p1t1o
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Posts posted by p1t1o
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Lunar submarines.
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1 hour ago, kerbiloid said:
Its travel capability would drastically increase because there are no rivers on the Moon. No rivers - no bridges.
It does have seas though...
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1 hour ago, wumpus said:
It would be 50/50 if and only if you could consider them separately. If you said the elder (or younger) was a boy then the other would be 50/50. But since they are lumped together and all you know is that one is a boy you get 1/3. This is basically the Monty Hall paradox. And yes, the wording of where the givens are lends itself to mistakes.
But they are seperate. The fact that there is an existing child only has an effect if they are twins. If I have a son, then I have a second child, the probability that the 2nd is a boy is exactly the same as the 1st.
Its not like a lottery draw where you have to match each number, we are given the first result. It is like asking "you meet a woman with her 6 lottery numbers, the first 5 are 1,2,3,4 and 5, what is the probability that the 6th number is 6?" (lets say the lottery is drawn from 49 numbers and for the sake of argument, lets say each number can be drawn, multiple times)
The probability of the 6th number being 6, is not the same as the probability that the winning combination is 1,2,3,4,5 and 6. The probability of the 6th number being 6 is 1:49 - not 1:14000000
The answer would be 1/3 only if we are not initially given the sex of one of them. This is only like half of Monty-Hall, we are not given any choices, only asked a probability of one outcome - we are not asked how a change in the situation might affect said probability.
Disclaimer: Im like 70% certain in any of this.
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20 minutes ago, Reactordrone said:
One of them is a boy, so the chances of the other one also being a boy is zero otherwise two of them would be boys :p
You're not wrong.
Although "one of them is a boy" is correct no matter what the other one is.
Semantically, it works both ways.
My fave answer so far however
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It would help if we knew whether or not the children are her biological offspring or not, they, or one of them, could be adopted, which throws a spanner in the genetics angle.
Then you could start talking about the probability of boys or girls being put up for adoption but that seems like too much detail for this question. It doesnt seem like a question that is supposed to be solved by researching census figures.
Im tempted to say that due to so many unknown factors, and given two possible outcomes, the probability defaults to 50/50.
Its either that or it tends towards the probability that any given developing fetus turns out genetically male (just off 50/50).
The identical twins thing seems relevant, but it can only change the probability either way, by quite a small amount.
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You wouldnt ask the question unless the answer was surprisingly simple, or surprisingly complex. I think simple is more likely as you came out and said almost as much.
So on that basis, the answer is almost certainly 0, 0.1, 0.25, 0.5, 0.75 or 1.
0 and 1 are out, naturally, and I think 0.1, 0.25 and 0.75 are out-of-scope.
So again, 0.5 or 50/50.
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1 minute ago, MinimumSky5 said:Are you sure its not 1*0.5=0.5 ?
As we know the first child is a boy, the probability of the first child being a boy is 1.
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6 minutes ago, tater said:
Really? I hate that movie almost as much as I hate "Starship Troopers" (they should not have been allowed to use the name). Much of the look of it is OK, but paul is too old, the thopters are horrifically bad, pretty much any scene where they are shooting... yuck.
I like starship troopers too, though the caveat is that I saw it first at an age where all I wanted/expected was a brightly coloured action flick with shooting and aliens.
Which, to be honest, it delivers.
Im aware of the controvercy and junk, but to a 14 year old in 1997, it was awesome.
26 minutes ago, TheSaint said:These days I hold zero hope that a Dune movie will bear any resemblance to the book. Especially with a boutique director like Villeneuve onboard. Contemplate the debacle that was A Wrinkle in Time. Hollywood is so wrapped up in its own bubble right now they've just stopped caring if anyone likes their product or not.
Indeed. And theres the concept of "development hell" and "development limbo" where film rights will be forcibly retained merely to stop anyone else making it because they might want to make it maybe, some point in the future.
You might be pleased to know that Villeneuve has said that he intends his film to be very different to Lynch's.
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And in related news today, coincidentally:
https://news.avclub.com/timothee-chalamet-might-spice-up-denis-villeneuves-dune-1827639659
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I fricken' LOVE Dune
Taste is a weird thing though, David Lynch hates his creation, but Frank Herbert thought the movie was an almost perfect representation.
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Maaaan, I had Croatia in our office sweepstake...
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4 minutes ago, kerbiloid said:
and scratch between the scapula(s).
1950s sci-fi has a lot of such tight suits. Also they could tourniquet a wound, fixate a broken limb, and so on.
Though, they look a little thin to be a rad-protection.
And a temperature gradient doesn't disappear, -100°C of your shadow side, +100°C your side under sun.
Looks not very good for EVA.Probably you should have a layer of hygroscopic and hydrophobic fibers which are pumping water around the whole body, removing sweat and heat.
If you have to jump from a wrecked ship to a rescue ship, you can just put on your head.
But if you want to EVA, you put on a cuirasse with backpack, containing energy source and additional water, pump water into your arm and leg suit parts, making them to swell (rad-protection and additional heat exchange), and then do EVA.But in this case that thin thing turns from a spacesuit into a second skin for daily wearing.
So, next step of humanity is an exoskeleton-augmented biomechanoid. (Giger bless you!)A "future suit" is unlikely to be made of a single layer of a single material, so they wont end up looking like a wetsuit, but more likely a more compact version of what they look like today.
Temperature is not as bad as it sounds. A 200 degree gradient sounds a lot but its 200deg in a vacuum, not 200deg gas or liquid. Just colouring the outside white rejects much of the incident energy and insulating materials and a temperature controlled undergarment do the rest.
Radiation wise, a current era suit doesnt provide amazing levels of protection here, they are still flexible suits only an inch or two thick, there are no layers of heavy metal cladding.
Personally I believe the [far]future of radiation shielding (below some reasonable threshold) to be pharmaceutical or genetic in nature, because you just cant get around needing mass to stop it otherwise.
Though for a token level of suit-mounted shielding, I think that a flexible layer of ultra-high-molecular-weight polyethylene would be a better alternative to a layer of water. It also doubles as micrometeoroid protection.
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6 hours ago, K^2 said:
I've been pondering about this idea. You can wear a latex suit and be, well, moderately comfortable, despite the fact that your internal pressure is fighting external pressure, with latex contributing just a touch one way or another.
In theory, one could have an electronic feedback system that adjusts elastic coefficient of a much tougher fiber, to act exactly like external pressure + light elastic of latex or similar. If you adjust fast enough, you can have freedom of movement without losing confinement. Unfortunately, the only I know how to adjust elastic coefficient quickly in this kind of range is with changes in temperature. And that... would not be comfortable. Especially, in the aforementioned areas. Still, I wonder if something piezoelectric would be viable. It definitely has the strength, and helical coils of piezoelectric fiber might even have the range.
You might complain that I'm basically trying to imagine artificial muscle, but this is different in that it needs to adjust elastic coefficient only, and it needs not be terribly efficient at it, so long as it keeps behaving roughly in accordance with Hooke's law. So it is, technically, a simpler problem.
My father heads a university department combining material science with other principles such as medicine or fashion.
https://www.northumbria.ac.uk/static/5007/despdf/events/p3agenda.pdf?view=Standard
They have been approached by some parties for some ideas on spacesuits before and apparently one of the newer challenges is tailoring! Fancy new materials dont "wear" the same way as conventional ones so they have to have dressmakers and tailors figure out the patterns.
The ideas just over the horizon include biologically derived materials, sensors (biosensors or other, such as to detect suit damage) embedded within the material layers (in some cases the fabric is literally the sensor) and 3d-printing methods of manufacture. Moving away from a pressurised envelope to an elastic design is almost a certainty.
Imagine a spacesuit that can heal itself or turn bright red if the internal oxygen concentration drops to a certain point or on that can administer drugs if it senses medical distress in the wearer.
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I have heard that they key component in a bottle rocket is the rubber bung you use.
This part decides on how well it will hold pressure and at what pressure the bung will release, launching your rocket.
Get you one which looks like this:
Should be available from many places (laboratory supplies [eg: Fisher], but also model shops and shops/sites that sell stuff for brewery). It is the key component, so spending a buck or two is warranted here.
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Kingdom Come: Deliverance
Open-word first-person medieval RPG. Its excellent.
Especially if you like armour, a full set can consist of up to 14 items.
The quality of the voice acting is notable too.
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2 hours ago, Gargamel said:
But it's very easy to forgive this, as it would be simple for them to have sort of linear accelerator involved in the launch process, be it a long hydraulic ram or a rail gun style launcher. So in the grand scope of things that are wrong in this movie, I usually let this one slide.
In that case there is zero reason why they had to be fired from point-blank range. Even fired from twice (2x very close is still pretty close) the distance they were, they' have suffered fewer losses and gotten more bombs on target.
They wanted to reproduce the dambuster raid scene in space, and it jarrs the mind awfully IMO.
The rest of the movie was pretty cool, barring one or two other instances, but I just chalk that up to "starwarsy" charm.
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Things named "foundation" always make me suspect a cult...though admittedly this would be a rather unusual one!
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1 hour ago, Nivee~ said:
So this occured to me when I was planning an interstellar mission in KSP.
In Avatar, the spaceships were accelerated from Earth via solid state lasers, and slowed down at the destination star system using antimatter/matter engines. The engines are used for accelerating from Alpha Centauri and the laser is used to slow down the ship in our solar system.
Why didn't anyone think of placing or building a solid state lasers of similar strength in the Alpha centuari system? Could have saved a lot in fuel cost, as the antimatter engine won't need to be used..
A sufficiently powerful laser would resemble a large industrial facility, not particularly easy to transport. Anyway its early days in the colonisation of the system, perhaps its under construction. Apparently it is one of the most realistic spaceships in sci-fi.
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My current sci-fi peeve is one I only recently thought about:
In many sci-fis [The Expanse in particular], ship fusion reactors can "go critical" and explode with a huge yield.
I am not aware of any fusion reactor design, nor any fusion physics concepts, that would allow a fusion reactor to "go critical" and release an explosion of energy equivalent to many seconds of normal operation. The explosions are always shown as catastrophic, megaton-class bursts, or talked about in hushed tones "You dont want to be in town if the reactor goes critical" "Lets weaponise this reactor" etc. etc.
By its very nature, a fusion reaction ceases as soon as containment fails. And a working fusion reactor will only have, at most, a fraction of a gram of fusing matter at any one time.
I mean sure, I can see it disabling the ship, or irradiating the crew, but a nuclear-yield explosion? Nah.
Antimatter is another...well, matter....but when it is specifically fusion...
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Time is not "the 4th dimension". It is sometimes useful to think of time as a dimension, but it is illustrative only.
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10 hours ago, Nivee~ said:
Yeah, it was about a dead body of an astronaut found on the moon. The only catch? The body was 50000 years old.
Pffftt, what kind of amateur, half-butted, weekend-warriror conspiracy theorist still believes in space...
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Does anyone know why the porkchop plots produced by the "transfer window planner" and by MechJeb's "advanced transfer to another planet" function, never seem to match?
They kinda match, but the plots never resemble each other and you cant plan to use one from advice from the other.
Its not a big problem, they both still have utility - cant plot nodes with TWP anyway, but you can use it in the space centre - just wondering.
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3 hours ago, StarStreak2109 said:
What is a "plernert"?
Its a type of astrernermical berdy.
4 hours ago, munlander1 said:Wouldn’t it be very short lived though?
Could be stabilised with a rapid rotation?
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1 hour ago, kerbiloid said:
Maybe you mean a rotovator.
Unlikely on Earth.
Not quite. I mean a vertical suspended cable attached to cargo, and a mass moving horizontally in relation to the cable impacts it and sweeps the cargo upwards and sideways.
Definitely an easier intercept at least, since the suspended cable is stationary and there is vertical latitude in the impact point.
I mean, I doubt its practical compared to chemical rockets, but im just spitballin'
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Could the Fulton Recovery System be scaled up to reach orbit?
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Perfectly smooth sphere of Tungsten, no atmosphere.
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40 minutes ago, kerbiloid said:
Levitation spell.
I would like to make a reservation
To spend some time in travellation
On your most space-speedy of transportation
Via your most ostentacious company,
British Space Station
Bad science in fiction Hall of Shame
in Science & Spaceflight
Posted
@NSEP
Yep, definitely an artists conception, dont forget that in 1973 the general population knew much less about space than you and me today. Much less about space travel was known at all. They all thought we'd be living on the moon in silver jumpsuits by now.
Artists conceptions, especially from that era, are definitely not winning awards for accuracy: