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

Xu Heng stood up, "???"

Glance.

Why didn't she finish it?

He also said that if he wanted to help me, he would not be able to protect himself.

……

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Chapter 28

Xu Heng glanced sideways!

Originally, the invigilator wanted to remind me.

But when the two think about it, it doesn't matter if they look at it. Anyway, the grades are different, and there is still a big gap between the sophomore and the senior year.

It is impossible for Xu Heng to do so.

So I didn't pay much attention.

The last finale question of physics in the third year of senior high school:

A large metal bucket with a mass of m=200kg and a height of 2.00m is placed upside down on the bottom of a wide pool, as shown in the figure.

桶的内横截面积S=0.500平方米，桶壁加桶底的体积为V0=2.50*10（-2次方）立方米，桶内封有高度为L0=0.200m的空气。池深H0=20.0m，大气压强P0=10.00m水柱高，水的密度p=1.000*10（3次方）kg/s（平方），重力加速度取g=10.00m/s（平方）。

If the bucket is lifted up by the sling rope shown in the figure so that the bottom of the bucket reaches the water surface, what is the minimum work done by the tension of the rope on the bucket? (Three significant figures should be reserved for the result) Regardless of the resistance of water, the water temperature is assumed to be very low, regardless of the influence of its saturated vapor pressure.

And set the water temperature up and down uniform and remain unchanged.

The topic is difficult!

It's no wonder that Feng Nianchang gave up, because if this question is calculated, it will definitely be the end of the exam.

Even after the exam is over, it may not be finished!

After finishing it, Feng Nianchang didn't have the confidence to say that he was right.

So she can't make a big deal out of small things.

She has no confidence, but Xu Heng does!

Immediately took out the straw paper, thought for a while, swish, swish, and started writing.

Feng Nianchang, "???"

what is he writing

The priority right now, shouldn't he show me his test paper?

Why did he fold the test paper early and put it under the straw paper?

Brain full of question marks.

Play on the papyrus:

"When the bucket sinks to the bottom of the pool, the gravity of the bucket itself is greater than the buoyancy of the fish..."

The gravitational potential energy increment of the bucket involves too many situations.

Take into account when the bucket is fully submerged, half the time, and not submerged.

Xu Heng wrote methodically, step by step.

These formulas are also marked with 1234567, and finally, these formulas are substituted one by one to get a formula.

Substituting the relevant data into the calculation, and then taking three effective digits, you can get W= *10 (4th power) J!

The answer to this question alone is full of acting papers.

It is the size of straw paper, slightly larger than A4 paper.

Xu Heng's handwriting was deliberately small, just enough for Feng Nianchang to read clearly.

When the acting straw paper appeared in front of Feng Nianchang through some blind spots, she was dumbfounded.

It was agreed that she would help Xu Heng!

Unexpectedly, he made the finale of his senior year in high school!

She took a rough look, and her train of thought was correct!

Check the data again, it seems to be correct!

"I, this, this, this..."

Feng Nianshang's hands were shaking.

She watched Xu Heng answer the whole process!

From looking at the question to making it, it didn't take 10 minutes!

Omg!

What the hell is this...

Bah bah bah!You can't swear!

What kind of academic master is this!

Feng Nianchang's scalp was numb, and he looked at Xu Heng.

At this time, the invigilator passed by.

"Ahem! Don't look around! Hurry up and answer the questions!"

Feng Nianchang came back to his senses and stared at the straw paper in his hand.

The invigilator said, "Since you have answered it on the paper, please write it on the test paper as soon as possible! Don't lose money if you haven't written it on the test paper when the time is up."

Turning around, the invigilator left, but still couldn't help but look sideways, and looked at Feng Nianchang twice more.

I was shocked!

This little girl is amazing!

The finale of the physics test paper was actually done on straw paper!

Isn't she afraid of running out of time?

Weird!

It's really weird!

One Xu Heng in this examination room is already against the sky!

Unexpectedly, another one came out!

Feng Nianchang shamelessly copied the answer.

As she wrote, she understood and even whispered in amazement.

The prison teacher passed by, "???"

What's the matter with this classmate?

Are you bragging about yourself?

It must be too narcissistic!

After finishing the final question, Feng Nianchang began to check.

She couldn't help but glance at Xu Heng, who was lying there again, not even reading the test paper.

she wondered.

Is he done?

Can you make sure it's all correct?

Otherwise why didn't he check?

No one can be sure that they are 100% correct, right?

But on second thought.

This guy even solved the physics finale of his third year of high school without any effort. Isn't it easy for the second year of high school?

so horrible!

She seemed to be gradually aware of Xu Heng's horror.

Just like a speck of dust, it fell into the boundless universe.

But, it's not what she can covet at all!

When there are 15 minutes left in the exam.

Sure enough, Xu Heng handed in the papers ahead of schedule again.

Immediately afterwards, Feng Nianshang also handed in the paper.

She was afraid that Xu Heng would not be found.

After chasing after him, Feng Nianshang said, "Xu Heng! Wait!"

Xu Heng, "?"

"Well, the physics exam just now..."

Xu Heng, "Oh, that question! You're welcome, I thought you couldn't, so I just did it."

"Didn't you say that this exam is very important to you? So I will be a good person to the end."

Feng Nianshang slapped himself on the forehead fiercely, and broke down, "I said that's not what I meant, do you believe me?"

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Chapter 29

"letter."

Feng Nianchang pouted, "But I always feel that you don't believe it..."

Xu Heng comforted, "Sister, don't think too much."

Feng Nianchang felt so helpless for the first time!

I wanted to help others, but I didn't expect to be helped by them in turn.

"In this way, I owe you two favors!"

"Xu Heng, how is your chemistry?"

Xu Heng smiled and was very polite.

The corners of Feng Nianshang's eyes twitched, and he asked bravely, "Is there anything you're not good at in the exam tomorrow?"

Xu Heng still smiled.

Feng Nianchang's face turned dark.

Exams are over tomorrow!

She has absolutely no chance!

"Oh my god! What kind of academic master are you! Don't you have any partial subjects?"

Xu Heng, "This...you can have it, but I made a bet with someone else."

This...can you have it? !