Did you know that ... (fun factoids)

[truc1979]

Originally Posted by JustKelli

I haven't read why but always concluded it has to do with evaporation and there is less water left to freeze once it cools and condenses. Here it gets so cold if you take a pot or boiling water and throw it in the air it freezes instantly and forms a cloud. You should see the mess dry ice and a coke bottle can make lol.

You're right. Your explanation is one of the main theory, but it's still only theory because only evaporation is not enough to explain all the aspects of that Mpemba effect. But I'm no expert, I just repeat what people told me

[JustKelli]

Originally Posted by truc1979

You're right. Your explanation is one of the main theory, but it's still only theory because only evaporation is not enough to explain all the aspects of that Mpemba effect. But I'm no expert, I just repeat what people told me

I enjoy science but most of what I know of it comes from trivia games and Bill Nye the Science guy and David Suzuki. But I do know cold water is more dense than hot so another factor in freezing ...


The average human brain contains around 78% water ... and in some the rest is air lol.

A group of frogs is called an army

A group of rhinos is called a crash

A group of kangaroos is called a mob

A group of whales is called a pod

A group of geese is called a gaggle

A group of owls is called a parliament

[JustKelli]

Okay brainiacs, right or wrong?

If you fire a bullet from the back if a train moving the same speed as the bullet will travel, will the bullet quickly just drop out if the air to the ground?

[truc1979]

Originally Posted by JustKelli

Okay brainiacs, right or wrong?

If you fire a bullet from the back if a train moving the same speed as the bullet will travel, will the bullet quickly just drop out if the air to the ground?

That's a kind of question that makes me feel mad, because I know I could answer it more easily 20 years ago than now

I would say that the correct answer is: "it depends".
It depends on your system of reference: who is watching the bullet? Is it the guy who fired it, or is it one other people watching the scene?

If it is someone out of the train, so he will "see" the bullet traveling normaly.

If it is the guy who pulled the trigger, so he will see the bullet keeping the same position (as long as he doesn't refer on the ground).

Not sure of my answer, but I'm quite sure that the good answer is about reference. Everything is about relativity, and that's what is amazing

If someone has the good answer, I'd enjoy to know it. I love questions of that kind

Cheers !

[pockets]

Originally Posted by JustKelli

If you fire a bullet from the back if a train moving the same speed as the bullet will travel, will the bullet quickly just drop out if the air to the ground?

No.

[S.B.]

If the train was running in the direction against the spin of the Earth (faster than a bullet), would it even really be going forwards?

[S.B.]

Adding one to the list of collective nouns, is this one an oxymoron?

An observance of hermits

[pockets]

Originally Posted by S.B.

If the train was running in the direction against the spin of the Earth (faster than a bullet), would it even really be going forwards?

Relatively, yes.

[JustKelli]

Originally Posted by pockets

No.

Show your work for full marks lol.


1 googol is the number 1 followed by 100 zeros. That coincidently is how the name "google" came about indirectly ...

Grapes explode when you put them in the microwave ... just sayin'

[truc1979]

Hennig Brand, a german alchemist, thought that pee was the secret key to change classic metals into gold, and used to boil his own urine to test his theory.
He finally got a glowing substance: he discovered phosphorous.