Clow Cards Cardcaptor - Chapitre 1292
“Using this point, you can build an elevator on the equator that is higher than the synchronous orbit, and the two forces are balanced at the synchronous orbit.”
Hearing Li Ze continued to explain, Fang Ran saw him raise his hand and draw a picture, extending the inner circle. A slender rectangle that exceeds the outer circle is drawn, and the point where it intersects the outer circle is marked as r0, which
subtly recalls the feeling of being dominated by physics.
“In the part under the synchronous orbit, the radius becomes smaller, the gravity formula GMm/r2 is relatively large, and the centrifugal force formula mω2r for the part beyond the synchronous orbit is relatively large.”
No, wait, I always feel two A very familiar formula appeared…
Looking at Li Ze marking the slender rectangles on both sides of the outer ring in red and blue, indicating that they were’pulled’ in two completely opposite directions by gravity and centrifugal force,
I was sweating. For a moment, Fang Ran saw the opening he finally looked at himself:
“Then, as long as the forces on these two parts are equal, the space elevator does not need support to stand in space.”
After listening to these, Fang Ran I felt astonished by the sudden realization.
“The concept of the space elevator was actually put forward very early, and the technical principles have been relatively perfect.”
Li Ze put away the projection, and the narrow top of the mountain restored the warm light of the bonfire again, while Klim looked at it with a smile. Supplement:
“About a hundred years ago, Tsiolkovsky put forward this idea. The current jet rockets and graded rockets are all his ideas.” A
hundred years ago! ?
For the era before this time, he felt more profoundly than the two of them. Fang Ran couldn’t believe that when he drove the carriage through the wheat fields,
someone had already proposed a space elevator. It still makes him feel incredible today. Vision.
“Then such a good thing, why not build it?”
Thinking of the series of advantages and meanings they had just said, understanding the principles seemed quite feasible, and then asked strangely,
knowing that he would definitely ask, Kerim and Rize looked at each other. It seems to be communicating who will explain.
“Because of the tensile strength of the material.” In the
end, Klimt answered with a voice. He recalled the relevant details he knew as much as possible, and said softly and helplessly:
“At the same time, the balance of gravity and centrifugal force will produce a very huge stretch Stretching force, in order to meet the requirements of the space elevator, I remember that the specific tensile force per unit area needs to be greater than the material density multiplied by…”
“Okay, you can give an example directly.”
He always felt that he was reminiscing and saying that he didn’t Knowing the origin of the number, facing four people who are more knowledgeable than himself all day in the middle of the night, he
spoke directly and silently without any fluctuations.
“Haha, if you take the density of steel as an example, it would take about 4 million times the atmospheric pressure, that is, a steel cable with a thick thumb to hang 4,000 tons of heavy objects.”
“But the actual steel cable can only be one-thousandth. It’s too dense.”
Hearing Fang Ran’s words, Klim couldn’t help but smile and give a direct example.
“That is to say, is it stuck on the materials…”
For this answer, thinking of the problems I faced not long ago, it was always a difficult problem to develop new materials.
“It’s not completely stuck on the material. In fact, a material that can satisfy the space elevator has been discovered now.”
Has a new material been discovered?
Surprised that he was not stuck on the material, Fang Ran looked at Klim unexpectedly and saw him smile and say a name.
“Carbon nanotubes have excellent tensile strength, and the density is only one-sixth that of steel. They can be produced with the current technology in reality.”
“No, wait a minute, since I have discovered the material, I have never heard of it. You must say that this material is either expensive or ridiculous, or it is hard to make….” It
was not too early to be happy, keen. Perceiving a strange place and digging out the relevant memories from the remaining high school knowledge,
Fang Ran looked suspiciously at Klim and asked silently:
“I remember the synchronous orbit seems to be more than 36,000 kilometers, plus the paragraph above. How much can that kind of carbon nanotubes produce?”
“Half a meter.”
Fang Ran : "..."
Hey, good
fellow, it ‘s still a matter of rice… It’s just a silent choke, staring at Klim I couldn’t say anything.
À mi-chemin
through, he just burst into laughter. He clutched his stomach and looked up at the Milky Way above his head . For some reason, he couldn’t help but laugh out loudly:
“Half a meter…poof, I drop. God, half a meter is too ridiculous, hahahaha!!”
“I remember this was made by one of your Huaxia labs.”
Seeing him like this, Klim couldn’t help but smile, and Li Ze also Slightly laughed.
“At least in terms of tons, it can give me some hope…” I
don’t know why I smiled so happily. Fang Ran wiped the corner of his eyes and looked at Li Ze and Klim. It turns out that this is them. The two mouths are’relatively realistic’.
Half a meter is more than 36,000 kilometers. This difference is not a star and a half at all.
But thinking about the deep-space navigation mentioned before, and the speed of light engine that is not even theoretical, this has been completed. Half a meter is indeed more realistic.
When I think of the first step to enter the universe, the space exploration at close range is still half a meter to tens of thousands of kilometers. At
this moment, looking up at the Milky Way,
Only then did I really understand the distance of the starry sky overhead,
even the solar system cannot travel, the Milky Way with hundreds of billions of stars, and the local galaxy group it belongs to, and even the upper-level Virgo and Rania Kea superclusters. How far away it is…
But thinking about a hundred years ago, when there were no rockets, someone had already proposed the idea of a space elevator,
and suddenly I felt that this remoteness does not seem to be eternally inaccessible.
“Speaking of reality, you can make a length of half a meter. If you switch to the technology level of night battle, will you be able to create a space elevator!?” As
if suddenly thinking of the part that is beyond reality, he raised this point, his eyes brightened Asked.
“It’s not that simple. Compared with reality, the level of night warfare is indeed higher in science and technology, but most of the disorganized systems are biased towards weapon and mechanical development, and there may not necessarily be related technologies.”
As an elite technologist, Li Ze shook his head in reply and looked overhead The Milky Way starry sky, whisper the most important reason.
“And no one knows if night warfare technology has flowed into reality, whether it will be a space elevator.”
“That’s it, eh! By the way, is there anything similar to a space elevator…”
With the sudden voice of the youth that seemed to understand , He curiously asked again.
In the midnight with rich fantasy colors, discussing the topic of science and technology and the starry sky. On
the narrow top of a high-altitude island-like narrow mountain, three young people were sitting on a tree stump around a bonfire. Their warm words lasted for a long time in the night, and the
figure was jumped to the two birds next to the camera and pecked at the shutter to record…