Is it possible to achieve an externally rotated serve in reality?

Judging from today's major tennis professional competitions at home and abroad, only a few top professional players can play the kind of serve effect in anime.

The external spin serve, in tennis terminology, is known as the side topspin serve!

To put it simply, it is a normal serve with a huge spin that suddenly bounces into the opponent's face after a strong spin on the ground.

Of course, it's almost impossible to play with the kind of massive power that you have in anime. The tennis ball itself is spinning, and if you add a lot of force, even Nadal, a super spinner, can't control the direction of the tennis ball. If it's a coaxing out-of-the-box serve and goes straight out of bounds, it's funny!

In fact, the external rotation serve generally plays a role in deterring the opponent on the court.

Let your opponent know how awesome you are, even with such a tricky serve as an outspin serve.

If you really can't get it, it's better to serve honestly.

And Cheng Nuo, who aspires to become the "Prince of Tennis". The Prince of Tennis's unique way of serving, you must show it.

............

The height of the tennis ball is 258 meters, the diameter is 254 cm, the weight is 528 grams, and the elastic deformation is 0559 cm......

The jumping height is 2035 cm, the swing direction is 4558 degrees north-east, and the force is 542 N......

Cheng Nuo's eyes flow data.

A set of data that is combined into the best shot scheme.

The onlookers just saw that Cheng Nuo threw the tennis ball high with his left hand. Then, the whole body jumped upward, the toes were off the ground, and the right hand swung the racket vigorously.

The racket hits the tennis ball head-on.

Like an instantaneous cannonball, the tennis ball shoots at a speed that is difficult to catch with the naked eye, towards the opposite court.

The ball speed is 5025 km/h, and the rev is 584 rpm......

Estimated landing location: 028 meters away, 58 degrees west-south.

Estimated landing time: 085 seconds!

Perfect serve!

After Cheng Nuo saw this set of data in his eyes, he couldn't help but express his satisfaction with this externally rotated serve.

In reality, the reason why top professional players can't play the perfect strength of the outspin serve is that it can't guarantee that tennis can have extremely high spin speed and can accurately control the direction of the shot.

But these do not seem to be a problem for Cheng Nuo, who can accurately grasp the data.

So......

The first perfect externally rotated serve in the real world appeared at a small academy team selection tournament on the Tsinghua campus!

Bang——!

The onlookers only felt a flash of green light in front of their eyes,

Then came the heavy thud of the tennis ball hitting the ground.

The tennis ball, which spins with great power, does not stop spinning after hitting the ground.

Instead, after rubbing against the ground for a few tenths of a second, it bounced hard in a certain direction with a strong rotational force.

And the direction of the rebound of tennis is the direction in which Cheng Nuo's opponent, the boy with glasses, is standing.

And he ...... There was no time to dodge.

Shout-!

The tennis ball flew past his frame. distance, less than a centimeter.

These data are all calculated by Cheng Nuo, and the error is extremely small.

Phew——!

The bespectacled boy exhaled heavily, and fine beads of sweat were already oozing from his forehead.

He raised his head and looked at Cheng Nuo with a look of shock in his eyes.

"Outsidespin serve!This is an outsidespin serve!!"

Among the onlookers, a sophomore boy pointed at Cheng Nuo and said loudly in a shocked tone.

Cheng Nuo put the tennis racket on his shoulder, put his left hand in his pocket, and smiled faintly, "Little meaning." ”

"The more I promise to go forward, how can I be in vain!"

............

As soon as Cheng Nuo's external rotation serve came out, there seemed to be no suspense in the in-hospital trials.

Cheng Nuo's opponent didn't even have the courage to fight with Cheng Nuo, and directly announced his abstention.

In this way, Cheng Nuo and nine other team members together formed the SME tennis team. Compete in a school tennis tournament that will be held in about two weeks.

The tennis team's training is held every three days.

Cheng Nuo is taking two professional courses while preparing for a tennis match.

Since Professor Lu has agreed to Cheng Nuo's application for exemption, Cheng Nuo can skip all the advanced math courses.

Of course, exemption from listening does not mean exemption.

You don't have to listen to the class, but you still have to take the exam.

Professor Lu told Cheng Nuo that if his final high math score could not be ranked in the top 10 of his major, then Cheng Nuo would not want to skip a single section of his high math class in the next semester.

As for the exam of the mathematics department, strictly speaking, Cheng Nuo is still a student who is still a classmate. Cheng Nuo just wanted to participate, but he didn't seem to be able to participate.

In this regard, Cheng Nuo expressed great regret.

............

"Cheng Nuo, tell you good news!" The night before the tennis match, Cheng Nuo suddenly sent a message from Wang Genji's QQ.

Cheng Nuo quickly replied, "Is there any progress on the subject?"

After careful calculation, it has been almost a month since Wang Genji got the first part of the project written by Cheng Nuo.

But Wang Genji's side, like an infertile little daughter-in-law, didn't have any news. Let Cheng Nuo, the husband, ahh

Now that Wang Genji said that there was good news, Cheng Nuo's first thought was that the subject had progressed.

Wang Genji said haha, "Uhhaha...... We will discuss the subject matter later. What I want to tell you about today is about my paper?"

Cheng Nuo: "A Class of Linear Random Differential Equations?"

Wang Gengen: "Yes, this is the paper. Three days ago, I submitted my overhauled paper again to Eikook's Applied Atheatis Letters. ”

"Just now, I received an email from the review editor. Do you know what it is?"

Cheng Nuo typed with the slightest interest: "I don't know." ”

&Ah!!h

Over there, Wang Genji looked very excited.

It was not sent back again for major repairs and minor repairs.

This time, Wang Genji went directly to the draft!

"Aha!!Directly through!!This is the treatment that only the big people in the academic world can enjoy!!It's so cool!"

Cheng Nuo: "Oh. ”

"In this case, I have two SIs in my pen, and when I apply for the insurance research, the chips will be much bigger. ”

Cheng Nuo: "Oh, congratulations. ”

Wang Genji: "Cheng Nuo, don't keep it, this matter, and your business!"

"Me?" Cheng Nuo didn't understand, "What does it have to do with me again?"

Wang Genji: "I am not alone in the authorship of that paper. ”

Cheng Nuo seemed to have guessed something in his heart.

Wang Genji didn't say anything more, just sent a document to Cheng Nuo.

The documents are papers that have been confirmed to be included in SI journals after Wang Genji's overhaul.

Open the paper. In the column of the author, the names of two people are impressively written:

Wang Genji, Cheng Nuo!

Co-signed!