Super Xueba: Start With A Low Control Score!

Chapter 116 You can know the answer only by physical instinct!

“Why is it 88 points again?”

“Or……”

“These four games all let me control 88 points?”

“If this is the case, it is also good, at least it will not be too eye-catching. After all, it is impossible to be the first.”

Jiang Nan thought secretly.

Then he got the physics test paper and glanced at it.

Five multiple choice questions.

Each question is 6 points, a total of 30 points.

Five fill-in-the-blank questions.

Each question is 6 points, a total of 30 points.

Two answer questions.

Each question is 20 points, a total of 40 points.

And he needs to control the score at 88. The easiest way is to make the wrong multiple-choice question and fill-in-the-blank question.

Um!

Perfect.

Attention was settled and Jiang Nan started directly.

first question.

“As shown in the figure, the upper end of a light bomb with a stiffness coefficient of h is fixed on the ceiling, and the lower end is connected to a small ball with a mass of m. The balance position of the ball is 0 as the origin of the coordinate.”

“The positive direction of the x-axis is down. If the origin of the coordinate is taken as the zero point of the potential energy of the system, when the ball is located at the position of coordinate x0, the total potential energy of the system is…”

A: 1/2kxo^2-mgxo.

B: 1/2k (xo+mg/k)^2-mgxo.

C: 1/2k (xo+mg/k)^2.

D: 1/2kxo^2.

…

Jiang Nan: “…”

Somewhat speechless.

Just because…

He always feels that the author of the question is insulting his IQ.

Such a simple question.

Is it really necessary to take the exam?

And it’s still a so-called competition?

Almost without even thinking about it, he chose B.

As for multiple choices?

Obviously, there is no multiple choice.

And the problem-solving process?

Does this still need a problem-solving process?

Wouldn’t anyone really know how to do such a question?

If so, you can only go to the hospital to check to see if there is a problem with your IQ.

Questions were screened.

Almost in the blink of an eye.

Jiang Nan finished the five multiple-choice questions.

Uh!

All right!

Looks like one more mistake.

In order to control the score of 88, he had to wipe the last multiple-choice question again, deliberately filling in a wrong answer.

Then……

It is four fill-in-the-blank questions.

same!

He almost came from physical instinct.

Get all the fill-in-the-blank questions right in one go.

As a result, he had to erase one question and replace it with the wrong answer as before.

Why!

This damn instinct!

The only blame is that his physical level is too high and the physical foundation is too strong. It is really a touch of sadness.

but……

Get the 12 points that should be deducted.

The next two answer questions are easy to handle.

Eleven questions (20 points).

“As shown in the figure, a rectangular flat plate with a mass of M and long enough is stationary on a smooth horizontal ground.

The left end of the flat plate is connected with a horizontal light spring with a stiffness coefficient of h, and the other end of the spring is fixed on the wall; there is a small mass of m on the flat plate.

At the moment of 1=0, the plate is stationary.

The small block starts to move to the right at the speed of the dish.

It is known that the sliding friction factor between the small object and the flat plate is μ, and the magnitude of the gravitational acceleration is g.

(1) Prove that: during the process of the small object sliding to the right relative to the plate, the movement of the plate is a simple motion. Find the amplitude and frequency (period) of the simple motion.

(2) If the plate starts to move from time t=0 to a quarter of the period, it happens that the small object is stationary relative to the plate for the first time, ask…

(i) The value of the initial velocity of the small block.

(ii) The heat generated by the plate during a quarter cycle of movement. ”

…

Jiang Nan looked at it carefully for three seconds.

Then……

Then started to solve the problem directly.

You don’t even need draft paper.

Just because…

This question looks very long.

But the simplicity cannot be simpler.

It is nothing more than looking at issues such as friction, simple harmonic motion, and conservation of energy.

Can’t be said to be old-fashioned.

It can only be said that they have been made and rotten.

untie.

“1: When the small object slides to the right relative to the plate, the sliding friction force experienced by the plate is…

f=μmg.

The direction is to the right.

For flat plates, according to Newton’s second law…

f-kx=Ma.

In the formula, x is the elongation of the bounce, and a is the acceleration of the tablet (to the right is positive).

Let x’=x－umg/k.

From the formula ①②③, -kx’=Na.

visible……”

“2……”

“…”

There was almost no pause.

He solved the two questions in one go.

Then…

This is the last question.

have to say.

There is something slightly in the finale.

Not compared to the previous ones, you can see the answer at a glance, just like sending points, even a fool can pick it up.

And here is the twelfth question.

Jiang Nan thought for a while.

Then……

He has ideas.

After half a minute.

Finish writing and call it a day.

Jiang Nan got up and handed in the paper.

“Jiang Nan?”

The invigilator looked at the name on the paper, and his brows instantly frowned. “You were Jiang Nan, the third high school in the Olympic Mathematics competition two days ago?”

“I have only taken the test for a few minutes now, why can’t I do it?

“…”

For Jiang Nan.

The invigilator of the No. 1 Middle School naturally knew.

after all……

In the past two days, Jiang Nan’s name has been spread very loudly.

but……

Jiang Nan is very good in Olympiad.

It doesn’t mean that it is also powerful in physics.

As for the posture of the so-called champion, it is even more a joke. Most people in No. 1 don’t believe it, so naturally he doesn’t believe it either.

Especially now that the physics competition has just begun, Jiang Nan is about to hand in papers, which is a very obvious proof.

No need to read the test paper.

He can conclude.

Jiang Nan works in physics and is a scumbag.

With a 100-point paper, twelve questions, Jiang Nan scored zero points out of all likelihood, and he couldn’t do a single question.

It’s the so-called…

Abandon the exam.

To this.

Jiang Nan frowned slightly, and said, “Teacher, I didn’t give up the exam, I just handed in the paper ahead of time after I finished it.”

Finished!

He left directly.

There is another chemistry competition in the afternoon.

The weather today is nice and sunny.

When he has time, he also wants to bask in the sun on the lawn, take a break, replenish his energy…regenerate.

“Humph!”

“Arrogant and arrogant, I don’t know what to say.”

“I want to see you, how much can you score.”

The invigilator had a bad impression of Jiang Nan, but he became even more disgusted with it.

However……

When he picked up Jiang Nan’s paper for examination, he was just as stunned as a previous invigilator.

“this……”

“It’s not a blank paper?”

“He really finished it?”

“How can it be?”

“How long is the exam, but a few minutes!”

“Even if he writes scribblingly, he can’t be so fast! Besides…it doesn’t look like scribbling??”

“what?”

“It’s really not random writing. He did the first question right, and the second question was also right. Well, there is also the third question…”

“…”