Hey.

It's kind of interesting.

But if you want to stump Fang Chao with just this little difficulty, it's really a bit whimsical.

On the whole, the difficulty of physics cannot be compared with mathematics, mathematics is really extremely tricky, and it can trap Fang Chao for a long time, but in physics, so far, there is still no problem that traps it for more than five minutes, and in terms of Fang Chao's physical level, there is no pressure.

Answer.

Suppose that the compressed air with pressure P1 = 2x10 to the seventh power Pa and the volume V1 = 2 m?, all become compressed gas with pressure P2 = 9.5x10 to the sixth power Pa, and its volume is V2, according to Glass's law, there is P1V1=P2V2.

The volume of compressed air with a discharge pressure P2 = 9.5x10 to the sixth power Pa during drainage, V2' = V2-V1.

Let the pressure at the place where the submarine is located be P3, then the pressure P2 = 9.5x10 to the sixth power Pa, and the volume of compressed air with a volume of V2' becomes the volume of air with a pressure of P3 V3 = 10m?

According to Box's law, there is P2'V2=P3V3

Synact can obtain P3 = 2.1x10 to the sixth power Pa

Let the depth of the seabed where the submarine is located be h, because P3=Po+pgh

H=200m can be obtained.

Get!

"It's not too difficult, it's so-so."

"Forget it, next question."

The next question is electromagnetism.

In physics, small studies can be ions, atoms, ...... And in the big picture, they can even study the universe, the stars, and so on, all of which belong to the realm of physics.

Naturally, physics is also divided into several large categories, such as mechanics, electromagnetism, thermodynamics, relativity, and quantum mechanics.

In addition, there are particle physics, nuclear physics, atomic and molecular physics, solid state physics, condensed matter physics, laser physics, plasma physics, geophysics, biological physics, astrophysics, and so on.

Physical, it exists in all aspects of our lives, even if you sneeze now, it is a physical reaction, even if you are in a space, but there are more than a dozen physical reactions around you.

Now, the physicists are moving towards deeper physics and are beginning to work in condensed matter physics, atomic, molecular, and optical physics, and even high-energy physics, astrophysics, and super-electromagnetic guns.

At this time, the mechanics placed in front of Fang Chao made the corners of his mouth rise slightly.

It's another question to send off.

It's stress-free.

When the contact knife of the double-pole double-throw switch is thrown to 1 and 2, the plate where S1 is located is connected to the negative pole of the power supply......

The radius of the uniform circular motion of electrons in a magnetic field is r1 = d1/2 = 1.0 cm

ev1B=mev1?/r1

eU=1/2mev1?-0

me=eB?r1?/2U

……

r2?=?+d2

r2=73.5cm。

Let the mass of the positive ion be m,

m=eB?r2?/2U

m/me=?=5402

That is, m=5402me=5402/1800mp=3mp

So the atom that makes up this gas has a proton number of 1 and a neutron number of 2, and this gas atom is fluorine, an isotope of hydrogen.

……

Minutes and seconds passed.

Fang Chao's remaining physics questions were already less than two, as long as he completed one more question, then he could directly hand in the paper.

He believes in his physical level, and there is no problem if he gets a score of 148, and the remaining two points are 1 point deducted for fear of pride, and the other point is deducted 1 point for pretending to be too forced.

Fang Chao has strictly controlled his total score between 148~150, so in this physics competition, there are only three options for facing Fang Chao's total score.

A:148。

B:149。

C:150。

As for what the final option is, people like Fang Chao, who are proficient in probability, are not absolutely sure.

People's hearts are unpredictable, and sea water is difficult to measure.

This is Fang Chao's shortcoming, he feels that he should also study psychology if necessary, this kind of thing can definitely come in handy sometimes.

Just as Fang Chao was about to complete the last few steps of the last question, a student in the classroom suddenly stood up.

"Teacher, can I turn in the paper?"

This student is about 1.72 meters tall, with black-framed glasses, a little chubby, probably caused by long-term lack of exercise, some acne left by youth on his face, and even from his body, Fang Chao couldn't see any dazzling light at the beginning, but who would have thought that such an inconspicuous person in Fang Chao's eyes would actually hand in the paper before him, and he still had a small part that he hadn't completely answered, but the other party had already reached the point of handing in the paper.

At this moment, the figure of the other party suddenly became majestic.

There are people outside the world, and there is a sky outside the sky!

Sure enough, there are still strong people in this world.

I thought it would be the top of the mountain, and I could see the mountains at a glance.

But I didn't expect that my mountain is not the highest mountain in the world.

The other party's mountain is still above me, and I am here to watch the scenery, and the people watching the scenery are watching me from upstairs.

Hey~

It's interesting~!

At this moment, Fang Chao came up with the idea of getting to know each other.

After the invigilator heard the other party's words, he glanced at the time, half an hour had passed before the start of the exam, and he could hand in the paper in advance, and immediately he came to the other party, and then asked, "Are you sure to hand in the paper?" Don't check it again? ”

"No need for the teacher."

"Alright then, pack your things and leave to go outside the classroom, don't disturb the normal exams of other candidates."

"Yes."

"Mom, you're pretending to be too forced, aren't you? The physics competition took more than 40 minutes to hand in the papers? I definitely didn't get it all right, so I did some multiple-choice questions, I guess ......."

"It's for sure, where is the physics competition so easy, pretending to be a ...... that is easy to be struck by lightning"

"I'll see what his final results are, and I still want to pretend to be forced, don't pretend to be forced when the time comes."

"Leave him alone, take care of yourself first, there is not much time left, although there is still more than an hour, but can you really do one in ten minutes for the next answer?"

"it!!"

“……”

Some candidates saw the glasses man hand in the paper early, and they were all guilty in their hearts.

Fang Chao took advantage of this short time of a few minutes to quickly answer all five questions, which took two minutes, and then he also stood up and said, "Teacher, I also have to hand in the papers." ”

The invigilator frowned and asked, "You also handed in the papers?" ”

He didn't want so many students in his invigilated class to turn in early, after all, physics is rigorous, no matter how good you are, how many points can you get if you turn in early? Do you really think you're a genius? Or do you think any of you have a perverted fierce guy like the IMO event?

Fang Chao nodded, "Hmm." ”

The invigilator said, "No more inspections?" ”

Fang Chao said: "No need. ”

"Okay, if you want to hand in the papers, you can hand in the papers."

Fang Chao handed over the test paper, and seeing that the man with glasses was about to leave after packing his things, Fang Chao hurriedly stopped the other party, "Brother Tai, please stay." ”

He hasn't packed his things yet, how can he watch the other party leave.