Top student: All my teachers are academic whizzes!

For Han Chuan, competing was a completely new experience, like a young woman riding in a sedan chair for the first time.

After all, in his previous life, he was a poor student who barely got into university. He would struggle with difficult problems in his textbooks for ages, and his math and physics grades were practically nonexistent, let alone "high-end" things like competitions.

After taking the test paper from Fang Jianyu, Han Chuan found a chair near the desk and sat down.

Following his usual exam habits, he quickly glanced at the exam paper, his eyes first landing on the title at the top of the paper—2008 Hunan Province National Middle School Physics Competition Semi-final Exam Questions.

After receiving the exam paper and finding a seat, Han Chuan glanced at the paper as he usually did during exams.

2008 Hunan Province National High School Physics Competition (Preliminary Round) Exam Questions

1. Candidates must carefully read this notice before the exam.

2. This test consists of 4 pages and has a total score of 160 points.

3、考试时间，09:00-12:00

.....

Unlike the National College Entrance Examination (NCEE) science comprehensive paper where physics accounts for 110 points, this semi-final exam paper has 50 more points and an extra half hour of exam time.

Moreover, the 160-point exam paper only has 8 questions in total, with no multiple-choice questions or fill-in-the-blank questions, only problem-solving questions.

This is the level of the semi-finals, which is also the intensity of the provincial competition papers.

Unlike the regular college entrance examination, which has multiple-choice and fill-in-the-blank questions that allow students to "roll the dice" to guess the answer and earn a few points when they don't know the answer, this exam is different.

On the stage of competition, strength is the only passport. If your level is not high enough and your grasp of knowledge is not solid, let alone getting points, you can't even answer a single question. It is perfectly normal to get a zero.

In competitions, if your skill level isn't high enough, it's normal to get a zero score.

Han Chuan took a deep breath as his eyes quickly scanned the entire set of test papers, his chest pounding with barely concealed anticipation and excitement.

Since his rebirth, with the help of his cheat code and the two book spirits, Ge Jun and Zhou Peiyuan, his grades in mathematics and physics have improved by leaps and bounds, far surpassing his former self and even the top students in his class.

He couldn't wait to start writing and test his learning progress over the past two months to see what level he could reach.

Gripping his pen tightly, Han Chuan opened the test paper and his eyes fell on the first question.

[Question 1, (5 points) The radiation pulse period of the Crab Nebula pulsar is 0.033s. Assume it is a sphere composed of uniformly distributed matter, the pulse period is its rotation period, and gravity is the only force that can prevent it from disintegrating. The gravitational constant is given as G = 6.67 x 10⁻¹nm³·kg⁻¹·s⁻².]

Since the material on the surface of the pulsar has not been separated, what is the lower limit of the density of this pulsar in kg·m³?

After reading the question, Han Chuan's eyes showed interest.

Generally speaking, the first question on a test paper is often the easiest part.

These are what teachers commonly refer to as "easy points" questions, designed to help test-takers quickly get into the answering mindset and alleviate their anxiety.

This question is no exception.

Although the background of the question sounds very sophisticated, involving astrophysics such as pulsars, it essentially tests the balance between gravity and centripetal force.

"Do you calculate the critical condition under which a pulsar will not undergo centrifugal disintegration?"

Han Chuan glanced at the question but didn't think about it much.

Although it was a provincial competition exam paper, it wasn't too difficult for him, at least not the first question.

The question looks complicated, involving multiple physical quantities such as celestial bodies, rotation periods, and densities.

However, it is actually easy to understand once the physical scenario is simplified and the core contradiction is grasped.

Looking at the question, relevant knowledge points quickly came to mind for Han Chuan.

The condition for the surface material of a spherical pulsar with a given rotation period (i.e., rotation period) not to disintegrate is that the gravitational force exerted by the celestial body on the surface particles is at least equal to the centripetal force required for the particles to rotate with the celestial body.

This is a core knowledge point about celestial motion in high school physics.

Some time ago, when Mr. Zhou Peiyuan was tutoring him, he specifically focused on explaining this type of critical problem and gave a similar example. However, the example at that time was the critical angular velocity of the Earth's rotation, which is exactly the same principle as this problem.

Solving this problem is quite simple. Just list the core formula based on the known physical scenario, and then follow the steps to derive it.

Holding the ballpoint pen in his hand, Han Chuan didn't stop and quickly began answering the questions on the answer sheet.

"Let the mass of the pulsar be M, the radius be R, and a point mass of unit mass m be on its surface. The condition for it not to disintegrate is: G·Mm/R²≥mω²R."

The gravitational constant G is 6.67 × 10⁻¹¹ m³·kg⁻¹·s⁻².

"..."

「代入质量与半径的关係，化简条件....得ρmin=9.4248/7.26×10⁻¹⁴=1.30×10⁻¹⁴kg⋅m⁻³。」

In less than ten minutes, the three sub-questions of the first question successfully filled the entire answer area.

Han Chuan did not hesitate and looked straight at the second question.

Since these are easy questions, there's no need to waste time checking them. The key is to take advantage of your good form and quickly tackle the more difficult questions later on.

The second question is one that appears in the competition almost every year: calculating the orbit of a rocket-launched satellite or the relevant parameters of a lunar orbiter.

This was not difficult for him either.

.....

There were only a few people in the office where evening self-study was held.

Besides the two physics teachers, Fang Jianyu and Wei Jiqiu, there was only one other teacher grading papers in the corner. The quiet environment was no different from the examination room.

Standing behind Han Chuan, Fang Jianyu watched him quickly answer the first two questions, his face filled with anticipation and a smile that unconsciously crept onto his lips.

With a student like this, this year's Physics Olympiad is a sure thing!

He never thought he would make it to the world championships, but he felt it was his duty to make it to the national finals and restore the glory of the county's No. 1 High School!

Meanwhile, Old Wei, who was also standing behind Han Chuan watching him do his homework, looked at him with increasing surprise.

He was already quite surprised when he saw Han Chuan solve the problems on the blackboard.

He can solve a provincial-level competition problem in 10 minutes, which is top-tier even among the physics geniuses in his elite class.

Now, Han Chuan's performance was utterly astonishing, no, it amazed him!

If the problem on the blackboard could be attributed to Han Chuan's familiarity with mechanics when he chose it, which is why he was able to solve it so quickly.

But this exam paper is completely different. It wasn't created by him, but is the actual provincial competition semi-final exam question. It has no specific focus and covers a very wide range of topics.

This exam paper covers almost all areas of high school physics, from mechanics to electromagnetism, then to thermodynamics, optics, and modern physics. It encompasses almost all of high school physics and places extremely high demands on students' comprehensive abilities.

Han Chuan's speed in solving problems remained undiminished, his thinking was clear, his steps were rigorous, and there was not the slightest hesitation. It was as if these knowledge points were already engraved in his bones, which was enough to demonstrate his true strength and was by no means accidental!

......

P.S.: There will be another chapter tonight, please vote with your monthly tickets to read it!