this post was submitted on 28 Jan 2024
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Lemmy Shitpost

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[–] [email protected] 42 points 9 months ago* (last edited 9 months ago) (4 children)

A lot of people think that to get to orbit, you just have to go up, but actually you need to go sideways.

Imagine throwing a ball that leaves a visual trail behind it. You throw it straight up, it comes straight back down and just leaves a vertical line. Throw it across the room, and it makes an arc. Take it outside, throw it really hard, and it makes a bigger arc. Zoom the camera out, and throw it so hard it goes over the horizon. It leaves a pretty long arc right? If you throw it hard enough, that arc goes farther and farther past the horizon until it misses the ground entirely and comes right back around to you. That's an orbit!

But that's only part of it. You see, any time you impart force on an object in orbit, you only change its trajectory, not its current position. Since your arm is now the lowest part in the ball's orbit, you can never raise that point above where your arm is. But you can affect the other side of its orbit–the faster you throw the ball, the higher the opposite side of the orbit gets. Let's head up to the highest point in the ball's orbit, and give it another push. Again, that doesn't affect its current position, but it does affect its trajectory. Making the ball go faster forward increases height at the opposite side of its orbit, so if we push it with the right amount of force, we can make its orbit circular!

Now you know enough to get a rocket to space! Well, kind of. You also need to know about fuel and the tyranny of the rocket equation, but that can wait until you play Kerbal Space Program or get a job at NASA

[–] [email protected] 12 points 9 months ago

Hey! Your user name matches the things you said!

[–] [email protected] 9 points 9 months ago* (last edited 9 months ago) (1 children)

Let's imagine we're in a rocket ship in a circular orbit, and we want to go back to earth. You might think you need to point towards the ground and turn your engine on, but remember how we got up here–we're in orbit because we're going sideways very fast. The most efficient way to come down is to point backward along our orbit and slow ourselves down, to lower the height at the opposite side.

What happens if we do point straight downward? Well, we would start going downward, but because we aren't pointing straight backward, we aren't actually reducing our speed, only changing the direction of the orbit. It would take much more energy to come back to earth this way, and because we aren't actually reducing our speed, it would be much more dangerous, because we would be entering the atmosphere faster than if we had pointed backwards instead.

In a worst case scenario, we would run out of fuel before re-entering the atmosphere. This is very bad, because as we fall towards the earth, we start moving faster. Remember how moving faster at the lowest point in an orbit increases the height of the highest point? If we don't hit the atmosphere, the top of our orbit will end up even higher than it was before!

[–] [email protected] 3 points 9 months ago (1 children)

worst case, you miss the earth and go lost on a massive elliptical orbit for some time.

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[–] [email protected] 5 points 9 months ago

yeh thats like the first thing you intuitively learn when playing KSP.

[–] [email protected] 4 points 9 months ago

The Guide says there is an art to flying", said Ford, "or rather a knack. The knack lies in learning how to throw yourself at the ground and miss."

  • Douglas Adams
[–] [email protected] 40 points 9 months ago (1 children)

I knew something once. It was awful.

[–] [email protected] 5 points 9 months ago

That's an ace comment! Thank you for the smile provoking words.

[–] [email protected] 24 points 9 months ago (1 children)

I've watched a lot of Star Trek so I know a lot about gay space socialism

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[–] [email protected] 22 points 9 months ago (2 children)

Did you know that having a constantly open mouth as a child is really detrimental to the development and growth of your mouth's palate, your overall posture, your nose, and many other parts of your facial and bodily structure?

Physiologically speaking, your mouth should be closed most of the time. If it is, the crown/tip of your tongue should rest right on top if your alveoles, ie. just before your upper front teeth. This leads to your palate being formed and molded as a child into what you should know today. If for some reason you only rarely have your mouth closed as a child, this can lead to a deformed palate, making it more difficult to speak in the future, breathe etc. Furthermore, you are more likely to get sick since you're not breathing through your nose where all of the bacteria you passively inhale through the air are filtered out by your tonsils. Additionally, your nose may be malformed by its irregular use as well since the air your breathe in and out helps form your nose too.

Potential reasons for not breathing through your nose might be problems with your jaws (overbite/underbite) or teeth, inflamed tonsils that hinder your ability to breathe through your nose, a too short tongue frenulum that hinders the ability to properly reach your palate, and more.

Happy breathing. :D

[–] [email protected] 3 points 9 months ago* (last edited 9 months ago) (1 children)

im such a nose breather that i dont really get clogged nose anymore even when im sick

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[–] [email protected] 22 points 9 months ago (2 children)

The Ooh Ooh song is Temptation by New Order

The Woo Ooh-ee song is Elevation by U2

The Woo-ooh, Eeh-Ooh-Ooh song is Woo Hoo by The 5.6.7.8s

The Ooh-Aah Ooh-Hoo Ooh-Hoo song is Who are You by The Who

The Woo Hoo song is Song 2 by Blur

The Woop Woop song is Sound of Da Police by KRS-One

Hope this helps.

[–] [email protected] 6 points 9 months ago* (last edited 9 months ago) (1 children)

What about the Ooh-ah-ah-ah-ah song and the Ooh-we-ooh song?

[–] [email protected] 7 points 9 months ago* (last edited 9 months ago) (2 children)

The first one sounds like Down With The Sickness by Disturbed

I think the second one is the theme from Doctor Who

[–] [email protected] 3 points 9 months ago* (last edited 9 months ago)

To be fair the original knowledge was flawed.

Temptation is more of a Ooh-e-Ooh Ooh-e-Ooh Ooh-oo-oo-ee-ooh Ooh-oo-oo-ee-ooh, so I can see the confusion.

However, unless they've changed it in the last few years, I would have said Doctor Who is more

Wee-Ooooh Whoo-Ooh-Oo-Oo (Daddle-a-da daddle-a-da daddle-a-da daddle-a-daddle) Whoo-oo-oo wh-oo wh-oo-oo. (Daddle-a-da daddle-a-da daddle-a-da daddle-a-daddle)

[Edit] Apologies, I've just realised you were replying to a reply of a reply, I didn't follow the little lines properly and got confused.

[–] [email protected] 3 points 9 months ago (1 children)

I thought the second was Buddy Holly by Weezer.

[–] [email protected] 3 points 9 months ago

That's it! Thank you!

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[–] [email protected] 16 points 9 months ago

Well don't ask jon snow

[–] [email protected] 16 points 9 months ago (1 children)

Inertia is a property of matter

[–] [email protected] 13 points 9 months ago

Also, the mitochondria is the powerhouse of the cell

[–] [email protected] 15 points 9 months ago (1 children)

If you build a linked list in C, and put the pointer to the next entry as the first element in your struct, then you only need a single variable (and two comparisons) to do sorted insertion into the list.

[–] [email protected] 4 points 9 months ago

That's too complicated for me to understand so here is my thing I know:

When using example code from the Internet, it's important to read the comments at the top of the file before going to far into adapting it and then wondering why it isn't working.

[–] [email protected] 14 points 9 months ago (8 children)

i can whistle continuously without the need for breathing stops

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[–] [email protected] 13 points 9 months ago

Mitochondria is the power house of the cell

[–] [email protected] 12 points 9 months ago

I used to know, but now I'm not so sure anymore.

[–] [email protected] 11 points 9 months ago (2 children)

I know a fun fact:
You know how a packet of 8 bits is called a byte? A packet of 4 bits, which is half a byte, is called a nibble!

[–] [email protected] 5 points 9 months ago (1 children)

Ackshully, it's spelled nybble...

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[–] [email protected] 10 points 9 months ago

Not yet, but I'll keep you updated.

[–] [email protected] 9 points 9 months ago

I have approximate knowledge of many things

[–] [email protected] 8 points 9 months ago

Be careful. Before you know it they’re making you drink hemlock for corrupting the youth and idolizing false gods.

[–] [email protected] 7 points 9 months ago (1 children)

According to Descartes I think therefore I am (and that's all I know), but to be honest I'm not convinced...

[–] [email protected] 3 points 9 months ago (1 children)

I also know that he was a drunken fart.

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[–] [email protected] 7 points 9 months ago

I think I've... no, I've never done any of that before, sorry.

[–] [email protected] 7 points 9 months ago

This could be the requirements for a job

  • 5 years of experience with something (E)
  • 2 years of experience with anything (D)
[–] [email protected] 7 points 9 months ago

the sun is the biggest star in our observable solar system

[–] [email protected] 7 points 9 months ago (1 children)

Just fine dining and breathing, I'm afraid

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[–] [email protected] 7 points 9 months ago

If you're ever looking for cheap jewelry/earrings, you should be very very careful.

CTV Marketplace did an investigation a few years ago, and they found that a lot of children's jewelry contained high levels of lead and/or cadmium. These pieces were found in multiple places, including Claires and H&M. Some children's makeup was also contaminated.

[–] [email protected] 6 points 9 months ago (1 children)

I have experience living as a human

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[–] [email protected] 6 points 9 months ago (1 children)

I have experience with stating correct opinons

[–] [email protected] 6 points 9 months ago (2 children)
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[–] [email protected] 5 points 9 months ago

'Something' is what we abstractly call that which is both not nothing and has some significance to us beyond being merely anything.

[–] [email protected] 4 points 9 months ago (1 children)

Ok who's idea is this? I want a name.

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[–] [email protected] 4 points 9 months ago

I know nothing about anything.

[–] [email protected] 4 points 9 months ago* (last edited 9 months ago) (1 children)

I heard Farmer's know a thing or two, because they've seen a thing or two.

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[–] [email protected] 4 points 9 months ago

I got experience with yo Mama's ass

[–] [email protected] 4 points 9 months ago

I know a guy, I'll hook you up

[–] [email protected] 4 points 9 months ago

I like beans

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