The principle of this question is the isothermal process, Boyle's law, and if you master the principle and be proficient in using practical skills, this question is very simple. Ranger asked for the answer, 34mm, choose B.

None of the five multiple-choice questions are difficult, and Lan Jie's choice is:

B

A

AB

B

BD

There is a phenomenon worth paying attention to, in recent days, whether it is an internal examination or a national subject competition, B has become more and more favored, while the former darling C has been targeted, isolated, and beaten into the cold palace.

Fill-in-the-blank question 1 is: A Kepler telescope has a barrel length of 62 cm, the telescope can distinguish two engraved lines at an interval of 1 mm on the surface of an object 100 m away, and when the eyepiece diameter is 2 cm, the field of view of the telescope is ____.

Is this question intimate or familiar?

Lan Jie worships Tang Xiaoyun so much, Mr. Tang's mana is boundless, Mr. Tang even bet on the specific parameters correctly, not a millimeter is bad!

The improvised Kepler telescope assembled in the physics lab class had been kept under the bed in his bedroom.

You don't need to calculate this question, just write the answer and you're done.

The FOV is 55.4', which Ranger fills in the blanks.

To be reasonable, it is not difficult to calculate the optical problem seriously.

However, the physics teacher accurately bet on the real questions of the competition, which super boosted the morale of the students!

Who is behind the scenes of our third and third shifts?

It's Grand Master Tang Xiaoyun!

We fought in the exam room, and Master Tang cast spells on the sidelines!

Lan Jie, whose morale was greatly boosted, fought all the way to the big axis with the momentum of destroying the withering and decaying.

The whole exam paper, what is really difficult is this big axis calculation question.

Of all the archmages Lan Jie knew, none of them had hit this great shaft.

So I had to rely on myself.

Question 16: The photon rocket flies to the center of the Milky Way, and the distance between the center of the Milky Way and the Earth is known to be R=3.4×10^4l.y. (light years). The rocket accelerates uniformly with acceleration a'=10m/s^2 in the first half of the journey, and decelerates with the same acceleration in the second half of the journey. The stationary mass of the rocket when it arrives at its destination M0'=1.0×10^6Kg, just ask: how much power does the rocket engine need at least when it starts launching?

'That's a really hard question!'

Lan Jie frowned, realizing that this question was not simple.

Don't rush, take your time, and sort out your head little by little.

First of all, we need to figure out what a photon rocket is.

The engine of a photonic rocket converts the mass of a fuel substance into light radiation energy, causing the photon beam to be ejected backwards away from the rocket, giving the rocket forward momentum. If this product is mass-produced, it can fly infinitely close to the speed of light.

The hypothetical promise winner is sometimes outrageous, but there is no way, people are the promise winners, and other people's imaginary products can appear on the physics test papers of high school students justifiably, and they are also big axis questions.

Lan Jie is a very assertive high school student, and he thinks that it is impossible for a photon rocket to be made by humans, and even if a future human makes a photon rocket, this thing will not make sense.

What kind of rocket is it, isn't it fragrant to open the portal directly?

However, the premise of this question is such that Ranger admits in good conscience that it is possible to develop a photon rocket, so this is a problem with relativity.

'Yes, special relativity!'

After a short period of entanglement, Lan Jie naturally smoothed out.

According to the kinetic law, dp'/dt=Ma' can be obtained.

According to the special theory of relativity, a coordinate system can be established at any time t to attach to the rocket. According to the mass-energy formula, Ma'=-cdM/dt is obtained.

Then there's the extremely complex math calculations.

'It's so complicated!'

Lan Jie has been counting all the time, and his fingers are swollen!

I have to say, regardless of whether it is an imaginary or a real idea, the theoretical system and engineering quantity are placed here, and it is not easy to design a rocket!

'Whew...... It's finally been figured out!'

Lan Jie stared straight at the answer he calculated, the starting power of the photon rocket is N=3.8×10^24J/s.

"Huh, such an awesome hypothetical black technology product, the starting power of the engine is only so little?"

Ranger remembers very well that when the first atomic bomb exploded, it released about 5×10^23J of energy in 10^6 seconds, and the power was about 5×10^29J/s.

Compared to the atomic bomb, the photonic rocket flying to the depths of the galaxy is a small-displacement domestic economy?

Lanjie double-checked every calculation step, no problem, I didn't miscalculate, it was 3.8×10^24J/s.

'Big Brother Physics, is my answer correct?'

'Exactly, huh?'

Well, okay, don't rush to hand in the papers, and let me savor it for a while. ’

Some of the promise winners may be outrageous, but the physics big brother is absolutely reliable.

Ranger reviewed each question from beginning to end, and did it all over again.

In this preliminary competition, there is no room for error.

Lan Jie checked and checked, checked and checked, until the bell rang.

'Handed in the papers, handed in the papers again, this time, it shouldn't fail, right?'

Lan Jie sat in his seat, waiting for the invigilator to collect the papers.

The invigilator came to Lan Jie and took away the papers.

Lan Jie pleaded: "Teacher, please be kind to my papers, it is not easy for me, and it is not easy for the papers." ”

"It's rare to have a rest day, and I'm a geography teacher to invigilate the physics exam, and it's even more difficult for me!" The invigilator made a gesture with a cold face, telling Lan Jie to leave quickly.

"Hey, it's hard. Lan Jie left the examination room, his mood relaxed, but heavy.

"Hey, Brother Jie!" Wu Zihan chased after him, his state was extremely happy, and it seemed that the answer was smooth.

"Zihan, did you do well in the test?"

"Brother Jie, is the last question 3.8?"

"Well, yes. ”

"It's not 10 to the 24th power. ”

"That's right. ”

"Yay!"

"Why don't you talk about the first fill-in-the-blank question?"

"I was about to say this question, Mr. Tang is really too good! There are many teachers who bet on the type of question, and even the teachers who are all in the specific parameters, that is God! It's a pity, it's a pity, there are not many scores for that question, if you can bet on the big axis question with the highest score, it would be great. ”

"Teacher Tang didn't bet on the big axis question, Zihan, didn't you do it right. ”

"My answer is the same as Brother Jie's, the answer should be correct, but I can't guarantee that I will get all the process points. Anyway, the last question is super difficult, and the calculation process is so complicated, I used all my strength to barely find the 24th power of 3.8 times 10. ”

In the midst of the surging crowd, Lan Jie looked around: "What about the other brothers? I remember that Zixuan, Zihao, and Haoran also took the exam here, right?"

Wu Zihan took out his mobile phone, and he said, "There are too many people, I can't find them, I'll take a look at them?"

Lan Jie nodded and said, "Well, Aite, these brothers from our Yueshan District Test Center will have a light meal together at noon." ”