Alone and Infinite.

Chapter 649 The Terrifying Slingshot!

As soon as Li Xia entered Madao's courtyard, the old man glanced at him and said in surprise:
"Which equipment is this accessory from? Judging by the negative effects, the equipment must be pretty powerful."

Look!
That's what you call professional!
Those weakling apostles only think of dirty things like service robots, companion robots, and Fiji cups when they see ghosts, but professionals like Mada can see the details!

Otherwise, how could they have made a name for themselves in the workforce?

Li Xia raised an eyebrow, about to speak, when she saw Ma Daou put down his tools, brush the dust off his clothes, and walk over with a look of curiosity on his face.

"What kind of equipment carries such a vengeful spirit, a human doll?"

Li Xia:
"What kind of look is that?!"

Ma Da'ou gestured for Li Xia to sit at the stone table, poured two cups of tea, and said with dissatisfaction:

"I have actually seen people turn living people into dolls using special techniques, and some have even cut off their limbs and heads, leaving only the body."

The psychology and aesthetics of perverts are beyond your comprehension; sometimes, those special 'dolls' are also haunted by vengeful spirits.

There was an apostle who liked to use this and got entangled with it, eventually having to pay someone to remove it. It's considered an equipment debuff, and the Temple doesn't care about it.

There really is one?

Li Xia silently showed the properties of the red rope in her hand to Madao.

With just one glance, Madao looked up at Li Xia in shock, gasping for breath:
"Hiss—! They actually dare to use this kind of equipment???"
Getting an extra item from a treasure chest is great, but this is an authoritative level event where luck is reduced to 0!!
It goes without saying how important luck is to an apostle, right?
Although you won't die, this is no different from slow suicide!
Listen to me, hand over this equipment right now.

He went on and on, genuinely concerned. He'd finally found a reliable ally, and what if things went wrong like this?

Li Xia remained silent for a moment, his face displaying a calm and collected demeanor befitting someone who had weathered many storms:
"I'm used to it."

Although it's only four words, Madao could taste relief, letting go, and bitterness in these seemingly ordinary words.
A mix of emotions!

"Alright, as long as you're confident."

Madao sighed and glanced again at the female ghost clinging to Li Xia like a koala. She was indeed beautiful and stunningly pretty; even many top-tier plastic surgeons couldn't replicate her aura.

He couldn't help himself and pointed at the female ghost who was hugging Li Xia's arm and smiling so hard her eyes were narrowed:
"Aren't you feeling uncomfortable?"

Li Xia tilted his head and glanced at it, then said expressionlessly:
"In reality, she didn't even come into contact with me. Because of the laws of the temple, I couldn't kill her even in the temple of light. And under normal circumstances, other people can't see her. It's just that the temple is special, which is why she shows her physical form."

Oh, right, she did it because—"

Li Xia paused for a moment, organizing her thoughts. The female ghost needed to absorb luck points to borrow the wearer's fate and transform into a physical form. Right now, she couldn't absorb any luck points at all, and absorbing too many would only bring misfortune.

"Well, for some reason, she can only exist as a phantom, without a physical form."

"Your relationship is quite peculiar."

Mada smacked his lips and poured himself another cup of hot tea. Li Xia also picked up the teacup and sniffed it, only to find that it wasn't Bai Xiao's tea.

"Take a look at this thing and help me test it out. Find out where its limits are."

The old man took the bundle of pale gold, multi-stranded rope, twisted it with great interest, pulled on it for a while, sniffed it, and finally simply bit into it.

"Sure, it's a good material. This stuff has excellent toughness; it's some kind of biological material, and the kind that can change shape."

So what gives it these extraordinary properties? What is it from?

"dragon."

Madao froze, staring in horror at the rope in his hand, then tremblingly turned to look at Li Xia:

"You went to slay dragons again???"

He knew what kind of dragon Li Xia was talking about. If it were a large lizard with two wings, Li Xia would say it was a Western dragon. But with just the word "dragon," there could only be one answer: a legendary creature in the modern world, the totem of China, the dragon!

"You got it from Im in the One Piece world, didn't you check the stats?"

"What do you know! Anyone who looks at the panel right away is a low-level blacksmith!!"

Madao's face turned bright red, and he mumbled incomprehensible things like the pride of a craftsman, recognizing materials with the naked eye, and saying that looking at the panel is like being fed.

A smile appeared on Li Xia's face, and the whole courtyard seemed to be filled with a pleasant atmosphere.

Are there dragons in the world of One Piece?

Madaro never read comics before, but after entering the Hall of Fame, even the most enthusiastic apostles have to catch up on a large scale. This includes not only anime, but also movies, games, and the like.

Before Li Xia could answer, he muttered to himself:
"Yes, there should be. After all, the image of the dragon is too specific and highly consistent, and there is no evolutionary process. In other words, there should have been a specific image of the dragon in the past, and many people have seen it."

It simply disappeared suddenly, leaving behind only legends.

The old man stood up, took the rope, and walked towards the workshop:

"Okay, this is easy, I'll test it out."

Li Xia continued to calmly drink his tea, and casually glanced at the chat on the communication platform. It was through the platform used by the reserve officers that Li Xia discovered something very important.

That is to say, how precious divine power is in the mid-level or early-stage high-level realms.

Normal apostles typically only acquire a certain degree of divinity starting from the eighth rank, which means they leap from the material world to the 'rules'. They only possess a certain degree of divinity and find it difficult to gather believers and condense divine power.

Top-tier apostles begin to gather their followers at the eighth rank, at which point they begin to generate divine power.

Only apostles at the reserve or acting level begin to gather divine power and collect their followers at the sixth or seventh rank.

Li Xia is even more impressive; he started at the fourth rank!

Currently, he has accumulated several dozen points of divine power in each world, which means that he can passively obtain one essence of divine power in each world.

If we also include the world where the little knight is, we might be able to increase it to two!

The difference is quite exaggerated. Many apostles keep the essence of divine power to themselves and are reluctant to use it at all.

Therefore, for Li Xia, investing his divine power in production to acquire more divine power is the best option.

"Tsk tsk, it came back positive!"

Madaro held the rope in his hand, clicking his tongue in admiration as he turned it over and over to admire it.

“Sometimes biological materials possess unique properties that artificial composite materials lack, and this rope is quite perfect!” He placed the rope on the table and picked up his teacup:
What are your thoughts?

"Hmm, how about a slingshot?"

Li Xia tapped her fingers on the table and tentatively asked.

"slingshot?"

After thinking for a moment, Madao slowly nodded, his eyes gradually brightening:

"Good! Quite good. As for your arm strength, just use your normal strength without any explosive movements."

Li Xia thought about it carefully for a moment, then slowly said:
“Under the fourth-order standard gravity environment, the strength of a single arm should be around 10 tons, and it would be much higher with the use of skills and techniques.”

"10 tons? Wow, that's some kind of strength..."

Madao clicked his tongue. Ten tons with a single arm was already quite terrifying at the fourth level, especially since the gravity in many worlds was not as high as the standard gravity.

For example, the world of One Piece has an even more exaggerated level of expressiveness.

"If it's 10 tons, that's more than enough!"

Madaro took out a writing tablet and quickly wrote out various numbers, saying in the process:
"There are two types of slingshots, you know that, right?"

"Yes, the common Y-type and the bow-type slingshot used in ancient warfare."

Li Xia was naturally aware of this as well. The power of the bow-type slingshot was actually quite strong. According to records, the ancient bow-type slingshot could be launched 150 paces, and its power could even penetrate cowhide armor.

"The power of a Y-type slingshot depends on the rubber band, also known as the elastic coefficient, while the power of a bow slingshot depends on the force of the bow arm's rebound."

However, I have a suggestion here. Because your material is extremely special, simply put, it has biological properties. Ordinary elastic materials, when stretched to their limit or beyond, may cause the internal coiled molecular structure to break, thus losing their elasticity.

But I just tested this dragon tendon rope, and even when stretched to its limit, its internal structure remains stable, and any breaks will repair themselves.

Do you know what this means?

After saying a lot, Madao looked intently at Li Xia:

"In other words, we can even combine the advantages of the bow slingshot and the Y-shaped slingshot!"

It utilizes both the power of the slingshot's bow arm and the elasticity of the rubber band itself!

Li Xia raised her teacup and slowly took a sip:
"I want to know how powerful this slingshot is, and whether it can meet my needs."

"You have no idea of ​​the power of this treasure!"

As a top expert in materials and metallurgy, Madaro decided to uphold his dignity and teach him a lesson:
"There is a rubber band with an original length of l along the stretching direction. The coordinate of the support end is x = 0. The width of the rubber band is n(x). The stretch per unit width of the rubber band is a function of stress Δx(f). The load mass is M, the mass of the rubber band is m, and the velocity at the load end is V0!"

If a rubber band is stretched by a force F, we can construct the energy conservation equation.

Initially, I tried to analyze the forces acting on each point on the rubber band and construct a wave equation. However, if I studied it this way, the mathematical form would become extremely complex, no less complex than the Navier-Stokes equations!
But then I suddenly thought of a brilliant idea!

That is, I discovered that although each particle transmits energy in a very complex longitudinal wave during the rebound process of the rubber band, the rubber band rebounds to its original length at almost the same time at all points!
All the rubber bands reset simultaneously, so t is the same!

As for why the longitudinal wave needs to maintain this velocity ratio, it's because if this velocity ratio isn't maintained, the elastic band's rebound process won't satisfy the "principle of least action." If you don't understand, you can study the "Euler-Lagrange equations."

Li Xia's face already showed a blank expression, as if her mind was filled with knowledge.

But Madaro has clearly found his rhythm in teaching at university. In his view, no matter how slow a person is, they should be able to master calculus by their teens, right?
He excitedly wrote on the whiteboard:

"The total potential energy Ep is equal to the integral of the tensile force F at each position:"
This is actually the formula for the integral transformation of an inverse function in advanced mathematics. It's quite simple: geometrically speaking, the integral of the inverse function equals the area of ​​the entire rectangle minus the integral of the original function!
Therefore, this physical process is actually a process of energy redistribution!

Simply put, it's the elastic potential energy of the rubber band at the head end that's transferred to the pocket end!
By constructing equations for the conservation of kinetic and potential energy, I cleverly avoided the extremely complex problem of longitudinal wave vibration of a particle and directly studied energy.

Li Xia listened to Ma Da's rambling in a daze. Although he had been studying recently, he was just starting out and couldn't understand these thoughts that sounded like 'demonic chants' at all.

Instead, they didn't notice that the ghost perched on their head had moved closer, resting its chin on its hands, swinging its legs, and listening intently to Mada's explanation.

With spittle flying, Mada waved his pen and wrote line after line of equations on the whiteboard.

"The entire set of equations applies to rubber bands of any shape, then to bullets of any mass, and to any amount of stretching! It is the general equation for the conservation of elasticity in rubber bands!"
When the rubber band is trapezoidal in shape, and when the rubber band is fully stretched, this complex integral equation will be greatly simplified, and a very meaningful particular solution can be obtained!

If we consider the rubber band as countless infinitesimal areas, each of these areas carries the same amount of elastic potential energy. We can directly use k to represent the elastic potential energy density.

Madaro thought for a while:

"We can solve this equation, and the result is..."

A pleasant female voice suddenly came from above Li Xia's head:

"The square of V equals m divided by k, then divided by **[(b/4 plus a/12) multiplied by m, then divided by the sum of (a plus b), plus half multiplied by M]**!

"

Madaro: ???
Li Xia: ???
Sister, you can understand all of this? And you even answer questions before me?? Are you the most intelligent person in the world?

"Ugh"

Ma Da'ou, feeling utterly disheartened, threw down his pen, looked at the ghost who was grinning with narrowed eyes and swinging her long legs, and glared at the 'academic failure' Li Xia with a look of utter disappointment:
You're not even as good as a ghost!

Li Xia:
"Fine, just tell me directly: how powerful will this thing be if it's made, and will it be enough for me?"

"power?"

Madaro crossed his arms, exuding an air of invincible loneliness:
"Once this thing is made, please call it by its full name: Bullet - Super Kinetic Energy Destroys Heaven and Earth, Crushing Electromagnetic Cannons - Bow!"

Li Xia was taken aback. It sounded incredibly strong!

A slingshot, is it real or fake?

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1. Monthly pass 2. Recommendation vote

This chapter took me a very long time to complete. This is something I should probably just gloss over, but it's driving me crazy.

I just think slingshots are very powerful, but I at least want to tell everyone why they are powerful and where their strength lies. I'm not just making things up; according to calculations, they are indeed that powerful.

The above content is from Zhihu and AI co-produced.
(End of this chapter)