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is there anything you ALWAYS WANTED TO KNOW?

What is the best type of electrical heater to buy to heat a fairly large room (5x5 sqm) ? What is the difference between radiant and convection heaters?
 
^^ The humble bushfire tm seems to work well round these parts:

bushfire-pic.jpg


;)
 
Why won't this stupid infra-red recievy thingie recieve the stuff i'm trying to send it???

and more importantly, what's the point in having a boyfriend who can fix these sorts of problems if he's off gallavanting and having a pub lunch??

:X
 
Girlies, search this thread for water, bathroom, kitchen (or some such).

Personally I can't drink bathroom water, it's all about kitchen for me. I'm sure 98% of that is my brain going 'ew that's the bathroom' though.
 
An' Refuse To Touch Him Until He Fixes It

Maybe it reaches the pipes inya bathroom
first,
an' it's got tired of bein' tasty
by the time it reaches a the sink.

Antywars,
it's yo' boyfriend's fault,
an' he should fix it.

Jus' say you say a bug down there or something...
;)
 
MoeBro said:
heat is kinetic energy, increased movement of atoms in the heated region.
Atoms moving more means they take up more space, they expand.
The same mass of air in a larger area has a lower density than a similar mass of air in the original smaller area.

Less dense stuff is displaced by more dense stuff.

thus, hot air rises.

i hope that made sense.
Click to expand...
Thank you Mr Moebro.

Next question. Same topic.
What happens if you generate kinetic energy (heat, as you said) in Space? Where do the fast moving atoms go?


Also, another question...well not really a question. More a random stoner thought.

A mirror is just reflecting light, right? If I were to time how long it takes for the flashlight in my hand to generate (more) light to reach my eye, I would end up with a result of the speed of light right? Here are my questions....

Does the mirror act as a delay? (does it take light longer to deflect off the mirror/surface)
AND
Would it be possible to reflect light faster than the speed of light?
AND
Is this just a stupid stoner thought - and should I stop thinking?

=D
Thanks!
 
up all night said:
Why does water taste so much better from bathroom taps?

Maybe that's just me. And I don't mean public bathrooms.
Click to expand...
Think about how much water goes through a kitchen tap, compared to a bathroom tap. ie: more water=more That's what I'd assume anyways. Plus you've got all the nasty food scrap loving bacteria thats a spout away from making UAN water yukky.

Also, it's a secret. Keep the kitchen tap drinkers away from our bathroomy goodness!
 
up all night said:
Why does water taste so much better from bathroom taps?

Maybe that's just me. And I don't mean public bathrooms.
Click to expand...

Dr. Karl suggested an experiment about this a month or two ago. I don't know what the results were but I agree with you entirely. I think it has something to do with both the temp. of water from bathroom taps and the lack of association with seedy kitchen things.
 
xcidium said:
Thank you Mr Moebro.

Next question. Same topic.
What happens if you generate kinetic energy (heat, as you said) in Space? Where do the fast moving atoms go?


Also, another question...well not really a question. More a random stoner thought.

A mirror is just reflecting light, right? If I were to time how long it takes for the flashlight in my hand to generate (more) light to reach my eye, I would end up with a result of the speed of light right? Here are my questions....
Click to expand...

There are very few atoms in space.
ie. Virtually none.
Heat in space would only be emitted as infra-red radiation (in electromagnetic spectrum. energy carried by photons, not atoms).

Going by what I know of physics, and no new, random crackpot theories created and accepted since then, light speed is a constant. I'm almost certain that it remains at its constant velocity regardless of whatever material it travels through, thus the mirror wouldn't slow it down. Not 100% certain on that though.

You can't accelerate anything faster than light speed. not even light.

Moving the mirror towards (or away from you) you would result in more closely grouped packets of photons (brighter light or weaker light, depending on movement). Heard the phrase Doppler shift, or Doppler effect? That would be it.
 
MoeBro said:
Going by what I know of physics, and no new, random crackpot theories created and accepted since then, light speed is a constant. I'm almost certain that it remains at its constant velocity regardless of whatever material it travels through, thus the mirror wouldn't slow it down. Not 100% certain on that though.
Click to expand...

That's not quite true Moe, and here's something i grabbed off a random site on the internet that proves that i'm right that i used to back up my vague memories with real actual explanations (tm)...

Newton's experiment
When a narrow beam of light strikes the face of a glass prism at an angle, some is reflected and some of the beam passes into the glass. All light travels at the same speed in a vacuum, but in transparent matter, Newton hypothesized that different colors (frequencies) move at different speeds. Red light moves more quickly in glass than violet light and it bends (refracts) less sharply. A triangular prism is shaped to bend the light twice, and disperse it as much as possible. The result is the spectrum of colors.
Click to expand...
 
Does shining a flashlight into a mirror and timing it give you half the speed of light? Would you wait for the light to get to the mirror, and then to get back again?
 
By time you see the light it was already travelled twice the distance between you and the mirror, so you'd just fator that into your calculation.
If you were standing 1 meter from the mirror and flsh the light, the distance that the light has travelled in the time that you record on your stop watch is 2 meters... then you'd calculate it from there (though I doubt you'd be quick enough on the stop watch).
Strangely enough, I have a feeling this is how someone roughly estimated the speed of light for the first time, though the mirror was on an opposing mountain top (I don't know where I heard that story, so most likely not true).
 
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