Super Xueba: Start With A Low Control Score!

Chapter 66 The third science examination, is this too simple?

Have you ever seen an ordinary evening self-study, and there are more than a dozen teachers standing outside the window to inspect it?

That look…

Is it even more aggressive and aggressive?

Before that.

Class 304 children’s shoes have never been experienced.

But today.

They really felt it.

It doesn’t matter if you have a good grade. Anyway, you can’t extricate yourself from being immersed in a sea of ​​questions.

But the results are a little bit worse.

For example, Fatty Wang is a kind of learning scum that is called holding a book and studying hard, but in fact he is playing soy sauce. The pressure can be described as great.

Many children’s shoes are sitting right up, afraid to make any small movements, for fear of being grasped by the teachers.

I was meditating in my heart: “Teacher, that’s enough, it’s almost time, it’s time to go, let’s go to another class for inspection!”

However……

Things backfired.

One minute!

Two minutes!

three minutes!

…

Ten minutes passed.

Many math teachers were still standing outside the window, pointing to someone in the class and wondering, without the slightest intention to leave.

this……

The scumbags were crying and desperate.

They had heard that many Chinese teachers did not invigilate the math test in the afternoon, but ran to see a schoolmaster.

As a result, many children’s shoes in the examination room couldn’t stand the pressure, collapsed one after another, and even blew themselves up and cheated and abandoned the exam.

Before……

They just listen to it as a joke.

Didn’t care.

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

More than a dozen teachers are staring outside the window.

Gee!

There is no ghost inside.

Once there is a ghost inside.

The pressure is not too small.

Many children’s shoes almost couldn’t help taking the initiative to take out their mobile phones from their pockets and offer them obediently.

“Teacher, I violated school rules and disciplines and brought my mobile phone into the school. Please confiscated it and leave.”

“Can’t stand it anymore, it’s about to collapse.”

“Please give me a way to survive!”

“Woohoo!”

“…”

For some children’s shoes in Class 304.

Self-study this evening.

Destined to be a nightmare.

Meat was cut by a blunt knife.

You can’t live, you can’t die.

But Jiang Nan, as the person involved, realized the purpose of Cao Tianyuan and others, so he cursed inwardly and ignored the math teachers.

I saw him put the phone in his pocket and stopped reading the novel. He just lay down on the table and fell asleep.

“Look! Look!”

“Just look at it, it’s a big deal, I just sleep.”

“I don’t believe it.”

“You can still see a piece of my meat.”

“There is a saying, he will force him to be strong, the breeze will blow the hills, he will let him be horizontal, the bright 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.

The duration is two and a half hours.

The theory complex includes material and metamorphism, which belong to the same paper.

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

“Ding, please get 300 points for this comprehensive examination.”

There are no accidents.

The moment before the test paper is issued.

The system alert sounded in Jiang Nan’s mind again.

Similar to the first Chinese and the first mathematics, the system allows him to get full marks for the third reasoning.

Ha ha!

Full marks?

A full score is a full score!

Anyway, they are already famous, and earning points is important.

Once the test paper is available.

He walked away from the dragon and snake, and quickly answered.

First is physics?

Um!

simple.

Then chemistry?

Um!

Still simple.

Is the last creature?

Uh?

Isn’t this too simple?

Even in junior high school…cough cough, elementary school students can do it, basically not the kind of half-difficulty.

There are 21 multiple-choice questions in the first part. Jiang Nan takes three seconds to complete all of them in one minute.

The second part is non-choice questions, a total of 10 questions, 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 so little meaning, it’s worth spending two minutes.

“As shown in Picture A…

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

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

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

It is known that the electric charge of the ball is q=8×10^-7C, the mass m=1. 0kg, sin37°=0, 6, cos37°=0, 8, and the acceleration of gravity g=10m/s^2.

(1) If the ball slides to the abscissa x in the figure, the elastic force of the rod on it is exactly zero, find the charge Q fixed at the positive point 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 speed v0=4m/s, it can move to point N, and then return to point M, find the kinetic energy Ekm when the ball returns to point M . ”

The topic is interesting.

But it’s just a bit interesting.

Jiang Nan took ten seconds to scan the question, and then he answered on the answer sheet without hesitation.

As for the draft paper?

Ha ha!

That’s a joke.

Like the previous language and mathematics, he didn’t need any draft paper at all in this comprehensive examination.

Even the legendary finale of physics does not require him to spend more time practicing on draft paper.

untie……

(1) At X, it can be known from the force analysis.

kQq/r^2=mgcos37°.

in……

Know from the question…

Substituting data into…

Q=6, 40×10^-5C.

(2) From the figure, the electric potential energy of the ball at x is equal to E0, which can be obtained…

E. =mgrcos0=1, 92J.

(3) Suppose the process of the ball from M to N, the work done by overcoming the electric field force is W, the process from M to N is -mgLsin0－W+(E1-E2)=0－1/2mv0^2.

Solutions have to……

It can be seen from the symmetry…

Substituting the data into the solution, Ekm=2, ​​976J.

…

All in one go.

There is no pause.

Jiang Nan finished the physics finale.

Gee!

too easy.

No effort at all!

How lonely is Invincible, how emptied Invincible is, alone in the top, the cold wind blows constantly…