Skip Navigation

InitialsDiceBearhttps://github.com/dicebear/dicebearhttps://creativecommons.org/publicdomain/zero/1.0/„Initials” (https://github.com/dicebear/dicebear) by „DiceBear”, licensed under „CC0 1.0” (https://creativecommons.org/publicdomain/zero/1.0/)T

Thorry84

@ Thorry84 @feddit.nl

Posts
4
Comments
522
Joined
2 yr. ago

  • YSK: You can make supercapacitors out of cement, water and carbon black

    Jump

  • YSK: You can make supercapacitors out of cement, water and carbon black

    Jump

  • YSK: You can make supercapacitors out of cement, water and carbon black

    Jump

  • YSK: You can make supercapacitors out of cement, water and carbon black

    Jump

  • YSK: You can make supercapacitors out of cement, water and carbon black

    Jump

  • Living life in peace

    Jump

  • The monkey paw curls: all insects and other "bugs" are gone now, the food chain collapses bottom up and the human race is just about extinct within 10 years.

  • looking for a RDP client

    Jump

  • +1 for FreeRDP, I use it all the time!

  • how do I stop itching?

    Jump

  • What did the doctor say? You may have a fungal infection, where the welts and itch aren't caused by dryness or the scratching, but by the fungus. It's actually really common and can be extremely annoying if left untreated. Some miconazole nitrate cream can really help out with this, just a few weeks of applying twice a day and it'll clear up.

    But never take medical advice from the internet, go see a doctor and ask them what to do.

  • What's up with all the moth memes?

    Jump

  • Return to beans!

  • Healthcare pls?

    Jump

  • But he'll throw in a slightly fucked couch for free!

  • I have discovered chat IS cute and so are you <3

    Jump

  • Thanks for not giving in to the Debbie Downers. Confirmed mods are cute as well <3

  • I have discovered chat IS cute and so are you <3

    Jump

  • Chat is in the chat room, so if you are in the chat room, then yes.

  • It isn't fair

    Jump

  • Hair is 100% genetic, products ain't going to do shit about that. It's all just a scam targeted at insecure men who want to achieve unrealistic body standards pushed by society. Just own the bald, or don't, do what you want to do and fuck society.

  • If you were to launch a rocketship parallel to the earth, on wheels, how big would the ramp have to be to get it into space?

    Jump

  • Yes

    As long as the object doesn't reach escape velocity, it's in orbit and thus bound by the primary object. Now this orbit can by very weird and huge, but it's still a loop. Only above escape velocity does the loop "break" and leaving the object without a guaranteed return is possible.

    So in theory if an object is in orbit and the boost is sufficient, it can just leave. However even then it is subject to the gravity fields and will make an arc instead of just a straight line. So "point and shoot" is never really an option. But often in movies a small spacecraft is seen making a small maneuver and somehow being seen as lost to space. That will for certain not be the case, a small boost just gives you a different orbit, but an orbit still.

    For example the movie Life (2017) comes to mind. Spoiler alert. In the end they decide to use an escape pod to launch into "deep space" with the alien. The escape pod just points up and fires the rocket for a short while and now is lost to deep space forever. This is total nonsense. The reason escape pods can work with very little fuel is they often have just enough oompf (or delta-V if you want to be technical) to put the pod into a slightly lower orbit. This lower orbit means more drag from the atmosphere which slows it down further, lowering the orbit again etc. until the thing is slowed enough it can totally re-enter and land. It isn't like an escape pod pointed down goes to Earth and pointed up goes into outer space. The pod actually fires in the direction of the orbit, so horizontally, in order to slow it down.

    Orbital mechanics get really weird really fast. For example slowing down can cause the orbit to become higher before it goes lower. And putting in energy sideways can alter the angle of the orbit just like those spinning flywheel desk toys. Playing around with orbits in Kerbal Space Program can give a better understanding and can even make the concept of delta-V very easy to understand. KSP players would be unable to watch the movie Gravity (2013) for example without screaming at the screen: "THIS IS NOT HOW ANY OF THIS WORKS".

    It's hard to figure out, that's why we refer to hard things as "rocket science". It's not just the complexity of the rocket as a machine and engineering challenge. But also figuring out stuff like orbits, taking into account the different gravity fields of objects that are of note. Doing things like gravity assists or Hohmann transfer orbit, taking into account the influence the extremely thin atmosphere has. And remembering everything moves, so shoot for where the target is going to be, not where it is now.

  • Vibe coding is to coding what microwaving is to cooking.

    Jump

  • And because the food was frozen and is thawing because of the ambient heat, people will point and shout: "SEE! It is working! I am actually heating the food with my heat-ray vision!"

  • If you were to launch a rocketship parallel to the earth, on wheels, how big would the ramp have to be to get it into space?

    Jump

  • You are very welcome! <3

  • If you were to launch a rocketship parallel to the earth, on wheels, how big would the ramp have to be to get it into space?

    Jump

  • There is a few different concepts here in conflict, which is why the question is hard to answer.

    What do we mean when we say space? Usually we mean above the Kármán line, or above 100km. At that point you are above almost all of the atmosphere, so we consider that space. The atmosphere does actually extend quite a bit above that, but at that point it's so thin we consider it to be space.

    However as we know, the Earth has a bunch of gravity from its mass. So when you get up to 100km you just fall back down. Space isn't free of gravity, the gravity of the Earth extends basically forever. It's influence does get less (thanks to Newton we know by how much), but considering the Earth is thousands of km wide when we get up to 100km we are pretty much still on the ground as far as gravity is concerned.

    So why do we see astronauts fly around? They are weightless, so there is no gravity right? This is something popular media gets wrong a whole bunch, it's not like there is some magically line called space and beyond there you are weightless. Those astronauts are actually in orbit, that's why they don't experience gravity from the Earth. To understand orbits, imagine we fire a big ass cannon. The ball flies through the air in an arc and lands on the ground. How far away it lands, depends on how fast we shot the ball. The faster it went out of the cannon, the further it flies. Now imagine we shoot the ball over the horizon, so it lands so far away we can't even see it anymore. It still lands right? Yes, but only up to a point. It turns out if you shoot the ball fast enough, the arc just continues falling beyond the horizon until it loops around the Earth. As it is falling, it doesn't experience gravity except for the arc it follows.

    Usually when we put stuff into space, we mean put it in orbit and especially something called Low Earth Orbit . That means it needs to have a speed just like the cannon ball, to keep falling indefinitely. The speed we need is dependent on how large the arc we want to have, or in other words how high the orbit is above the Earth. For context, if we want to fly in orbit in space so at an altitude of 100km, we would need to go almost 28254 km/h. Imagine driving that fast on the highway, it's crazy fast.

    That's why we use rockets, it's not as much about going up, it's more about going really fast. So a rocket takes off and goes vertical for the first bit, this is to get to a thinner part of the atmosphere to reduce drag. Then it does something called the pitch over maneuver, usually in the form of a gravity turn. This is to go mostly horizontal and get that speed up. At the speeds rockets are going, they get to the 100km altitude in no time. So they pitch over as to not overshoot and use all their energy to go as fast as they can horizontally and thus into orbit. Then you get into the realm of orbital mechanics, which popular media also gets wrong a whole bunch. You can't just point your spacecraft into space, give it a boost and be flying off into the void forever. If you want to learn more I would recommend playing Kerbal Space Program, to get a feel for how orbits work.

    But say we are totally done with Earth and just want to leave it all behind, go into Deep Space. How would we do that? For that we need even more speed, something called escape velocity. If we get to that speed (40270 km/h), we can leave the Earth and go wherever we want, right? No not just yet, we might have left Earth behind, but we are still in orbit around the Sun. So we are still following orbital mechanics, only the Sun is the primary body we have to account for instead of the Earth. We can use orbital mechanics to fly around the solar system.

    If we want to leave the solar system, we would need to go even faster. But the issue is there is nothing out there. To get anywhere interesting, we would need to travel close to the speed of light for years. Even our fastest spacecraft are standing still compared to the speed of light, so leaving the solar system isn't very useful right now. But we do have the Voyager space probes which kinda sorta left the solar system and we got some interesting data from them, which is cool!

  • Button fly's

    Jump

  • I have both kinds and I don't really care. I just buy the pants because I like how they look, don't even check what kind of fly they have. I have the ones with a regular zipper and 1 button, zipper with 2 buttons, no zipper just buttons, a little hook thingy button and fly combination. There are more important aspects of pants for me, like the fit, feeling, price and how they look.

  • Has anyone pirated their internet?

    Jump

  • NEVER SUBBED NEVER DONATED ADBLOCK ON STOLEN LAPTOP NEIGHBOURS WIFI MOMMAS HOUSE STOLEN SOLAR PANELS STOLEN SUN SOLAR ENERGY STOLEN WATER WHEEL NEIGHBOURS RIVER STOLEN HYDROELECTRIC PLANT CHARGING PHONE WITH WORK ELECTRICITY SHOWER IN BATHROOM SINK STOLEN FOOD FROM CAFETERIA STOLEN HAMSTER STOLEN HAMSTER WHEEL KINETIC ENERGY FREE ENTERTAINMENT