Super Scholar: Start with a low regulatory score!

Chapter 66 The third comprehensive test of science, isn't this too easy?
Have you ever seen an ordinary evening self-study, there are more than a dozen teachers standing outside the window to inspect and not leave?

That look...

Is it even more aggressive?
Before this.

Class 304 children's shoes have never experienced it.

But today.

They really felt it.

It doesn't matter if you are a top student with good grades, anyway, you can't extricate yourself from being immersed in the sea of ​​questions.

But the results are poor.

For example, Wang Fatty, who is called holding books and studying hard, but is actually a soy sauce, the pressure can be described as huge.

Many children's shoes are sitting upright, not daring to make any small movements, for fear of being caught by the teachers.

I was thinking silently: "Teacher, that's enough, it's almost done, it's time to go, let's go to another class to inspect!"

however……

Backfired.

1 minutes!

2 minutes!
3 minutes!
……

10 minutes passed.

Many math teachers were still standing outside the window, pointing at someone in the class in amazement, without the slightest intention of leaving.

This……

The dregs of the students were all crying and despairing.

They had heard that during the afternoon math test, many Chinese teachers did not invigilate the test, but went to see a certain master.

As a result, many children's shoes in the examination room couldn't withstand the pressure, collapsed one after another, and gave up the examination without hesitation in blaming themselves for cheating.

Before……

They only listen to it as a joke.

did not care.

But now, they can finally understand the inner feelings of those who blew themselves up and cheated.

Teacher No. [-] stared out the window, unable to leave.

Gee!

It's fine if there are no ghosts in your heart.

Once there is a ghost in the heart.

That pressure is not insignificant.

Many children's shoes almost couldn't help taking out their mobile phones from their pockets and offering them obediently.

"Teacher, I violated the school rules and discipline and brought my mobile phone into the school. Please confiscate it and leave quickly."

"I can't take it anymore, I'm about to collapse."

"Please give me a way to survive!"

"Woooooo!"

"..."

For some children's shoes of class 304.

This section is evening self-study.

Definitely a nightmare.

Cut by blunt knives.

You can't survive, you can't die.

However, Jiangnan, who was the person involved, realized the purpose of Cao Tianyuan and others' visit, only cursed inwardly, and ignored those math teachers.

He put his cell phone in his pocket, stopped reading novels, lay down on the table, and fell asleep soundly.

"Look! Look!"

"Look at it casually, at worst, I'll just sleep."

"I don't believe it."

"You can still see a piece of my meat."

"There is a saying, he is strong and he is strong, the breeze is blowing on the hills, he is tyrannical, and the moon shines on the river..."

"As long as I don't feel embarrassed, the embarrassing thing is..."

"..."

The next day.

Wednesday.

nine in the morning.

The third session of the monthly exam begins.

It's two and a half hours long.

Li Zong includes material and chemical students, which belong to the same paper.

Among them, physics accounts for 110 points, chemistry accounts for 100 points, and biology accounts for 90 points, for a total of 300 points.

"Ding, please get 300 points for this comprehensive exam."

No accidents.

The moment before the test papers are issued.

The system prompt sounded again in Jiangnan's mind.

It was the same as the first Chinese and the first mathematics. The system gave him full marks in the third comprehensive science.

Ha ha!

Full score?

Full marks are full marks!

They are already famous anyway, earning points is important.

As soon as the test paper is in hand.

He followed the lead and answered quickly.

Physics first?
Ah!
simple.

And then chemistry?
Ah!
Still simple.

And finally the creatures?

Uh?
This is too simple, right?
Even in junior high school... Ahem, elementary school students can do it, and it's basically not half difficult.

The first part of the multiple-choice questions, a total of 21 questions, Jiangnan is a three-second question, and everything can be done in one minute.

The second part is non-choice questions, 10 questions in total, 4 questions in physics, 4 questions in chemistry, and 2 questions in biology.

Biology is to send sub-questions.

Chemistry is also a sub-question.

As for physics, the last finale question has a little meaning, and it is worth spending 2 minutes.

"As shown in Figure A...

M, P, and N are the three vertices of a right triangle, the angle between NM and MP is 37°, and a positive point charge of Q is fixed at the middle point of MP.

The length of the rough insulating rod MN is L=1m, and the x-axis is established along the MN direction (take x=0 at point M).

Put a positively charged ball (which can be regarded as a point charge) on the rod and release it from the rest at point N. The changes of the gravitational potential energy and electric potential energy of the ball with the position x are shown in Figure B (a) and (b) As shown in the figure, the potential energy E1=3E0/5, E2=E0/3.

已知小球的电荷量q=8x10^－7C，质量m=1。0kg，取sin37°=0、6，cos37°=0、8，重力加速度g=10m/s^2。

(1) If the ball slides down to the abscissa x in the figure, the elastic force of the rod on it is exactly zero. Find the charge quantity Q of the positive point charge fixed at the midpoint.

(2) Find the electric potential energy E0 of the ball at the abscissa x.

(3) If the ball moves upward along the x-axis from point M with an initial velocity v0=4m/s, it can just move to point N, and then returns to point M. Find the kinetic energy Ekm of the ball when it returns to point M . "

The topic is interesting.

But it's just kind of interesting.

Jiang Nan spent ten seconds scanning the questions, and then answered on the answer sheet without thinking.

As for scratch paper?
Ha ha!

That's a joke.

Like the previous Chinese and mathematics, he didn't need any draft paper at all for this science comprehensive test.

Even for the legendary finale of physics, he didn't need to spend much time practicing on scratch paper.

untie……

(1) At X, it can be known according to force analysis.

kQq/r^2=mgcos37°.

in……

From the meaning of the title...

Substitute data to get...

Q=6, 40x10^-5C.

(2) From the figure, the electric potential energy of the ball at x is equal to E0, we can get...

e. =mgrcos0=1, 92J.

(3)设小球从M到N的过程，克服电场力做功为W，从M到N的过程有-mgLsin0－W+(E1-E2)=0－1/2mv0^2。

Solutions have to……

From the symmetry it follows that...

Substituting the data to solve Ekm=2, ​​976J.

……

All in one go.

There was no pause.

Jiang Nan finished the physics finale.

Gee!

too easy.

It's completely effortless!

Invincible is so lonely, invincible is so empty, alone in the peak, the cold wind keeps blowing...

(End of this chapter)