Define evolution

[s41nn0n]

The meteors that make it to the ground are actually cool to the touch. Only the very outside of the meteor is heated, and it is quickly cooled by the inside of the meteor.

ye but isnt that because it goes through the mesosphere
http://en.wikipedia.org/wiki/Mesosphere
and the troposphere
http://en.wikipedia.org/wiki/Troposphere
and as the troposphere's average temperature is +-15 degrees Celcius you can say that its sufficient to cool it down.

 

[Mumbo]

kul...
When was the moon formed.

Not long after the rest of the solar system was formed, which would be around 4.5 billion years ago. The most popular theory at the moment is that the Earth was impacted by a Mars-sized object around this time, which kicked up the material that formed the moon.

 

[Mumbo]

ye but isnt that because it goes through the mesosphere
http://en.wikipedia.org/wiki/Mesosphere
and the troposphere
http://en.wikipedia.org/wiki/Troposphere
and as the troposphere's average temperature is +-15 degrees Celcius you can say that its sufficient to cool it down.

I honestly don't know a thing about how this works, but given that hurtling through the Earth's atmosphere is what heats the meteor up in the first place, I would wager that the cooling effect of the atmosphere due to its low temperature is negligible.

 

[s41nn0n]

how can you throw something so important away so quickly.

 

[shinbits]

I honestly don't know a thing about how this works, but given that hurtling through the Earth's atmosphere is what heats the meteor up in the first place, I would wager that the cooling effect of the atmosphere due to its low temperature is negligible.

the "atmosphere" isn't really what heats it up; it's the friction from the air that heats it up, not heat itself. It's actually rather cold up there otherwise.

 

[Mumbo]

how can you throw something so important away so quickly.

(The ram pressure caused by) travelling through the Earth's atmosphere at a high rate of speed heats up the meteor. I'm pretty sure we can both agree to that. However, you claim that the meteor is also cooled by travelling through the atmosphere. While the temperature of the upper atmosphere does likely have some effect on the temperature of the meteor, the fact that the majority of meteors burn up before ever reaching the ground ought to indicate that the cooling effect isn't quite as big.

 

[Mumbo]

the "atmosphere" isn't really what heats it up; it's the friction from the air that heats it up, not heat itself. It's actually rather cold up there otherwise.

Well yes, I should've been more explicit about that.

 

[s41nn0n]

The meteors that make it to the ground are actually cool to the touch. Only the very outside of the meteor is heated, and it is quickly cooled by the inside of the meteor.

so how do you expain this?

 

[s41nn0n]

"the visibility is due to the heat produced by the ram pressure (not friction, as is commonly assumed) of atmospheric entry. Since the majority of meteors are from small sand-grain size meteoroid bodies, most visible signatures are caused by electron relaxation following the individual collisions between vaporized meteor atoms and atmospheric constituents. The meteor is just what we see."
http://en.wikipedia.org/wiki/Meteoroid taken on the 2007/08/05

showing you that it doesnt heat up with friction

 

[s41nn0n]

shinbits and Mumbo youre wrong.

 

[shinbits]

so how do you expain this?

again, the heat is caused by friction, and not actual heat energy transfering to it, the way heat energy from the sun heats an ocean. So the reason it's cool, is because there is no heat escaping it, because heat wasn't actually transfered into it.

 

[s41nn0n]

go to http://en.wikipedia.org/wiki/Meteoroid
it states there that it is not friction

 

[Mumbo]

showing you that it doesnt heat up with friction

Oops. I did tell you that I know nothing about this whole thing, right? I'm working entirely off of common sense here, and it failed miserably. Luckily, what's important in this case is the fact that the meteor is being heated, not how it occurs.

you're wrong

so are you

 

[s41nn0n]

with?

 

[shinbits]

"the visibility is due to the heat produced by the ram pressure (not friction, as is commonly assumed) of atmospheric entry.

showing you that it doesnt heat up with friction

let's look at what ram pressure is:

"In physics, ram pressure is a pressure exerted on a body which is moving through a fluid medium. It causes a strong drag force to be exerted on the body."

drag is what causes friction. But as the link says:

It is primarily this ram pressure (rather than friction) which heats the air which in turn heats the meteoroid as it flows around it.[1]

friction is a factor. but either way, the main point still stands; that it is not the transfer of heat energy, but other factors that cause the heat; and because of that, it can be cool to the touch, because there isn't heat escaping it, due to the fact that there was no heat transfered into it.

 

[Mumbo]

Your argument that meteorites are cool to the touch because the atmosphere cools them. I say that's wrong because they're heated to thousands of degrees fahrenheit at that time.

 

[s41nn0n]

now you two are contridicting each other. what's the truth and whats not.

 

[Mumbo]

now you two are contridicting each other.

Only about stuff that doesn't matter (and it really doesn't contradict that much). Give a response, please. Either that, or we can both just admit that we know nothing about physics and go home.

 

[shinbits]

I don't doubt that a meteorite can be very hot when it lands. All I'm saying is, that if for some reason it's not, then the factors I've mentioned would be the reason.

 

[s41nn0n]

wht question?