Special Forces: Class Reunion, I Parachute In A Tank

"Is it really Ling Feng?"

They looked at Ling Feng in disbelief.

Just now, they all answered correctly.

Three different solution ideas, but the final answer is the same.

Moreover, there is no problem with the problem-solving thinking.

Therefore, the correct rate of the answer is very high.

Moreover, their notes were all lent to Ling Feng.

If it wasn't Ling Feng who answered it, who else could it be?

But, isn't he majoring in Army command at the National Wind Science University? Could it be said that the Army also has to study dynamics?

On the podium, Tan Yan was stunned for a moment, and then began to answer.

Although Ling Feng helped him solve the latter answer, the train of thought seemed to be completely correct.

Just not sure, the answer is correct.

But what the heck!

Write it first!

Soon, Tan Yan finished answering.

"The answer is the same as ours, but in a different way!"

"All four of us have different solutions!"

The three people in the audience gasped.

If Ling Feng really answered it, it would be terrible!

They can't even answer one, let alone four!

"Good! That's right!"

Lieutenant Colonel No. 29 nodded in satisfaction, "It seems that you have put your heart into it. This answer is concise and clear, and the idea is completely striven for! Very good! Keep working hard, let's go!"

Tan Yan was overjoyed when he heard the words, "Thank you teacher!"

After speaking, he walked down the stage.

There was bursts of warm applause in the classroom.

But Tan Yan didn't feel much pride, because he didn't solve this question.

When he walked down, his eyes fell on Ling Feng.

Ling Feng smiled at him.

Now, Tan Yan finally confirmed that this question was answered by Ling Feng.

In addition to being surprised in my heart, I admire Ling Feng even more.

This guy, is there anything he doesn't know?

After the lieutenant colonel briefly explained the other ideas and principles of this question, he then explained other questions.

Ten minutes later, I finally started today's new course: the difference between subsonic and supersonic engines.

As we all know, at present, whether it is domestic or foreign passenger aircraft or fighter aircraft, most of them are based on subsonic speed.

There are very few supersonic passenger planes, and not many fighter planes. They are only produced by countries with a relatively strong military, and the number is not large.

But it is undeniable that supersonic aircraft will absolutely rule the battlefield in the future.

All countries are also intensively researching and developing.

On the podium, the lieutenant colonel told everyone the difference between the two sonic engines by projecting videos and pictures.

A group of students kept taking notes below.

Ling Feng sat there quietly and listened.

But after a while, he suddenly felt bored.

The main reason is that what the lieutenant colonel said is not simple, but it is not difficult either.

It's just that he already knows it by heart, and he can quickly learn this knowledge with his eyes closed.

After the lieutenant colonel spoke for about half an hour, he opened a drawing directly.

On the picture, it is a plane flying in the sky.

Then a question and answer question appeared next to it: "An airplane is flying in a straight line at a supersonic speed, but the airflow it ejects is subsonic. Then, viewed from the ground, the airflow ejected by the airplane is moving in the same direction as the airplane. In this case , can the plane continue to accelerate?

The lieutenant colonel asked: "Just now, I analyzed the specific differences between subsonic speed and supersonic speed with you. We have talked about this content a lot before, and today we also made a deeper comparison."

"Then now, let's discuss this question based on the course knowledge we have learned before!"

"Does any student know?"

"Report!"

At this time, a student wearing glasses raised his hand.

"It's Yan Tao!"

"Xueba is different. The teacher can think of the answer just after asking!"

"He is a top student, one of the top ten in the whole department. It's normal to have a quick brain.

When Yan Tao raised his hand, he immediately became the focus of everyone's attention.

And Ling Feng in the audience couldn't help sighing when he saw the title.

This kind of question still needs to be asked, of course it is impossible.

Unless the aircraft does not need the engine to provide power and is pushed by the wind in the air to fly, but this possibility is almost zero.

Even the lieutenant colonel could not help showing a gratified smile, "Student Yan Tao, please answer."

"yes!"

Yan Tao stood up and said confidently: "According to the question given by the teacher, I personally think that it is a test of our understanding of the force of the aircraft.

"So, an airplane moving in a straight line at a constant speed is balanced under lift and gravity, and thrust and drag."

"It can be treated as an inertial system. When the total external force is not zero, there will be acceleration. Therefore, as long as the thrust can be increased, the speed will of course increase!"

"So it has nothing to do with how the engine jets move relative to the ground."

"For example, a rocket engine with a specific impulse of 250 seconds has a nozzle ignition speed of about 2.4 kilometers per second. When the speed of the rocket exceeds Mach 7, viewed from the ground, the ejected gas is moving in the same direction as the rocket. , but this does not prevent the rocket from continuing to accelerate, reaching the first cosmic velocity of 7.9 kilometers per second! Report, my answer is over!"

A group of students felt that it was very reasonable after listening to it, and nodded secretly. Obviously, they also agreed with Shoutao's answer.

Only Ling Feng frowned slightly.

Although this question is not difficult, it cannot be understood through mechanics so superficially, right?

Can such an answer be obtained without counting 697 times?

This guy is really what everyone said, a top student?

Pseudo-scholar?

The lieutenant colonel also nodded slightly, "Very well said!"

Just when Yan Tao sat down happily and satisfied, and the whole class wanted to applaud and encourage Yan Tao, the lieutenant colonel asked again: "Are there any other students who have different opinions?"

This made the whole class startled.

Isn't this the correct answer?

Need to continue asking questions?

Or is there a different answer to this question?

Yan Tao's heart skipped a beat, and he quickly recalled his answer to see if there was anything wrong.

Ling Feng looked around, and everyone including Wu Xiaoxue and Luo Zhen seemed to think that Yan Tao's answer was correct.

When he was hesitating whether to stand up and express his opinion...

Ding!

In my mind, a system voice suddenly sounded: "When issuing a task, the host should take the initiative to ask to answer questions, and study scientific and technological issues with teachers and students in depth. The system will always pay attention to the dynamics of the host. If the host can actively participate in various debate activities Or in other learning activities, when the accumulation reaches a certain number of times, the system will consider rewarding new skills!"

Hearing this, Ling Feng couldn't help but smile wryly.

This system is obvious, I want to pretend to be aggressive!.