Learning Demon Cultivation System

After a while, the bald man hesitated and said, "Then tell me, why did you choose the launch site here?"

"Get maximum inertial speed and save fuel."

"What?" The bald man's eyes widened when he heard that, "Don't talk nonsense and teach the children nonsense."

"Hmm..." Lin Yujing waved her hand at Li Zheng, "Dr. Li Yi, tell me."

"..." Li Zheng fell into a panic in an instant.

It's over, dragged to the children's team.

But the matter has come to this point, he can only force it.

Li Zheng cleared his throat and said very politely: "This...uncle, your explanation to the child just now is indeed not comprehensive, and some of it is misleading. The launch site is set here, and the primary basis is based on physical considerations .”

Seeing that Li Zheng spoke with a nose and eyes, the bald man stopped talking for now, and the two children were full of anticipation and listened attentively.

Li Zheng scanned around and soon found a leather ball next to the boy's stool, so he picked it up and borrowed it.

"I try to speak to the level that elementary school students can understand." Li Zheng picked up the ball and twirled it in his palm, "The earth will rotate like this, you know it?"

The little boy and the little girl nodded immediately.

"Okay." Li Zheng said as he picked up his chopsticks, dipped in the beer, and randomly ordered a small dot in the "northern hemisphere" of the ball. "Then let's assume that Yuanyuan is here, which is probably the location of Jijing."

Then, he clicked a point on the equator of the ball: "This is where Wen Hai is, and Pudding is here."

"Then, you are all smart kids, you know that the earth rotates all the time." Li Zheng then turned the ball again, dipped his chopsticks in beer, and drew the trajectories of two points rotating one circle respectively. Above are two latitudes, a pair of concentric circles.

"Now, the earth has rotated once." Li Zheng showed the ball to the two children, "Can you tell me, in such a long time, is Yuanyuan turning more distance, or more pudding?"

"Pudin!" Yuanyuan raised her hand and said, "The circle of pudding is bigger."

"Very good." Li Zheng nodded and smiled, "So we can know that Pudding has turned more distance than Yuanyuan in the same period of time, so who turns faster?"

"Me!" Pudding raised his hand excitedly.

"So, even if you stand still, Pudding's natural initial speed is already much faster than Yuanyuan." Li Zheng pointed at the small dot on the equator with his hand and said, "When you launch a rocket from Pudding, there will be speed as soon as it comes up." With a great speed, we can use less fuel to send the rocket into space, don’t you think it’s wonderful?”

"Wonderful!" The two children applauded and exclaimed.

"Hahaha!" Li Zheng looked at the two excited children, and he was naturally happy, "So, this is the advantage of Wenhai launching satellites. It can be said that Nanhai Province is basically the most advantageous place for launching rockets in our country. Yes. The most important reason we chose this place is to use less fuel and transport heavier satellites into space. Now, you two know this, and you have become little experts in physics. You can talk to your classmates when you go back .”

The little girl looked at Li Zheng with blinking eyes and asked, "Brother, are you a physicist?"

"It's still early... I've learned a lot..."

"Do you understand, grandpa?" the little boy said to the bald man, "it was chosen to launch here because of the laws of physics."

"Go, go, I already understood..." The bald man scratched his head and asked, "Isn't that just going south and getting faster, why don't you let Sanya go to the launch site, and what do you let Wenhai do?"

Li Zheng replied immediately.

"The direction of the earth's rotation is from west to east. This time the launch is a synchronous satellite, which remains stationary with the earth's rotation. Therefore, it will also be launched to the east. The east of Wenhai is the sea area controlled by our country. It is neither inhabited nor easy to recover."

"As for Sanya, in the event of an accident, there is a very low probability that the rocket will land in the residential area in the southern part of Nanhai Province."

The bald man took a sip of his wine, but couldn't ask any more questions.

It was the glasses man who became interested: "Then let me ask one more question, how much will it affect the speed and fuel if we choose Jijing and Nanhai?"

"This... Let me calculate it later." Li Zheng raised his head, squinted his eyes, and said after half a second, "I'm just making an approximation. The linear speed of Jijing is about 370 meters per second, and Wenhai is about 460 meters, the fuel saved is about 12%, and it is precisely because of this 12% that the Yellow River-[-] can become the launch vehicle with the largest capacity in my country."

"Ah." The glasses man exclaimed, "I completely understand now, thank you, young man."

Although the bald man on the opposite side was a little reluctant, Li Zheng's spout of truths was indeed understandable to him, and he couldn't refute it.

"Then...young man..." The bald man scratched his face and asked, "That is to say, the rocket was launched towards the sea, and even if there was a problem, it would fall into the sea. Our community must be fine, right?"

"Sure, sure, it's okay." Li Zheng smiled, "The Wenhai launch site has been carefully selected, and the design and construction team is also the most sophisticated in our country. You may not care, but for children, a lifetime can be achieved." It’s actually not easy to catch up with a big development in spaceflight. Letting children take a look at it can be regarded as a physical enlightenment. I just don’t have children, otherwise I would have to hug me to take a look at every full moon.”

"Okay." The bald man laughed, picked up two beer bottles and walked to Li Zheng, handed Li Zheng a bottle and raised his hand, "Let's not go, let's watch the rocket launch!"

The two children immediately jumped up.

The glasses uncle also came over to have a drink.

When Li Zheng returned to his seat, he was already a little drunk.

However, he found that Lin Yujing was covering her face with a smirk, and her face was even more drunk than her own.

Li Zheng squeezed a mouthful of vegetables and said with a smile: "Why, you know you're panicking now?"

"What are you panicking about?" Lin Yujing said softly, "You are really patient when teaching children..."

"Hey, idle is also idle."

"Don't you hate children and don't want children?"

"Yes, it will affect learning."

"Cuckoo..."

"why are you laughing?"

"It's okay." Lin Yujing quickly picked up the cup, "I'll take a sip too~~"

Chapter 278

After eating and drinking enough, Li Zheng and Lin Yujing had no intention of going home, so they simply strolled to the beach, walking under the starlight and chatting with the sea breeze.

Even here, you can still see the brightly lit launch tower five kilometers away.

Lin Yujing, who was addicted to alcohol, couldn't help herself. Standing on the beach, she gestured and pointed. After all, no one knew rockets better than her.

To the uninitiated, the launch of the Yellow River No. [-] is not much different from every previous rocket launch.

But for Lin Yujing, who has been in the Aerospace Research Institute since her mother's womb, this moment is full of historical significance.

Once successfully launched, Huanghe-[-] will become the top five heavy-duty launch vehicles in the history of carrying capacity and the top three in active service, and it will also become an important milestone in the history of China's aerospace development.

Accompanied by Lin Yujing's guidance, behind this launch, a history of human spaceflight development slowly unfolded in front of Li Zheng.

There is only one theme in this history——

Send heavier things to the sky.

To evaluate the carrying capacity of a rocket, there are usually two data.

One is Low Earth Orbit (LEO) capacity.

The second is geosynchronous orbit (GTO) capacity.

The orbital altitude required by the former is mostly within 2000 kilometers, while the latter needs to send satellites to a deep space of 3.6 kilometers, so the capacity of GTO is mostly within half of that of LEO.

Taking GTO as a reference, the highest record in history has been maintained by the Saturn V of Magnesia for half a century.

48.6 tons, this is the historical limit of the launch vehicle.

It is also the heaviest rocket in history, with a take-off weight of 3038.5 tons.

This rocket carrying the limits of human beings is truly going against the sky.

It is carrying thousands of tons of chemical fuel, with a brutal force, just to send a satellite that is 1.6% of its own weight into deep space.

The former Soviet company then seized the time to launch the equally famous N1 launch vehicle, but the four test launches all ended in failure.

But even if its launch is successful, the capacity of GTO is only 23.5 tons.

Then, as the Cold War cooled, the space race among the superpowers came to an end.

Those who defy the sky have since lost the meaning of defying the sky.

After completing its mission for the last time in 1973, the Saturn V was announced to be decommissioned.

The next big guy of the former Soviet Union, the "Energy", was successfully launched in 1987, reaching a GTO carrying capacity of 22 tons.

These records have yet to be broken.

Today, although the 14 tons of the Yellow River No. [-] cannot exceed this record, it has the qualifications to challenge.

This launch will triple the capacity limit of the Chinese carrier rocket across the ages.

There will always be those who go against the sky and go against the sky.

"This is my mother's mission." Lin Yujing stared at the brightly lit launch tower on the other side of the bay mouth, gently lifted the air in her hand, "Send heavier things to the sky.

Li Zheng recalled this period of history, imagining the moment when the rocket lifted off.

At this moment, he just wanted to say.

Your mother is awesome.

But held back.

In order not to fall too far behind Lin Yujing's family, he had no choice but to forcefully set up Lao Li's personality.

"My father, why don't we have his task." Li Zheng stood on the rock with his hands behind his back, "That is to cut off more tumors, and of course, damage the patient's nerves as little as possible."

"..."

"Ah, they are all great people." After Li Zheng sighed, he suddenly remembered something, "But I remember you said that instead of betting your life on such a task, it is better to look at the stars, so you I just chose the astronomy department."

"Hmm..." Lin Yujing's head gradually drooped, "Even if my mother can work until she is 70 years old...even if she can triple her luck again, then triple again, so what... don't talk about her, even if she is I, the biggest limit I dare to imagine in this life, can only be a manned landing on Mars..."

Li Zheng turned his head and asked with some hesitation: "But when you look at Yellow River No. [-], you still cry..."

"Yes...but I also know...you can't fly very far in your life..." Lin Yujing clenched her fists and looked down at the waves under her feet, "You probably have to say something critical again... "

"No, no, no... I understand now that no one is qualified to give advice on other people's lives." Li Zheng sighed and jumped off the rock, "You are just too smart, like solving a problem. You will come up with extreme results directly, and when you look at spaceflight from your perspective, you can always see through the struggle and despair at a glance...but you also like it very much..."

As Li Zheng said, he put a hand on Lin Yujing's shoulder.

"During the heart-to-heart meeting on the basketball court, you said that your troubles were 'time and space scales'."

"Now, I probably really understand."

Lin Yujing trembled, and raised her hand to push him away, but her hand slowed down in mid-air.

However, Li Zheng had no plans to spare, he had already withdrawn his hands, and returned to the posture of standing with his hands behind his back.

"Scumbag..." Lin Yujing cursed secretly, and asked back, "I remember you said that your trouble was too little time and too much knowledge."

"Really, I forgot." Li Zheng laughed with his hands behind his back, "You really are young and crazy to say such things."

"Hmm..." Lin Yujing kicked the sand and said, "I'm beginning to understand what Zha Xuan said."

"Hehe." Li Zheng smiled lightly, "I don't believe it."

Lin Yujing didn't care about him, she just stood there, watching the waves roll by, letting her shoes sink deeper and deeper in the sand.

"If there are many paths."

"If I say it, I will see the end at a glance."

"Then choose the most satisfying path."

"In your case, as long as you choose a path, you will walk down it."

"You can't see the end at all, and you don't care about the end."

"Wherever you can go, there is the end."

This last sentence instantly gave Li Zheng goosebumps.

Damn it... Is it the difference between a composition score of 55 and a full score...

"I...I believe it..." Li Zheng trembled, "There are people who understand rockets better than you, but no one understands me better than you."

Under the moonlight, Li Zheng couldn't see Lin Yujing's face clearly, he only knew that she turned her head and slipped back: "Who wants to understand you, let's get started!"

"Haha." Li Zheng smiled, and chased after him, "I don't, I'll post it."

"It's disgusting, I only post with Xiao Ke and Meng Xi."

"But Xiao Ke also sticks with me."

"Scum dog, I won't post her in the future."

……

After returning home and saying good night, Li Zheng helped Lin Yujing close the bedroom door.

Then each took a shower, each went to bed, and each slept.