Things you always wanted to know the answer to [Vol. 2]
Discussion
Justin Cyder said:
When you overload an electrical circuit, the fuse heats up & the wire melts, breaking the circuit, preventing all kinds of fire related unpleasantness. Since the breaking of the circuit depends on gravity to remove the melted fuse wire from the circuit, what do they use in space craft?
Fusewire is hardly used these days - all circuity is protected by mcb's and rcd'sJustin Cyder said:
When you overload an electrical circuit, the fuse heats up & the wire melts, breaking the circuit, preventing all kinds of fire related unpleasantness. Since the breaking of the circuit depends on gravity to remove the melted fuse wire from the circuit, what do they use in space craft?
Circuit breakers?
Justin Cyder said:
When you overload an electrical circuit, the fuse heats up & the wire melts, breaking the circuit, preventing all kinds of fire related unpleasantness. Since the breaking of the circuit depends on gravity to remove the melted fuse wire from the circuit, what do they use in space craft?
About 1.8 mil, 7 bedrooms and 10 acres. Glocko said:
How many wheely bins worth of rubbish can an average bin lorry hold?
Depends on what's in it.A 240l bin has a maximum weight capacity of about 80kgs.
A typical collection round serves between 800 and 1,200 homes and a collection round is generally defined by the point a which a truck gets filled up.
Justin Cyder said:
Seems legit. On a related note, where you have machines like tv's or anything that produces heat, on Earth, it rises. In space, presumably that doesn't happen so do they need fans on everything to blow hot air away from electricals to keep them from being bathed in their own heat?
Seems NASA has already thought of this. Whodathunkit?http://www.nasa.gov/topics/technology/features/the...
andygo said:
P-Jay said:
I should start by saying I'm a very keen cyclist and not some d
head cycle hater, but the simple answer is that they're aholes.
The more complex answer is:
Riding in a tight group is easier, the head of the group breaks the wind resistance giving the following riders an easier time, even at a very high level of competitive racing competing riders will take their turn at the lead.
Also, it's more sociable, it allows you to chat away with your fellow riders.
And finally it's their right - the law is straight forward, there is no second-tier road users, if you're on the road than you have every right to your entire lane, so why not share it with your fellow riders - it's one of the first thing they teach you when you do your CBT / Bike test.
So, it's more efficient, more sociable and perfectly right and legal - which of course doesn't make it MASSIVELY ANTI-SOCIAL, the reality it most riders are total fantasists, from their Rapha Sky replica strip to their £10k carbon wonderbikes that are completely wasted on them, truth is their formation isn't nearly tight enough to be aerodynamic, they never talk to each other than taking up so much pointlessly just pisses everyone else off.
Legally right, morally wrong, but that's just my opinion.
Well that would explain why two mates and I got stopped one evening for riding 2 abreast with me in front. We had mega lights, proper gear on and were riding along a well lit street. We took up significantly less room than, say, a Police horse....Oh, and we didn't do random poo's as we rode, unlike a police horse.head cycle hater, but the simple answer is that they're aholes.The more complex answer is:
Riding in a tight group is easier, the head of the group breaks the wind resistance giving the following riders an easier time, even at a very high level of competitive racing competing riders will take their turn at the lead.
Also, it's more sociable, it allows you to chat away with your fellow riders.
And finally it's their right - the law is straight forward, there is no second-tier road users, if you're on the road than you have every right to your entire lane, so why not share it with your fellow riders - it's one of the first thing they teach you when you do your CBT / Bike test.
So, it's more efficient, more sociable and perfectly right and legal - which of course doesn't make it MASSIVELY ANTI-SOCIAL, the reality it most riders are total fantasists, from their Rapha Sky replica strip to their £10k carbon wonderbikes that are completely wasted on them, truth is their formation isn't nearly tight enough to be aerodynamic, they never talk to each other than taking up so much pointlessly just pisses everyone else off.
Legally right, morally wrong, but that's just my opinion.
I haven't always wanted to know this, only since about five minutes ago, but what in the fk is a targental?
As for fuses and cooling in space, really interesting questions, you've got me thinking
Wuldn't it be easy to install the fuse wire in bending so that it is a spring and once it breaks it springs apart. In fact they might all work that way?
For cooling, fans are normal anyway, which is fine if there's air, for stuff inside, but how to get the heat out of the spacecraft or cool components mounted outside? That there article implies that liquid cooling is common, but the whole electro pump thing? Now that's neat. Seems it'd be a bit power hungry in its self though, the ion wind idea has been around since dinosaurs, I'd always thought it was just too inefficient to be useful, although wiki implies it's actually fairly efficient at low speeds, but the surface area thing sounds a tad impractical, as is actually having all that electrical energy up in the air I guess.
eta: apparently the ionised air also causes cancer..
k is a targental?VladD said:
I'm going slightly targental here
Liquid lunch?As for fuses and cooling in space, really interesting questions, you've got me thinking
Wuldn't it be easy to install the fuse wire in bending so that it is a spring and once it breaks it springs apart. In fact they might all work that way?
For cooling, fans are normal anyway, which is fine if there's air, for stuff inside, but how to get the heat out of the spacecraft or cool components mounted outside? That there article implies that liquid cooling is common, but the whole electro pump thing? Now that's neat. Seems it'd be a bit power hungry in its self though, the ion wind idea has been around since dinosaurs, I'd always thought it was just too inefficient to be useful, although wiki implies it's actually fairly efficient at low speeds, but the surface area thing sounds a tad impractical, as is actually having all that electrical energy up in the air I guess.
eta: apparently the ionised air also causes cancer..
Edited by scarble on Wednesday 1st October 09:27
TheEnd said:
The fuse wire melts, so it doesn't fall away from gravity, there's a bit missing.
I've seen the aftermath of someone hammering a metal roadpin into an 11kV cable and there was about a meter missing.
In zero gravity? If there's no gravity to draw the melted part of the fuse away, what's to keep it from staying put & reconnecting the circuit?I've seen the aftermath of someone hammering a metal roadpin into an 11kV cable and there was about a meter missing.
They'll burn up the middle part of the wire, and form into two blobs of metal at each side.
You can see a little of the gravity bending things down, but you can also see there's a large bit of wire missing.
There's another one, blobs in different directions as the melting metal pulls itself into a ball from surface tension.
You can see a little of the gravity bending things down, but you can also see there's a large bit of wire missing.
There's another one, blobs in different directions as the melting metal pulls itself into a ball from surface tension.
In space?
Well, most fancy things like planes etc, and even race cars use breakers, so you don't need a collection of spare fuses, you just flick a switch and everything is OK again.
It saves routing round in the kitchen drawer on the shuttle looking for 7.5A when all you can see are 10's!
Well, most fancy things like planes etc, and even race cars use breakers, so you don't need a collection of spare fuses, you just flick a switch and everything is OK again.
It saves routing round in the kitchen drawer on the shuttle looking for 7.5A when all you can see are 10's!
Ayahuasca said:
Seems NASA has already thought of this. Whodathunkit?
http://www.nasa.gov/topics/technology/features/the...
That's cool. (Sorry!)http://www.nasa.gov/topics/technology/features/the...
This is probably common knowledge to many, but why do engines in high states of tune seem to idle in barps, or even worse, sound like spanners going round in a washing machine?
This Audi rolling off the ramps from the youtube thread is a good demonstration:
https://www.facebook.com/video.php?v=1015269561883...
Why is incapable of a smooth idle? Or would it be able to idle smoothly, but only at 3000 RPM?
This Audi rolling off the ramps from the youtube thread is a good demonstration:
https://www.facebook.com/video.php?v=1015269561883...
Why is incapable of a smooth idle? Or would it be able to idle smoothly, but only at 3000 RPM?
Gassing Station | The Lounge | Top of Page | What's New | My Stuff