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Questions tagged [physics]

For questions regarding the physics relevant to fictitious worlds. General physics may be off-topic.

1
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3answers
109 views

Biggest possible Steampunk Airship? [duplicate]

I have noticed that one thing that is very common among steampunk airship art is that the size of the decks beneath the gas chamber is outrageously larger than that of the real world. Example: ...
16
votes
5answers
3k views

Is my plasma cannon concept viable?

I’ve developed a concept for a plasma cannon, and I need it reality-checked. The cannon would gather ammunition by pumping air into the gun through an external fan. The air would gather inside a ...
18
votes
3answers
4k views

Does water in vacuum form a solid shell or freeze solid?

I'm working on a sci-fi setting which includes an aquatic space-faring species. When a human space vessel is ruptured and depressurizes, the gas can escape rapidly and we immediately suffer from the ...
10
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3answers
398 views

Can I render satellite deployment impossible, or at least impractical, by exploiting the Kessler syndrome?

I want to render impractical the deployment of satellites by exploiting the Kessler syndrome. Why, you ask? Maybe I'm an evil overlord and I don't want those pesky satellites flying over my lair. ...
18
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5answers
3k views

How would a physicist explain this starship engine?

In my world, interstellar vessels use a drive whose design mankind learned from an extinct elder civilization. While construction of the drives is possible, the physical principles making them work ...
10
votes
1answer
115 views

Using sound to swim through sand

Subarenaceous animals are those which can move long distances through dry sand - like sandfish lizards, or Dune's sandworms. The main problem they have to tackle is turning the sand immediately around ...
3
votes
3answers
238 views

Are there any issues with this FTL drive concept?

I asked a question earlier on here concerning Negative and Heavy Matter - hypothetical types of matter I created to have a working FTL drive. With some extra work, I’ve tweaked the concept and been ...
3
votes
5answers
232 views

Actual ramifications of time acceleration

For reference, the setting is urban fantasy, with a bit of hard science thrown in. One character can manipulate time; in this setting that means he can speed up his own movement through time. One of ...
20
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10answers
4k views

Could there be a material that inverts the colours seen through it?

I had a vision of a creature that touched things, and wherever it touched, it left a mark opposite to the original colour. For example when it walked across the grass the grass had red footprints, ...
12
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12answers
2k views

Guns in space with bullets that return?

I was reading on another question (this one) and was thinking "What if those bullets could return?" What I am looking for is: Practicality Cost effective Combat effective Manufacturability
15
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5answers
3k views

How could a civilization detect tachyons?

In an effort to work out a believable form of faster-than-light communications for my setting, I've ruled out a few things: wormholes (which are in use, but are too random in where they lead, to be ...
0
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3answers
336 views

Deep space acceleration limits?

Assuming the power source for such acceleration places no limit on things, how quickly can a space craft be accelerated to the speed necessary to cross the distance between Jupiter and the sun in ...
2
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9answers
254 views

How would a fixed altitude magical Airship be propelled?

Background In my world, there are vehicles that can spatially "lock" themselves to a single altitude. The locking mechanism is a magical core, combined with runic metal bands extending around the ...
2
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1answer
103 views

Quaternionic electro-magnetism, world that it can exist in, and the appropriate equation system [closed]

The thing could not exist in real world; it is imaginary concept, expressed in a equations in a paper, that could run as a simulation on a PC. That could be interesting for people with some ...
2
votes
1answer
289 views

How effective are bows when used by a race with superior strength? (numerically)

The Situation: In this world a race of Neanderthal-like humans have grown and evolved separate from mankind in a harsh environment that forced them to be strong and warlike. Humans of this war have ...
-1
votes
2answers
51 views

Focusing solar irradiation to create equatorial conditions at the poles [closed]

As I understand it, the majority of thermal energy on Earth comes as a by-product of absorbing radiant solar energy. Since the equator gets hit by rays which are almost perpendicular to the surface of ...
2
votes
4answers
183 views

Would a person be able to punch a truck away, if his ability was to subvert “Newton's 3rd Law of Motion”?

I'm struggling with the physics here a bit since I'm a complete novice at this. I'm making a character who's main ability is to subvert/play around with the 3rd Law of motion (For every action, there'...
28
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0answers
690 views

How soon can the first stars form?

Introduction In our universe, the cosmic microwave background was formed approximately 400,000 years after the Big Bang. It was hot, but within a few million years after the Big Bang, it would no ...
1
vote
3answers
110 views

How would a person be able to attain superspeed if they could subvert Newton's 2nd Law of Motion?

I'm struggling with the physics here a bit since I'm a complete novice at this. I'm making a character whose main ability is to subvert/play around with the 2nd Law of motion. Somehow I understand ...
48
votes
13answers
10k views

Pressure inside an infinite ocean?

Handwaving the origin of one such place, imagine a universe where every part of space is filled fully and evenly with liquid water (at, say 1 degree Celsius). What would be the experience of a solid ...
1
vote
0answers
55 views

How might teleportation to or from a place far from a teleportation device work? [closed]

In many science fiction television shows, and movies characters are teleported from the space ship to a planet, and vice verse, even though the planet has no teleportation device on it's surface, and ...
16
votes
9answers
3k views

What does air vanishing on contact sound like?

I'm about to break rule seven of superpowers: don't think too hard about what it does to the air. A superhero has the ability to disappear any atoms that come within 2 cm of their skin (atoms that ...
1
vote
0answers
176 views

Creating a wormhole connecting two universes that have different elementary particles? [closed]

A civilization wishes to create a wormhole that connects two universes with different quantum fields from each other and different elementary particles to go with those different quantum fields. On ...
7
votes
3answers
435 views

Implications of cigar-shaped bodies having rings?

In my Conworld's system, There is a porous asteroid large enough to be a dwarf planet (but it's mass is too small to pull it into a spherical shape) that has rings. How they got there, nobody knows. ...
1
vote
1answer
188 views

Creating a wormhole connecting two universes with different spacetime metrics?

A civilization wishes to create a wormhole connecting its universe to a universe with a different spacetime metric. For instance if we describe a timelike dimension with $+$ symbol and a spacelike ...
7
votes
3answers
2k views

Is a self contained air-bullet cartridge feasible?

In my world, there is no access to modern or traditional gunpowder. I was wondering if a dedicated technician with a modern shop (cnc machines, and a surplus of parts and raw material, etc) would be ...
0
votes
1answer
91 views

Speed of light, Motionlessness, and Time Travel [closed]

i want to ask something I quote from some web and got this : 'According to Einstein’s Special Relativity Theory, time is affected by speed. It’s already been proven in the lab that subatomic ...
4
votes
9answers
308 views

A Nonlethal Time Dilation Field

I want a way to enclose an area (building-sized and on Earth, let's say) in a field that warps spacetime so that time appears to pass 100x slower within it. You don't need to explain how the field got ...
4
votes
1answer
164 views

What's it sound like as the airlock is depressurized?

I have a scene where an alarm is sounding in an airlock, as the pressure is lowered from normal atmospheric pressure to vacuum (takes a few minutes). How would this alarm sound to an unprotected ...
11
votes
8answers
1k views

Effects on objects due to a brief relocation of massive amounts of mass

I want you to meet Gary. Gary looks like a human, walks like a human, and talks like a human. But he's not. He's a superhero, or a magician, or... something. He's not really sure. He just knows that ...
1
vote
1answer
98 views

How would someone who could break the laws of motion apply it? [closed]

I'm working on a "Science Fantasy" story and in my story I'm trying to approach magic from a different angle. I understand this is a fictional work but I'd like to get my facts right nonetheless. The ...
7
votes
5answers
376 views

Velocity Difference From Teleportation

In Steven Gould's Jumper series, the main character has the ability to teleport, and he eventually realizes he automatically does frame matching when doing so - no matter where on earth his origin and ...
32
votes
16answers
11k views

How to tell that you are a giant?

In my novel, my main character has come from earth to a fantasy world. She has been reborn on an island of giants (10-meter tall humanoids) where everything is scaled up to match what they would look ...
1
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0answers
56 views

How would I build a civilisation of multiple worlds around multiple suns work? [closed]

I’m building a group of magical civilisations, in which there are seven suns, orbiting a much larger sun, each with their own planets. There are forty planets in total. Some are moons orbiting gas ...
3
votes
1answer
225 views

Can you forge iron from oxide dust?

I've been looking over the internet and on here to find some kind of evidence for this, but nothing conclusive, so I was hoping for people with a better understanding of smelting, chemistry and ...
-3
votes
3answers
225 views

Are atoms present in the vacuum of space?

I'm currently writing this story where an intelligent lifeform, instead of human eye-sight, is able identify the chemical composition of their surroundings, by detecting and "mapping" all the atoms ...
11
votes
9answers
5k views

Can you compress metal and what would be the consequences?

Following my mutant thread, I'd like some insight on one of them. I wrote this first generation highly powerful mutant whose ability revolves around metal. (Context, skippable if you're only here ...
2
votes
8answers
1k views

Ideas for 3rd eye abilities [closed]

I am creating a super villain that developed special abilities from a mutated pineal gland. For now i'm referring to it as the Enhanced 3rd eye or the 3rd Eye ability. From the research I've done, ...
17
votes
6answers
3k views

Doomsday-clock for my fantasy planet

I want the surface of my fantasy planet to be made hostile every few thousand years for long enough to make every species go extinct that breeds on land. The easiest explanation seems to be other ...
2
votes
2answers
697 views

What would be the ramifications if you were to increase the speed of light by at least a factor of 10? [duplicate]

I know that the wave lengths would be shorter but how would this extend habitable zones? Would zones disappear? Would other stars have an effect on Earth? If so, then would that counteract the ability ...
12
votes
12answers
4k views

Is it possible to make sharp wind that can cut stuff from afar?

You know the typical wind slash in anime or games where the swordsman slashes from afar either vertically or horizontally and the wind pressure or projectile cut the opponent, like in this image for ...
4
votes
2answers
142 views

Would direct use of kinetic energy be able to simulate a solid object?

For context, imagine that a human being has reality warping powers based on knowledge. Basically, if you know how something works and what manipulations have to happen for a certain result to occur, ...
5
votes
1answer
126 views

Can spiky arm guards/bracer be an alternative weapon for blunt attack or will wielder get broken bones upon hitting?

Basically what's in the title: If someone uses a spiky arm guard/bracer (long bracelet type armor not gauntlet) while bashing/battering an opponent (with or without armor) would this result in the ...
4
votes
3answers
305 views

Non-causality-violating FTL travel. / Can omnipotence beat causality?

While building my sifi world I dug into ftl-travel and encountered these mean bullies, causality and relativity. They told me I can't have faster than light travel, because effect can't precede cause ...
9
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2answers
161 views

How to blow up water and fly through the wake

I want to achieve the following. Jet + secret base underwater + blow up water with bomb to gain entry to tunnel at bottom of the sea, see image: Say that the depth is 1000m, then Based on calculation ...
4
votes
3answers
504 views

Can mass be shunted off into hyperspace, but the matter remains?

My question is this: can excess mass be bled off into hyperspace (the large and compact extra dimensions, not the Star Wars-esque swirling vortex), yet the matter remains in our universe? Is mass too ...
8
votes
7answers
2k views

Is it logically or scientifically possible to artificially send energy to the body?

Is it possible to use a power plant-like machine to create small amounts of electrical (or other) energy directly inside the human body, making it such that the human has energy for activity without ...
6
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3answers
309 views

Which edge shape is better to cut things with for a chain sword type/style?

To help you get the idea of what I mean, here is an example of the edge. Imagine the edge can move like a chain sword or chain saw, so don't take it too literally. Don't consider the entire sword ...
6
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0answers
267 views

The great battery swap [closed]

An alien contra-organization wants to spur the development of Earth to help humans in the near-future in presence of a prime-directive like law. They cannot establish actual contact, so they do the ...
1
vote
0answers
89 views

How would an “minecraft-like” dimension behave? [closed]

The "dimension" I'm building, consists of earth-like plane that stretches on to infinity. It's a soft sci-fi universe and this dimension is man-made. The land has infinite mass, I don't know what ...