Su Wangting felt that he had finally pulled back the game, and his face showed a smile again, happy like a 700-month-old child.

The corners of Zhou Jingming's eyes couldn't help twitching, this Professor Su, is it really a pot that can't be opened, because of the ugliness of his handwriting, I don't know how many times I have been ridiculed by my roommate, obviously I am already a college student, but the words I write still look like a primary school student.

Zhou Jingming didn't pay attention to it before, anyway, as long as the words he wrote could be recognized, he didn't expect to be a calligrapher. But now that he was brought out by Su Wangting in front of so many people, Zhou Jingming also smiled embarrassedly, but for this Professor Su, Zhou Jingming liked it more and more.

"Ahem, I'll go on. Zhou Jingming coughed dryly, to hide his embarrassment.

"Well, can you ask, why is the air at the top of the car flowing faster than the bottom of the car?"

Zhou Jingming looked up, and he didn't know when, there were so many people around him at once, but all the teachers in the office surrounded him without exception.

can make Professor Su not understand the knowledge, these teachers also want to see, and more importantly, they want to know if Zhou Jingming can say anything.

Where have these teachers been exposed to dynamics-related courses before, a very simple knowledge point in later generations may be a blind spot for them.

The teacher's question just now can be said to have asked the voices of many people, and they really can't understand why the speed above is faster than the lower part of the same air current?

"To put it simply, because the top of the car has a raised arc, and the bottom is basically a straight line, in the same amount of time, when the air flows over the top, the stroke is an arc, which must be longer than the straight line flowing through the bottom, and the speed is naturally faster. ”

Zhou Jingming explained with a smile.

Everyone suddenly realized that it was such a simple truth, and this time, everyone's gaze at Zhou Jingming became even more different.

And Su Wangting, who was standing on the side, also appreciated Zhou Jingming more and more, no matter where Zhou Jingming learned these knowledge points, he could explain them so clearly and clearly, it proved that he was definitely not a paper tiger, and he had real ink in his stomach.

As the chief expert of the Agricultural Machinery College, not only in the Runzhou Institute of Technology, but also in the Ministry of Machinery Industry, Su Wangting is a very authoritative existence, and the humility and loftiness of the scholar are vividly reflected in his body, but at this moment, in the face of Zhou Jingming, he gave birth to a heart of love for talent for the first time.

Such a good seedling, it's a pity not to do academics.

Not only Su Wangting, but the rest of the teachers in the office were also impressed by Zhou Jingming at the moment, obviously it was the first time to hear this knowledge, but Zhou Jingming could always make them understand in the most appropriate and simple way.

But Zhou Jingming didn't know what these teachers thought, and the initial restraint and timidity slowly disappeared over time.

"In this way, we can officially deduce the amount of air resistance experienced by the car while driving. As he spoke, Zhou Jingming skillfully wrote this formula on paper.

"Cd here is the air resistance coefficient I mentioned earlier, generally speaking, it is a function of the Reynolds number Re, but when the dynamic pressure and speed are high and the corresponding gas viscous friction is small, Cd does not change with the change of Re. ”

For the sake of understanding, Zhou Jingming explained the meaning of each letter in the formula.

"Finally, after a series of calculations, the air resistance of the car can be simplified into this form, Fw=Cd.A.u2/21.15, this is the final announcement we want to derive, and here, the air resistance coefficient Cd is the most critical, do you understand these derivation processes?"

As he spoke, Zhou Jingming deliberately circled the "CD" and said without raising his head.

Zhou Jingming spoke very devotedly, and at the same time, he spoke quickly, as if he had returned to the time when he gave lectures to college students in the past.

Those teachers stared at each other with wide eyes, and they all shook their heads helplessly, what Zhou Jingming said was too fast, and they didn't understand many places.

When Zhou Jingming was explaining, the kind of confidence that was inadvertently revealed made these teachers have such an illusion that the young man in front of him is a teacher who is rich and rich, and they are also fully integrated into the role of students!

It's like going back to the old days of reading.

The roles are perfectly reversed!

Zhou Jingming smiled bitterly, although he was reborn, he was in a high position in his previous life, whether it was the tone of his speech or the way he did things, he would always be affected unconsciously.

"Can you tell me how this 21.15 came about?" Su Wangting frowned, he could understand the previous deduction, but when such a number suddenly came here, he couldn't understand it.

"The specific operation is relatively annoying, Professor Su, you default to him as known first, and then you will have time to ...... later."

"It's okay, I have time, and I'm not afraid of trouble. Before Zhou Jingming finished speaking, Su Wangting said like this, looking very serious.

Zhou Jingming rubbed his temples with a headache, I know that you are not afraid of trouble, the key is that I am afraid of trouble!

But Zhou Jingming also knew that if he didn't serve Professor Su comfortably today, he wouldn't want to walk out of this door. So he had no choice but to repeat the entire derivation process.

Can you imagine what it's like to be surrounded by a group of seniors over 50 years old when you're only 18 years old?

It's not hard, Zhou Jingming is experiencing this now, it's like he is teaching a class to the "children" of an elderly university.

In this way, it is not easy to further reduce the A value in the formula because of the limitation of the passenger space, so reducing the Cd value is the main means to reduce air resistance. ”

Su Wangting half-squinted, as if he had discovered a new continent.

"That is to say, the Cd value is as small as possible, theoretically, if the air resistance coefficient is reduced to zero, then the air resistance will be gone! In this way, the power of the car will be greatly improved! In this way, the level of China's automobiles will definitely be able to catch up with the United States!"

The more Su Wangting spoke, the more excited he became, and he couldn't wait to put such a vision into practice immediately, and Zhou Jingming, who was closest to him, bore the brunt of the first wave of saliva.

Although what Su Wangting said is not very practical, the intellectuals of this era are very pure in their pursuit of technology and knowledge, and worrying about the country and the people is the main theme.

Unlike later generations, when technology and knowledge were reduced to tools of money, and intellectuals became "refined egoists", the academic atmosphere was not pure, and how could technological progress begin?

Zhou Jingming doesn't think there's anything wrong with chasing profits, but in comparison, he still prefers this academic purity and ideological innocence in the 80s.

Thinking about it this way, he felt that Su Wangting was even more cute.

Because of his excitement, the old professor's face flushed, and he suddenly grabbed Zhou Jingming's shoulder, "Boy, follow me!"

Such a sentence in the market immediately made Zhou Jingming dumbfounded, what the hell, what about the good Qinggao? What about the arrogance of intellectuals?

The noble image that Su Wangting had just established in Zhou Jingming's heart collapsed in an instant.