absGeekNZ
@absGeekNZ@lemmy.nz
- Comment on breakfast 1 week ago:
Well after a cup of that…there will most likely be shit
- Comment on Little Pea Shooters 2 weeks ago:
Taking the planet as the reference point. Complicates the situation a lot, but here we go.
If you contrast “A” and “D”. The initial velocity in “A” is 1, whereas “D” is 201. The acceleration due to gravity in “A” SEEMS LOWER (this is why external observer is way easier) on the way in and in “D” it seems higher. In “A” you are literally falling for much longer (gaining much more speed); than in “D”.
In “C” and “F” the situations are also different, I over simplified a bit too much. In “C” you would spend more energy than in “F”; since the acceleration due to gravity would seem higher, but not that much more. I should have made the exit angle 90°, to make them exactly equivalent…
The calculations are significantly more complex from the point of view of either the planet or space craft.
Thinking about trying to solve a real set of equations is a bit much; there are other concerns; like the fact that gravity drops off at 1/d^2^; so distance between the objects matters, the integration over distance of the equations is beyond me (I haven’t had to do that since uni, 20yrs ago). But the concepts are not too complicated; and for me at least the external observer makes it so much less complicated.
- Comment on We can't all be astronauts. 2 weeks ago:
First assume that it is a spherical cow traveling through a vacuum…
- Comment on Little Pea Shooters 2 weeks ago:
It is difficult to conceptualise.
But you also have to choose the most convenient observer to help you get it.
I would say the easiest way to “get it” would be to consider it from the Suns observation point of view. Choosing the planet or spacecraft just means that you have to consider a lot more relative motion.
- Situation A: Your space craft is catching up to the planet;
- Situation B: You have gained “29” speed as you fall toward it.
- Situation C: You spend 20 speed climbing back out of the gravity well; for a total speed gain of 9.
- Situation D: Same setup, you catch the planet quicker because it is now traveling toward you.
- Situation E: You have only gained “11” speed rather than the 29 when the planet was moving away from you.
- Situation F: You still spend 20 speed to climb out of the gravity well; for a total speed loss of 9.
This is obviously simplified and the numbers are meaningless. But the concept stands.
Depending of the incoming and outgoing angles; the energy changes are more or less…
Hope this illustrates it a little better.
- Comment on Little Pea Shooters 2 weeks ago:
No, it’s hard to explain without diagrams.
But as you fall towards a planet (any gravity well); you pick up speed, if the planet is moving away from you, you fall for longer before you catch up. As you climb back up, you don’t spend all of the energy you gained on the way down. That difference is the Slingshot effect.
It also works in reverse, if the planet is moving towards you. You catch up quicker, thus gain less speed. And spend overall more energy than you gained when you climb back out. Slowing down in the process.
- Comment on Little Pea Shooters 2 weeks ago:
You are gaining (or losing) energy based on if you are traveling in the same direction at the planet or not.
If you are coming from behind (travelling in the same direction) you an falling into the gravity well for longer. Thus gaining more energy. The extra energy is based on the speed of the planet through space.
Conversely if you an coming from the front, you fall for a shorter period. You lose energy at you climb up the gravity well.
- Comment on Heartwarming 2 weeks ago:
The children yearn for the
mineslooms - Comment on She can't cope with the stress. No problem just go through the day buzzed 3 weeks ago:
- Comment on Not stealing 3 weeks ago:
Ah yes; the tactical wees discussion.
“Yes, I know you don’t need to go right now; but we are going to be in the car for 30 - 40 minutes; go to the toilet now please!”
- Comment on Not stealing 3 weeks ago:
You are not; but they are not really assholes. They are optimising for some outcome that they want, with inferior tools/mechanisms. Depending on age, their brain runs on emotion most of the time, logic is a distant second place.
In saying all of that…they can seem like assholes in the moment!!!
- Comment on don't get too streptococci 3 weeks ago:
I got ulcers, mainly mouth and throat…
- Comment on don't get too streptococci 3 weeks ago:
Immune system: Fuck you, you’re too healthy. I’m gonna attack these healthy (rolls dice), skin cells.
- Comment on Stop children using VPNs to watch porn, ministers told 3 weeks ago:
Market research?
- Comment on Butter made from carbon tastes like the real thing, gets backing from Bill Gates 4 weeks ago:
I get that, why import stuff that you produce locally…
I try to never get imported food products that we make here… It just seems wasteful.
- Comment on Butter made from carbon tastes like the real thing, gets backing from Bill Gates 5 weeks ago:
I doubt it, I think the Miraka plant is produces mostly primary products not the secondary stuff.
- Comment on Butter made from carbon tastes like the real thing, gets backing from Bill Gates 5 weeks ago:
Pretty sure I know the factory that this butter comes from. The Miraka plant; north of Taupō. Geothermally powered, restricts it to a relatively small region in NZ.
- Comment on The virus she told you not to worry about. 5 weeks ago:
Pretty much.
The ocean is a war zone, an endless battle between bacteria and viruses. Trillions of dead every day; weapons developed and discarded as the tide of battle ebbs and flows.
- Comment on Time to pluralize titles. 5 weeks ago:
Back to the futures: quantum superposition edition
- Comment on Time to pluralize titles. 5 weeks ago:
Shaun the sheep movie
- Comment on One Angry Man 5 weeks ago:
Avenger: the reach around, it is only fair
- Comment on mogbattle 5 weeks ago:
So millihelens then?
- Comment on One Angry Man 5 weeks ago:
- Comment on One Angry Man 5 weeks ago:
Shaun the Sheep: Farmageddon
- Comment on 🐀🔥🔥🔥 1 month ago:
No, plenty of main dishes are spicy/sweet.
There also desserts and sweets that are spicy/sweet. There are some snacks that are essentially sweetened spicy fish…
- Comment on 🐀🔥🔥🔥 1 month ago:
A lot of Asian foods are spicy/sweet; it is great.
- Comment on Laxative Effect 1 month ago:
Slow clap 👏
- Comment on How to disable Microsoft Recall & stop the AI from taking screenshots of your desktop. 1 month ago:
Got very excited
- Comment on Australia to ban under-16s from YouTube 1 month ago:
Well, obviously.
Completely restricting, potentially the biggest and most accessible corpus of knowledge ever created, is not my goal.
I’m trying to balance the good with the bad here.
Example:
Lichess training embedded videos are hosted on youtube; but can just be watched on youtube directly. - Comment on Australia to ban under-16s from YouTube 1 month ago:
uBlock is my go to for killing the ads.
I’ll look into freetube, my 9yo has some cool interests but YT wants to drive engagement through whatever means necessary.
- Comment on Australia to ban under-16s from YouTube 1 month ago:
As a parent of young kids…youtube is a complicated mess.
It is full of really great content; but YT kids sucks…so if you want access to the good stuff it is standard YT.
But the utter shit that shows up in the side bar and suggested videos is insane.
For older teens/adults; you don’t have to worry about the shit tier garbage that is suggested.
I block the ads, but that is a whole other level of cringe/inappropriate content that just gets shoved into videos; completely unrelated to what is on.
