1900: A physics genius wandering around Europe

Chapter 385: Power, heat, light, sound, all failed! Genius failed! China is undefeated!

As Wilson patrolled the classroom, he noticed strange looks on everyone's faces.

Then, a smile appeared on his face.

"Haha, you guys are really unlucky."

"Bruce himself set the questions for the competition."

"It would be strange if you could answer the questions smoothly."

"Now you are all confused by the last question."

Wilson had the same expression when he first saw this question.

Under Li Qiwei's guidance, the instructors, including him, finally understood the strangeness of this question.

In just one sentence, there are three key words.

"Absolutely smooth", "spherical", "rigid body".

Students must fully understand these concepts before proceeding to the following analysis.

First, absolutely smooth.

This means that there is absolutely no friction on the surface of the object.

That is to say, if you touch the sphere with your hand, it will not have any impact on the sphere.

That is, it is not possible to determine whether a spherical rigid body is rotating by applying force.

Second, spherical.

This means that it is impossible to determine whether it is rotating based on its visual movement pattern.

Third, rigid body.

Rigid body is an imaginary concept in physics.

Its definition is that when an object is in motion or subjected to a force, its shape and size remain unchanged, and the relative positions of its internal points remain unchanged.

Absolute rigid body does not exist in reality, it is just an ideal model.

Note that it is very easy for ordinary people to make mistakes when it comes to the concept of rigid body.

An object that is considered "hard" is a rigid body.

For example, steel will not deform even if you hit it hard.

So steel is a rigid body.

However, this is wrong.

Even if you tap steel lightly with your hand, it will still deform.

It's just that the degree of deformation is so small that it cannot be detected by the naked eye.

As long as it is a system or substance composed of molecules or atoms, it will be deformed.

Because there are forces between molecules.

This is the basis of material deformation.

A rigid body can be imagined to be made up of a whole piece of "material".

It is a whole, without any molecules or atoms inside.

Let me give you a vivid example.

A spring will compress if you press it lightly.

When you release your hand, the spring will rebound.

This is our objective world, the law of material deformation.

But now, this spring is solid, and it will not deform if you press it with your hand.

This is the concept of a rigid body.

If an object has the properties of a rigid body, then it will have many interesting properties.

It can be said that understanding the concept of rigid body is the key to answering the third question.

Wilson thought about this in his mind and smiled slightly.

His eyes were still casually observing everyone.

suddenly.

Wilson saw a student to his right, writing frantically.

He looked carefully and saw that the place to answer the question was exactly where the third question was.

There was a huge shock in his heart.

"Oh my God, has anyone figured this out so soon?"

"Looking at his appearance, he is actually Asian."

"This is indeed a place where hidden dragons and crouching tigers are hidden."

Wilson was intrigued by the success.

However, he was the invigilator and could not show obvious expressions or movements.

So he walked calmly to the student and pretended to look at the other's answer casually.

At this moment, Brother Fried Fish was writing furiously, muttering to himself.

"Hehe, I'm afraid no one would have thought that I would use four methods to solve this problem."

"Everyone else uses one method, but I use four."

"Then maybe I'll get extra points."

Brother Fried Fish was full of confidence, as if everything was under his control.

Wilson was also a little bit unconvinced.

"There are four solutions to this problem?"

"You're even more awesome than Bruce."

He just looked at the test paper.

【Solution 1: Thermodynamic method. 】

"Use a heating device to heat a fixed point on the object."

"Then touch that spot with your hand."

"If the temperature rises where you touch it, it means the rigid body is not rotating."

"If the temperature does not change where you touch it, it means the rigid body is rotating."

【Solution 2: Optical method】

"Send a beam of light toward the surface of the sphere."

"If the sphere is not rotating, it is a normal reflection."

"If the sphere rotates, the reflected light will be scattered."

【Solution 3: Electrical method】

"."

【Solution 4: Acoustic method】

"."

After reading Fish Bro's first solution, Wilson stopped reading.

Because it's all wrong.

This Asian boy didn't understand the meaning of rigid body at all.

"Ah, I thought a true genius would appear."

The four methods used by Fried Fish Brother are useless for rigid bodies.

Because a rigid body is not composed of molecules and atoms, its interior does not vibrate when heated.

That is, heating has no effect on rigid bodies.

Similarly, physical means such as electricity, light, and sound must interact with rigid bodies in order to achieve the purpose of measurement.

But rigidbodies cannot interact with them.

Rigid bodies have only kinematic properties.

For example, you pour a bottle of paint onto a rigid body.

Then, because there is no friction, the paint will neither stick to the rigid body nor be splashed when the rigid body rotates.

The paint will just flow down normally.

It's the same whether it rotates or not.

So it is impossible to distinguish.

Rigid bodies also cannot conduct electricity and light.

Therefore, all the above methods are invalid.

This is also the trap in the third question.

Once you don't have a deep understanding of the properties of rigid bodies, it's easy to think of these "feasible" methods.

Wilson walked away quietly, expressionless.

Leaving behind Brother Fried Fish, he was secretly delighted. He was already imagining the scene after winning the first place.

Wu Youxun, Irena, Lancher and others saw Wilson standing next to Brother Fried Fish and stopped for dozens of seconds.

I was shocked.

“Is there really a super genius on the Philippine team?”

Generally speaking, if the invigilator stops at someone's position, it means he or she is attracted to that person.

There are two situations, either too bad or too good.

But from Wilson's expression and actions, no one could guess what was going on.

This is also something Wilson deliberately maintained, otherwise it would be unfair.

Therefore, Wu Youxun and others stopped thinking about it and decided that the most important thing was to find a way to solve the problem as soon as possible.

They are the strongest people in this competition.

After getting the test paper, I quickly understood the key to the third question.

Absolutely smooth and spherical, these two conditions are simple.

Every one of the 80 contestants present knew that touching with hands was definitely not allowed.

So, the key is rigid body.

This concept, hypothesized by physicists, is a very important analytical model in mechanics.

Traditional sound, light, electricity and heat are meaningless for measuring rigid bodies.

As true genius elites, Wu Youxun and his colleagues have a deep understanding of the physics concept of rigid body.

But a deeper understanding can only let them know that traditional methods are not feasible.

So what would the real answer be?

For a moment, several people fell into deep thought.

Now, in the huge classroom, the only sound you can hear is the rustling sound of the pen tip rubbing against paper.

Most of the contestants gave up on the last question.

Because it is not easy to get the first two questions right.

Instead of wasting time on the last question, it is better to do the first two well.

Maybe in the end, no one will be able to answer the last question.

Then the competition will depend on the results of the first two questions.

At this moment, everyone felt that this Physics Olympiad was full of thrills and excitement.

It tests the players’ abilities, but it tests their mentality even more.

Especially the top few ones.

They are the most entangled now.

In front of us was the Filipino fish frying team, smiling crazily, and no one knew whether they had succeeded or not.

But the pressure is enormous.

Ye Qisun's hands were even sweating.

Later, most of the other players gave up directly. Such a decisive strategy is really admirable.

Although the first two questions are also difficult, at least everyone can start writing.

It's just the difference between getting one point and five points.

And by giving up the last question, there would be more time to do the first two questions. Although there were differences in the abilities of the students present.

But everyone is still top talent.

As long as you give them time, they will eventually write it.

So, the game has reached the most critical moment.

One minute
three minutes.
five minutes.
Irena struggled for ten minutes.

She gave up.

She really couldn't find the answer.

This spherical rigid body does not interact with any matter at all, so how can it be measured?

At this moment, she had not yet completed the first two questions.

She was thinking about the last question while doing the questions.

"Forget it, it seems I'm still not good enough."

"I thought I always ranked first in my class, so I was confident about this competition."

"Now it seems that I still need to work harder."

"But, Uncle Bruce, after the game is over, I will definitely go and ask you for the answer in person."

"hey-hey."

Einstein happened to see Irena's expression at this time.

He immediately understood the other party's choice.

I have to say that this little girl is also very courageous.

He did not look down on Irena for this.

Because this question is indeed "beyond the syllabus".

Of course, strictly speaking, it is not beyond the scope of the syllabus.

"Irena, you probably can't imagine it."

“Even among the teachers from various national delegations, only two people were able to solve the last question in the first place.”

"One is me, the other is Bohr."

“The rest only became clear to me after Bruce’s prompting.”

"The calculation difficulty of this problem itself is not great."

"As long as I think about it, maybe fifteen minutes is enough."

“The key is whether there is a way of thinking outside the box.”

"If you keep focusing on rigid bodies, you will never be able to come up with the answer."

Thinking of this, Einstein smiled.

It was so joyful when these instructors were discussing together.

Finally, Bohr said:
"Only the first Physics Olympiad could have such questions."

“Because no one is familiar with it.”

"I think in the next few classes, this kind of question may become a basic question."

Einstein agreed with this.

Therefore, he believes that future Physics Olympiads will become increasingly difficult.

Because the question types have been asked before, there is not much point in asking them again.

So the question setter has to rack his brains.

Later, at the suggestion of everyone, the date of the Physics Olympiad was changed to every four years, the same as the Olympic Games.

The reasons given by everyone are very sufficient: too frequent competitions are not conducive to innovation in questions.

Li Qiwei thought about it and realized that this was indeed the case.

At this time, it is indeed not suitable to hold competitions at a high density.

In 1918, the war in Europe was not over yet.

Therefore, the date of the second Physics Olympiad was changed to July 1920.

At this time, there was only half an hour left until the end of the game.

Einstein had walked around for several times, but couldn't find anyone who could answer the third question.

"It looks like the whole army is going to be wiped out."

"Haha, but I understand."

"It's the first time after all, it's normal that I can't solve it."

"Next time I will definitely be able to untie it with one hand."

Suddenly, Einstein discovered that an Indian boy looked happy.

The smell of curry is very impressive.

So, like Wilson, he inadvertently leaned over.

At this time, Rancho still acted indifferent, which made his teammates anxious.

However, as he liked to let his imagination run wild, his brows soon relaxed.

"Huh? Got it!"

"If we can change the question a little bit, maybe we can solve it."

That’s right, the bold Rancho actually changed the question directly.

To him, the match was just a game.

Since it's a game, you can't be led by others.

Perhaps changing the title is the hidden condition?
"Suppose there are two identical balls."

"One rotates, and the other doesn't."

"Now, suppose that the two balls have their own axes of rotation."

"Then according to mechanical analysis."

"If the sphere is spinning, like a gyroscope, it's much harder to bend the axis."

“This way you can tell whether it’s rotating or not.”

At this moment, Einstein didn't know whether to laugh or cry.

He didn't know how to describe the Indian player.

The other party's idea is even more imaginative than this question.

"But even if you change the question, you still have loopholes."

"How do you do this?"

"Even if it has a rotating axis, it still cannot exert force."

“So, it’s not rigorous enough.”

"However, being able to think of this is already good enough."

So Einstein stopped watching.

The other party's answer may be scored 0.5 points.

During the initial discussion, the team leaders developed very detailed and strict scoring criteria, accurate to 0.5 points.

Einstein sighed.

"This should really be the end now."

"It will soon be too late."

However, miracles always happen at the last moment.

There is still one person who hasn't given up!

At this moment, Wu Youxun had finished the first two questions.

With a solid foundation, he solved the first two questions very easily.

Both calculation and formula derivation are his strengths.

Of course, Wu Youxun thought to himself that it would be a bit difficult to get full marks on these two questions.

But now, he no longer cared about perfection and checked it carefully.

The last question is his goal.

"I guess no one can solve the last question now."

“And that’s my hope.”

"If I want to represent my country and surpass the West, I can't just rely on the first two questions."

"Even if I get full marks, it doesn't matter. Essentially, there is no difference at all."

“So, I can’t give up.”

"This time, I want the world to know China again!"

Wu Youxun cheered himself up frantically, and even his blood began to boil.

His heart was beating strongly, as if some seal was being lifted.

The power of the Yanhuang bloodline!
wake!

But he was terrifyingly calm at this moment.

Wu Youxun seemed to be in a dark and silent void.

He had no body, no senses, just a floating mass of thoughts.

In front of his consciousness, no, there was no concept of up, down, left, right, front, or back in this void.

A sphere emitting silver-white light is quietly suspended.

It seems to have existed forever.

I don't know whether it is rotating or still.

Wu Youxun's thoughts moved around the silver ball of light.

The light of wisdom bursts out.

"It can now be confirmed that this ball will not interact with any substance."

“How do you measure it then?”

"In this space, apart from me, nothing else can affect the ball itself."

"But there must be an answer to this question."

"With the principal's vast wisdom, he will definitely leave a glimmer of hope in places no one would expect."

"What exactly could it be?"

It seems that there is no concept of time in this space.

Thinking Wu Youxun didn't know how much time had passed.

But at this moment, he didn't care at all.

All the light of will is concentrated on the silver ball.

suddenly!

hum!
There was a slight sound, as if the space was vibrating, which suddenly startled Wu Youxun's mind.

"How could there be any sound?"

"No!"

"wrong!"

"No! No!"

"Besides me and the silver ball, there is a third thing in this space."

“It went unnoticed by me.”

"Correct!"

"correct!"

"Hahaha!"

"I understand!"

“I know the answer!”

boom!
Wu Youxun opened his eyes!
The eyes are piercing!

(End of this chapter)