/sci/ - Science & Math

>>2815969
actually, this can be done, in space

>>2816002
Fill me in on why this wouldn't work?

>>2816017

You can't fill something with a vacuum.

A vacuum is the absence of matter.

>>2816002
I've always been curious about this. I know it wouldn't get up to space - but would it float?

>>2816026
But say you sucked all the air out of it, thus creating a vacuum?

>>2816002
not sure why not. Perfect vacuum not achievable.
>>2816006
this is how lasers work.
>>2816009
Imagine a spinning disk and measuring the velocity close to the centre compared to the edge.
>>2816013
this works fantastic in GMod.
>>2816021
works. not viable.
>>2816030
Speed of sound, do you speak it?

>>2816043
helium has a negative mass relative to normal air
vacuum doesn't have mass at all, since it is, by definition, the absence of anything

>>2816080

Shits just an over the top nuclear reactor yo.

>>2816126
how's that?

>>2816043
tl;dr version of the below: it's possible but a stupid idea

First proposed by Italian monk Franceso de Lana in 1670, the vacuum balloon would be the ultimate expression of displacement lift power. A frequent topic of blue sky thinking, the basic principle has remained the same: A container strong enough to preserve a vacuum that displaces sufficient air to lift the container and an additional load. However, construction of a container strong enough to withstand atmospheric pressure while at the same time being lighter than the air it displaces is not yet a reality, though some discussion exists.[6] A vacuum balloon would have a buoyancy[1] of 1.292 (g/L) at sea level making its "fill" 16% more efficient than helium and 7% more efficient than hydrogen. However the weight of the container will be much greater than those for hydrogen and helium because of the large strength and stiffness required to prevent collapse. (Hydrogen and helium have pressure; vacuum does not.) Thus the total lifting power of a "vacuum balloon" will likely never exceed that of hydrogen or helium.

>>2816030

Anyone give more info on this one? It may be because I'm an ignorant but it made me question things. :P

>>2815946
too lazy to paste in trollface, someone else do it

>>2816137

A nuclear reactor works pretty well exactly the same way, except you dont have to dig down to the center of the fucking planet to do it.

Nuclear reactions generate heat which boil water which makes steam which creates power.

>>2816140
>reflects no light
I think it means to say reflects ALL light.

>>2816144
I think one of Einstein's theory's suggests that an object in it's entirety does not exists in it's hole during a single period of time.

To answer your question. it would take one year for the "bump" to exist on the other side.

>>2816171
It would take longer than a year. The compression wave it creates would probably only travel at the speed of sound (of the material of the stick).

>>2816167
>>2816167
Jesus Christ, that would be awesome if it worked.

>>2816186
Thanks to blue shift, something like that would work. He would bombard earth with gamma rays instead of visible light.

>>2816191
So, jump in front of Space Hadouken for Hulk transformation? Eh, sounds plausible.

OP here. Finally spent.

Hope everybody learned something today.

Iv still yet to see one i saw ages ago. About masses rotating on a wheel with 9kg showing on the way down and 6 on the way up giving perpetual motion.

Anyone have it?

Easy-to-visualize solution to the "vacuum" troll:

Take a plastic ziploc bag, squeeze the air out, then close it. Does it float?

The real solution:

Lighter gasses provide a net force up while a vacuum does not provide a force at all. In order to have a net force up you need a gas which is considerably lighter than air AND it outweighs the force of gravity downward on the matter in which it is encased in. For example, even though helium is lighter than air, you still need a decent amount in a balloon in order to make it rise since it has to overcome the weight of the rubber.

Pic related. In a vacuum, there would be no net force upward.

>>2816154
>>2816137
>>2816126

I see neither of you have heard of geothermal energy before.

>>2815946
water's molecular structure makes it slightly magnetic, the metal particles are extraneous

>>2816347

we're talking about a vacuum that takes up a volume. The ziploc bag example doesn't apply since it implodes in on itself. It's basic bouyancy, if the object is less dense than air, it will float.

>>2816393
haha, thats ridiculous

>>2816508
Now I want to find a way to make a bag float.