VCy represent the ball C and the baffle just after the collision A, B and VCy respectively. The weight of C three-ball speed..."

"..."

"Use J to represent the magnitude of the impulse that the baffle acts on the ball C, and its direction is along the negative direction of the x-axis. According to the momentum theorem of the particle group, there are..."

"..."

Xu Heng spoke in one go, methodically.

"According to the meaning of the question, from the end of the collision between the ball C and the baffle to the ball A... In order to find the rotational angular velocity, the velocity of the ball B relative to the center of mass can be investigated."

"From 11 to 15, the velocity of the center of mass P of the system at the end of the collision between the ball C and the baffle..."

“VPx=（MVAx+MVBx+MVCx）/3m=(2/3)V0sin2α，这是16式子。”