Stuff you've always wondered

[little graham]

that's like the question if black boxes can survive plane crashes why not make planes out of the same material ?

That them out of the same thing they make white yellow and red ones

 

[Quivorir]

What?

 

[JUBJUB]

That them out of the same thing they make white yellow and red ones

Drunk posts are fun

 

[little graham]

Drunk posts are fun

auto correct is a campaigner

 

[JUBJUB]

How do animals know exactly where to cross on highways ?

 

[Bunk Moreland]

Why people don't appreciate Robbie Williams in this country.

I think it ended here. And rightly so btw.

 

[little graham]

How do animals know exactly where to cross on highways ?

Good point! Maybe ask a rock, they seem to know as well.

 

[Bunk Moreland]

what about a glider?

The shape/design. They're the opposite of downforce I think.

 

[Hudu Gurusingha]

I think you'll find they have the answer down to an exact science actually

Incorrect. There are still some minor things that are debated.

Some will point to Bernoulli's Law, others to Prandtl's boundary layer theory and some to the Navier Stokes equations.

http://www.thenational.ae/news/uae-news/science/the-secret-to-airplane-flight-no-one-really-knows

 

[DrKrieger]

This doesnt explain how a plane can fly upside down

Yes it does, it's all about the angle between the wing (or more specifically the chord line, between the leading and training edges of the wing) and the airflow, plus speed.

Conventional airfoils aren't super efficient upside down, but they do work. Many aerobatic aircraft use a symmetrical airfoil so it's easier to handle upside down, symmetrical meaning the top and bottom surfaces are exactly the same. It's not necessary to have that design though.

 

[Simple Jack]

The shape/design. They're the opposite of downforce I think.

All aeroplanes/gliders fly the same way. The thrust of the engines is to provide the forward motion required to get enough relative airflow over the wings to create lift. That's why a 747 can lose all power and still glide at quite an impressive rate for something that massive (and has: see BA009).

This doesnt explain how a plane can fly upside down

They quite often can't fly upside down and maintain height. But if you're talking about an aerobatic aircraft/fighter they have near (or completely) symmetrical aerofoils. The type of wing in that video has positive camber, which means that at a high enough airspeed the aeroplane will be able to maintain height at 0 degree or even a slight negative angle of attack. A symmetrical wing that has no camber will not climb at a 0 degree angle of attack however it will be just as effective upside down as right side up.

 

[DrKrieger]

All aeroplanes/gliders fly the same way. The thrust of the engines is to provide the forward motion required to get enough relative airflow over the wings to create lift.

And helicopters, if you want to get really complicated. The engine moves the rotor (very similar to a wing) through the air, which gives the aerofoil the speed it needs to create lift, it just moves in a circle instead of moving through the air with the aircraft. Same principle though

(somehow I suspect you may have a slight idea about this already though )

 

[Hudu Gurusingha]

Where do snakes go and hibernate over winter?

 

[Bunk Moreland]

Where do snakes go and hibernate over winter?

Mine goes to your mother's.

 

[Quivorir]

 

[I Lost My Keays]

What does numbers on the barcodes mean?

If our blood is red , why is our veins blue?

 

[Quivorir]

Veins are blue is something to do with light getting through the skin, and not the "blood turns red when oxygen gets to it (derp)" which is always said.

 

[Bunk Moreland]

What does numbers on the barcodes mean?

If our blood is red , why is our veins blue?

The numbers are the product code. The bars are just the scannable representation of the bars.

On most retail systems, if you'd can't scan the bars for whatever reason, you can punch the numbers in and it'll work.

 

[TheLoungeLizard]

Who is that Essendon poster with Robbie as his avatar?

Robbies problem was he took too many drugs, released some weird songs and needs to go back to his earlier sound.
fortunately his new tour of Europe is exactly that.

 

[tangolikelama]

Does size matter?

 

[GPW1]

why there are so many school aged kids at the shops with their parents during the day? they cant all be off crook/curriculum day/home schooled. why aren't they in school?

 

[tangolikelama]

why there are so many school aged kids at the shops with their parents during the day? they cant all be off crook/curriculum day/home schooled. why aren't they in school?

School holidays

 

[Ahern2Boof]

The numbers are the product code. The bars are just the scannable representation of the bars.

On most retail systems, if you'd can't scan the bars for whatever reason, you can punch the numbers in and it'll work.

Not all the time.

 

[GPW1]

School holidays

I realise it is school holidays at the moment, im talking about out of school holidays periods.

 

[kfc1]

I've always wondered why the Chinese didn't invent forks. They invented pretty much everything else; surely somebody would have realised at some point that two blunt sticks isn't the most efficient way to convey food into your mouth.

A work colleague with a history bent was telling me over Christmas beers that the Chinese had a change in dynasty and became very insular around the time of the iron age in Europe, so the invention of cutlery didn't reach them as it would have when trade was more open.
No idea whether that is remotely accurate but seemed to make sense.