Chapter 257

Can external spin serve be realized in reality?

From today's domestic and foreign major tennis professional competitions, only a few top professional players can play the kind of service effect in animation.

Outside spin serve, in the professional terminology of tennis, is called the side inside up spin serve!

To put it simply, it's a general serve plus a huge spin, so that after a strong spin on the ground, it suddenly bounces to the opponent's face.

Of course, it is almost impossible to play the kind of great power in animation. The tennis itself is spinning. If combined with strong strength, even Nadal, the super spinning maniac, can't control the direction of tennis. In case a bull force out spin serve, directly be sent out of the bounds, that's funny!

In fact, the external spin serve in the field is generally a deterrent to the enemy.

Let the opponent know how strong you are, even if you can serve such a tricky service.

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

And Cheng Nuo, who is determined to become the "Prince of tennis". The tennis prince is the only way to serve, he must show some.

…………

The height of the tennis ball is 2.58M, the diameter is 2.541cm, the weight is 56.28g, and the elastic deformation is 0.559cm

The jumping height is 20.35cm, the swing direction is 45.58 degrees north by East, and the force is 154.26n

Data flow in Cheng Nuo's eyes.

A set of data, combined into the best hitting plan.

The onlookers just see that Cheng Nuo throws the tennis ball high with his left hand. Then, the whole body jumps up, the toes off the ground, and the right hand swings the racket.

The racket hit the tennis ball head on.

Like an instant shell, the tennis ball shoots at the opposite court at a speed that is hard to catch by the naked eye.

The ball speed is 150.25 kmh and the speed is 5.84 rpm

Expected landing location: 10.28 m, 15.68 degrees south by West.

Estimated landing time: 0.85 seconds!

Perfect serve!

Cheng Nuo eyes to see this set of data, also can't help but to express satisfaction with the external spin serve.

In reality, the reason why the top professional players can not play the perfect strength of the external spin serve, nothing more than can not guarantee that tennis has a very high speed, but also can accurately control the direction of the ball.

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

So

In the real world, the first perfect external spin serve appeared in a small college team selection competition on Tsinghua campus!

Bang!

All the onlookers felt was a flash of green light before their eyes,

and then there was the heavy crash sound of the tennis ball hitting the ground.

The spinning tennis ball, after hitting the ground, did not stop spinning.

On the contrary, after friction with the ground for a few seconds, with a strong rotating force, it bounces in a certain direction.

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

And he There's no time to dodge.

Whew!

The tennis ball flew past his frame. Distance, less than one centimeter.

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

Whoo!

Wearing glasses boy breath, forehead, has exuded fine sweat.

He looked up and looked at Cheng Nuo with a strong shock in his eyes.

"Spin serve! It's a spin out serve

Among the onlookers, a sophomore boy pointed to Cheng Nuo in a terrified voice.

Cheng Nuo will tennis racket on the shoulder, left hand Chuai pocket, light smile, "small meaning."

"If I go beyond my promise, I will not win my reputation."

…………

Cheng Nuo's external spin serve out, the hospital trial seems to have no suspense.

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

In this way, Cheng Nuo and the other nine players together to form the school of economics and management tennis team. The battle for the school tennis match was held about two weeks later.

Tennis team training, is every three days training.

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

As Professor Lu has already agreed to Cheng Nuo's application for no listening, Cheng Nuo can not go to all the advanced mathematics courses.

Of course, no listening doesn't mean no training.

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 mathematics score could not be ranked in the top ten of his major, Cheng would not miss any of the advanced mathematics classes in the next semester.

As for the examination of mathematics department, in a strict sense, Cheng Nuo is still a student who rubs lessons. Cheng Nuo just wants to participate, but it seems that he can't.In this regard, Cheng Nuo expressed great regret.

…………

"Chengnuo, I have good news for you!" The night before the tennis match, Cheng Nuo suddenly sent a message on the QQ of Wangji.

Cheng Nuo quickly replied, "is the subject of progress?"

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

But Wang Ji's side, like a infertile little daughter-in-law, no news came. Let Cheng Nuo be a husband. Bah! As a student younger brother is very anxious!

Now Wang Jian says that with good news, Cheng Nuo's first thought is that the subject has made progress.

Wang Ji said, "Er ha ha We will discuss the subject later. Is that what you want to tell me about today's paper? "

Cheng Nuo: a solution to a class of linear stochastic differential equations

Wang Ji: "yes, this is the paper. Three days ago, I submitted the overhauled paper to Ying Guo's applied schema letters again. "

"Just now, I got an email from the reviewer. Do you know what the details are? "

"I don't know," she said, with no interest

“Accept！ Accept

Over there, Wang Ji looked very excited.

It was not returned to major repair or minor repair again.

This time, Wang Ji directly passed the draft!

"Ah ha ha ha!! Go straight through!! This is the treatment that big bull of academic circles can enjoy!! It's so wonderful

Cheng Nuo: "Oh."

"In this way, I will have two SCI articles under my pen. When I apply for insurance research, my chips will be much bigger."

Cheng Nuo: "Oh, congratulations."

Wang Ji: "Cheng Nuo, don't keep Oh, oh, ah, this matter, and your business!"

"Me?" Cheng Nuo doesn't understand, "what's the relationship with me?"

Wang Ji: "I'm not the only one who wrote that paper."

Cheng Nuo seems to have guessed something in his heart.

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

In the document, are the papers that have been confirmed by SCI journals after Wang Jian's overhaul.

Open the paper. In the column of the author, there are two names:

Wang Jian, Cheng Nuo!

Joint signature!

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