Questions tagged [physics]

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

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7
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1answer
231 views

What would be need to be modified to let a human handle more G forces?

I watched a video or read some article recently on the reality of Attack on Titan's 3D maneuvering gear (very sorry, but I can't find it) and how it would kill the user easily. Basically, even with ...
-1
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1answer
3k views

What would our world be like if e=m*c^3 [closed]

What would our world be like if e=mc3 ? What would happen to physics as a whole and what constants that we have now Change? How would they change? How would stars exist and for how long? How much ...
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3answers
234 views

Shooting mass (people) into a blackhole to keep a spacestation in orbit?

Due to contrived circumstances, A spacestation full of people is orbitting a blackhole. Over time the orbit is slowly deteriorating. They have no fuel to escape. Everything that isn't essential to the ...
4
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6answers
1k views

Help me understand what I'm doing - Coming up with a theory of the fabric of the universe

(in quotes are the probably inaccurate words I use to call my stuff) I'm writing a space opera, in which I want to have "transcendental" alien beings that either live in "higher planes&...
-1
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0answers
74 views

What designs would small humanoids use for melee weapons? [duplicate]

These humanoid creatures would be 10x smaller than humans, and they will look like us, probably a bit more muscular. They would be standing at 15-18cm. Just imagine them being squirrel sized. They are ...
1
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1answer
85 views

Using the densest galactic superclusters motion to see a universal structure or motion

My alien species has their science and observation based on our current understandings and observations, they have an observabe universe of the same distance as ours they have noticed the structure ...
0
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2answers
487 views

Total Disintegration: Aftermath

Suppose some sci-fi doomsday device was able to generate a chain reaction that interrupts gluon interactions in matter. Once triggered, it expands through all matter in range, disintegrating atoms ...
30
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13answers
14k views

Plausible plasma weapons?

In a lot of science fiction, the advanced weaponry takes the form of guns firing directed bursts of plasma. These searing bolts of fire are classic ways to create weapons apparently rooted in science, ...
0
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2answers
94 views

Humans in 83% earth gravity? [closed]

A planet I’m working on has 83% earth gravity. What would this be like for a human visiting the planet?
10
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9answers
2k views

Believable magical transmutation of elements

I want transmutation of elements (for example, changing lead into gold) to be possible in my world, using magic rather than nuclear physics. I want the overall energy input or output to be consistent ...
6
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3answers
249 views

Non-falling world

My goal is make a world where you cannot fall. So in my world (or at least city) you slow down as you fall so you wouldn’t be going fast enough to get hurt when you land. Im thinking the air is like ...
0
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3answers
71 views

What physical conditions should be present on a planet for humanoid bird-creatures to exist? [closed]

I'm writing a fantasy novel with a sentient human-bird species. These creatures magically transform, growing feathers etc. becoming essentially giant birds. What would the general conditions on this ...
4
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1answer
141 views

How much would take and cost to construct a building/tower that reaches space? (with todays technology) [duplicate]

I am aware that there is a concept called "space elevator" that would be a much cheaper and more efficient option of reaching space with a construction (even though we don't have the ...
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3answers
143 views

What are realistic numbers for the engineering/physics for a mag-lev train which would circumnavigate the entire planet earth?

Suppose that you were writing a science-fiction novel (or movie script). In the story, a giant magnetic-levitation (mag-lev) train encircles the entire planet earth. The ring-shaped train track is ...
2
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3answers
106 views

Damage estimate for a large acetylene explosion

In a laboratory in a university building, a gas tap is accidentally opened at the end of the working day. The gas tap is connected to a bank of large acetylene cylinders. The gas tap is ejecting 0....
25
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10answers
5k views

Indestructible silk: good armor?

I've been playing with different conceptualizations and types of armor for historical settings, especially armor with magic enchantments or made from weird materials. I was stuck thinking about ...
0
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0answers
37 views

How would ballistics, rocketry and orbital mechanics work on a ring world? [duplicate]

I'm new here so sorry if my formatting sucks but I was wondering how rocketry and orbital mechanics would work on a ring world? I was thinking my ring world would be 1 AU in radius, 80,150km in length....
0
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1answer
263 views

If King Kong was real, would he be able to climb the Empire State Building or the World Trade Center? [closed]

I heard somewhere that King Kong would be much too large to climb at all. Elephants and hippopotami are extremely poor climbers. I know that elephants are good swimmers but the same cannot be said to ...
19
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2answers
2k views

Is it possible to place a permanent probe on Uranus?

Before anyone points the finger saying this is a tasteless joke, there are some actual good reasons to pick that specific planet for exploration among the giants in our solar system: Smallest mass ...
17
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20answers
5k views

A new way of invading a besieged castle?

Forget those old-fashioned siege ladders. No-one wants boiling oil poured on them as they labour to the top. They need to get there much quicker and with no ladder to be pushed away when they are at ...
5
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11answers
504 views

Why would a civilization only be able to walk counterclockwise around a thing they're looking at?

What would make a civilization only able to walk counterclockwise around an object they're looking at? For example in this culture a sculpture like might only have been viewed in counterclockwise ...
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33answers
5k views

On a tidally locked planet, would time be quantized? [closed]

Assume a planet that always presents one side to the sun. No moons. The orbit of the planet around the star is essentially spherical, very minor and undetectable aberrations. The orbital period of the ...
3
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1answer
102 views

In fictional world with two time dimensions could I still keep laws of thermodynamics as they are in modern physics? [closed]

There was this question about spacetime with two time dimensions here, but I wonder what could that mean particularly for thermodynamics? To be more precise, could such a universe (none of dimensions ...
16
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7answers
7k views

Would an object float in mid air at the center of mass of a planet

I've been wondering, would it be possible to achieve levitation of an object in the center of mass of a planet? I ask this because the gravity is the attraction between bodies and theoretically the ...
6
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4answers
312 views

What would be the effects of changing the composition of air in order to increase its density?

In another question, I asked how airships could be made more viable. The first (and so far only) promising solution I came up with is to increase the density of air. In the real world, air (on Earth) ...
4
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2answers
181 views

What is the minimum size of an habitable planet to have two moons?

For the sake of the question, let's define a moon as a natural satellite at least half the size of our Moon. It needs to be spherical like our Moon, not like Phobos and Deimos on Mars. The imaginary ...
4
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2answers
116 views

Which physical laws or attributes would have to be changed to increase the buoyancy of an airship?

As I came to realize from a previous question of mine, my vacuum airships are apparently not as good as I hoped they would. I still do want to use them more or less how I envisioned them, and I'm ...
7
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3answers
276 views

Protecting Mars with no magnetosphere: Can genetic engineering help?

It is the year something-something, and the Sol system has been colonized. The Sun is surrounded by a growing cloud of habitats, Venus is a veritable garden world, Jupiter is being fed mass from the ...
4
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3answers
118 views

Could one create an artilect capable of perceiving more than three dimensions in a simulation?

Virtual space and beings living in it are a staple of science fiction. Usually, these are either artificial, i.e. artilects, or were once human, i.e. uploaded minds. Fictional examples of such beings ...
14
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6answers
7k views

Could negative kelvin be achieved?

What the title says I guess. I'm looking into ways to make a plausible exotic matter source for a story with an Alcubierre drive and I think recall that I saw that there was a possibility to use ...
11
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8answers
3k views

The physics of flying archers

A kind of soldiers in my world can use certain magical equipment to launch themselves into the air and stay airborne (sort of like gliders. They need to keep moving ahead; they can't hover much). Note ...
3
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2answers
146 views

Could A Dragon Really Survive Given the Right Conditions?

So I have been trying to design a dragon that is somewhat realistic and I wanted to see if it was plausible in the our real world, despite dragons being very unrealistic. I also wanted to know what ...
3
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3answers
195 views

How effective/plausible is vibration sense in the air?

I am developing a fictional species of raptor or raptor-like bird, with incredible senses, for a fantasy setting. One element of their combined sensory picture that I thought of was the use of sensory ...
4
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2answers
166 views

Using fire magic to levitate (hot air balloon style)

A magician has the ability to produce, control, contain and extinguish fire anywhere near his body, as much as necessary and has enchanted himself and any object, for example clothing, on himself to ...
0
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1answer
102 views

Bathroom Mirror vs Eye Lasers

There is this scene where the main good girl is fighting the big bad alone. The big bad fires his eye lasers at the good girl, who uses a bathroom mirror to reflect the rays. The big bad can control ...
2
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3answers
182 views

How small and fast can a bullet go in atmosphere?

In many sci fi universes that don't have handheld energy weapons, they instead use solid projectiles that either go big (Warhammer 40k) or really small (Mass Effect). The former I have a pretty good ...
2
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1answer
71 views

Defining what is possible with magic that manipulates the elements

I'm currently trying to refine my magic system which is able to manipulate the elements using the body's natural energy. As examples: I can create water out of the air by coalescing available ...
5
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2answers
411 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 ...
2
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6answers
212 views

How can I expand the definition and some specifics of pyrokinesis?

I'm writing a sci-fi world where, if you put it in simple words, a small percentage of population can manipulate the matter. I'm not going to dive into specifics, because I'm still working on WHY and ...
1
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1answer
164 views

How much energy would a character need to disassemble and reassemble their matter?

I wanted to have characters that can control energy and matter, so Dr Manhattan came to mind as a great example of a character that does that. Information on him says that he has complete awareness ...
3
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6answers
463 views

Is there any evidence against alternate realities?

In our fantasy series, the topic of Travelling between worlds is a major theme. Is the existence of other worlds actually possible? As a writer, it often feels less like coming up with a story and ...
16
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3answers
5k views

A 1 kilometre wide sphere of U-235 appears in an orbit around our planet. What happens?

Let's suppose that after seeing aliens get portrayed negatively in science fiction and wishing to end the discrimination, the ancient H'andh'wh'a'vians decide to destroy Earth and humanity. As they ...
6
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4answers
428 views

Design for an Extendable Melee Weapon?

Design for an Extendable Melee Weapon? Background I've been working on a RolePlay setting, for me and friends. The setting mostly uses energy weapons, and at the higher levels, anti-energy shields (...
4
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3answers
177 views

Applying this kind of physical magic to walk on air

I have a magic system with very specific physical rules (hence why the question is science-based), but I need help working out a specific scenario. Also feel free to suggest better terminology where ...
19
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15answers
7k views

What would be the most efficient and cost effective way to stop a star's nuclear fusion ('kill it')?

I want a group of freelancers on a spaceship to stop a star from functioning. No government funding and they have to get creative. What would be the cheapest way for them to achieve this? I know we ...
4
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0answers
57 views

What should an inactive planet's topology be for nutrient circulation?

I'm trying to engineer an Earth mass planet built initially out of pure silicon dioxide (silica). So basically, imagine a glass sphere slightly larger than Earth somewhere in the Goldilocks zone, ...
4
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1answer
105 views

Two Worlds tethered together - how would the forces affect people on the planets?

^ Not to scale Assumptions These worlds are engineered. So some aspects of the worlds can be manipulated. Equal Earth-sized planets. Tether attaching them is infinitely strong. Their separation is ...
8
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5answers
826 views

Could an extraterrestrial plant survive inside of a meteor as it enters a planet's atmosphere?

A common theme in media is that an alien lifeform comes to Earth by clinging to a meteor that was once part of the alien's homeworld. Usually, these aliens are either bacteria, viruses, or germs, ...
3
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3answers
135 views

What would the geography a planet with extreme tides look like?

A planet with two orbiting moons (not-tidally locked) and large oceans will have extreme tides. Both moons are about the size of our Moon. I do not know an exact number, but I'm estimating somewhere ...
4
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15answers
1k views

Is there any scientific way a ship could fall off the edge of the world? [closed]

I'm trying to write a story about falling off the edge of he earth during a sea voyage and would like to incorporate as much as detailed and accurate physics as possible. For this to work, I know ...

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