/sci/ - Science & Math

you would have to close the box faster than light for it to work

now, someone explain why this wouldnt work?

Sure. If you close the box faster than the speed of light
>trollface

>>4224982
this is so wrong i can't even imagine why you would think it might work

why do you?

B-b-but doesn't light dissipate?

Mirrors aren't 100% reflective

>>4224989
it's called a gyroscope broski, and it would work for the dust particles and whatnot in the air, just not anything remotely human sized.

What the fuck man what about this one?

>>4224997
Oh come on, that one's just complete bs

>>4224997
Oh, man. 10/10.

Reverse trolling at its finest.

>>4224997
go read wikipedia on how lift is created.

also, stability.

>>4224982
If hula's weren't affected by gravity, yeah. With high centrifugal forces tho, and no friction.

>>4225008
There's a back rotor on that picture.

>>4224972
There are some mirrors that will allow light to pass when going from one side, but not from the other.

Build your box with those - free light source! Or stole shitload of light inside - you can blind anyone! Or create kind of a prism out of it, and store fuckload of light - you've got light sabre!

Or build it very vig, and leave it on a sunny place for a few years - you've just created artificial sun!

>>4224982
It's not a correct argument because you could let the flashlight inside. The correct argument is that mirrors don't reflect light perfectly, they absorb a small percentage of light. Suppose the mirrors reflect 99%, after a ray has been reflected 100 times there's only 37% left. And that's only after 0.3 nanoseconds assuming a box width of 10 cm.

As for the centrifugal forces, their contribution in your example is purely horizontal so it doesn't affect trollface's vertical acceleration: he falls.

>>4224995
the hoolas or whatever they're called have kinetic energy
by shifting your body you let them climb upon you

but while climbing they exert a downward force on you which you counter with your legs on the ground

in the best case scenario you can only delay your fall with a tiny bit before falling down but this will be a really tiny bit cause the rings/hoolas/whatever have small mass

even in gases the more energetic particles need to push other particles down in order to go up

energy is volatile and changes the forms it takes constantly.

it's wrong simply because there would be heat and it would dissipate.

closed systems do not exist in real life, they are just a simplification.

there are no self-sustaining infinite energy generators or engines.

>>4225017
If you could do this, then this pic is also possible. Since light can be crammed in an infinitly small space, you get thousands of those cubes made of one way mirrors/glass. When they have enough light you poke a hole in them one at a time. Each time you poke a hole in one, you'll get a boost of acceleration. Eventually you could reach the speed of light.

You can't disprove this one!


What is fire for that matter? As in, what's the physical 'composition' of it? I know that it's mainly carbon and oxygen, but how come that the fire takes certain shape and not the other etc?

TL;DR - fucking fire, how does it work?

flames, or "fire", as you may call it, are just the gases burning.

>>4225037
that's fucking simple but to long to explain
and i'm fucking lazy read it on wikipedia

>>4225037
Fire is just very hot air. As anything sufficiently hot, it emits visible light. It's lighter than cool air so it goes up, and as it does it cools down until it doesn't emit visible light anymore.

>>4225037
>>4225041
burning is the sudden break of electron bounds in molecules
the light you see is from gases forming new molecules(smoke), emitting photons
that's why different things burn with different color

the shape of the fire is due to gravity
hot air wants to go up that's why it's elongated upwards

>>4225042
fuck me i ended up explaining the shit

>>4225054
different color fire is due to a different element being oxidized.

herp derp.

>>4225070
what do you think oxidation is?

>>4225078
i fail to see where you actually mentioned oxidation.

>>4225054
thanks brah, seems logical

>>4224992
this.

Mirrors still absorb some of the light.
So no.

And yes, all troll physics comics will never work. If they do, then you wouldn't call them "troll" physics comics.

>>4225101
explain
>>4224997

>>4225101
See
>>4224997

Why would you need to close the box faster than the speed of light? What if the box was 299,792,458m long, then you'd have a whole second to close it. Fucking morons, you should at least be able to properly debunk these things.

>>4224997
>>4225002

Thanks these are fresh

>>4225085
>forming new molecules
notice that most of the light comes above the place that is burning

for example the light bulbs with wolfram wires
shine because their molecules are vibrating really fast
and there the light comes directly from the metal wire
and it doesn't matter what metal you heat
they all start glowing from red to white

and finally in LED light comes from excited electrons recombining with holes
there you can only have 1 color

>>4225155
being on the subject you should never try to extinguish a fire if the metal near it is glowing white or almost white

the water molecule will break and hydrogen explosions may occur

also when i said 1 color light i meant 1 wavelength physicists call it monochromatic light (i'm no physicist)