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Questions tagged [physics]

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

5
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453 views

How could you rapidly increase a black hole's mass?

Say you were using a black hole as a propulsion drive á la Crane and Westmoreland http://arxiv.org/pdf/0908.1803.pdf- so your black hole has a radius of around .9 attometers - super tiny - around 600,...
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11answers
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If the SUN of our planet was the same size and proximity of the moon, would it still work as usual?

I'm building the world of my story for my comics and I've come to a bit of a standstill with a particular idea. Assuming there were no other planets in our universe, just a single planet Earth. The ...
2
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2answers
118 views

Mechanism to slow down the light emitted by an object such that it will result in inaccurate position of the object to the observer?

Let's say that there are two people named S and C. They are not far apart; less than 10 meters. Let's also assume the scenario takes place in late evening or in the night, for simplicity. Normally ...
77
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17answers
16k views

Would a 'World Tree' be feasible in real life?

A livescience.com article claims that trees can reach a theoretical height of 400 to 426 feet (122 to 130m). This is due to the tree being unable to carry water up to the top at that certain point due ...
14
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10answers
2k views

Realistic Airships

I'm looking for an answer concerning a steam powered airship. The steam is generated via coal burning. The ship is propelled by an X amount of steam engine propellers (think Besler steam plane). The ...
27
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5answers
5k views

How to detect that the universe got mirrored?

This might be more fit in physicsSE, but since I don't even know if my premise is physically sound, I'll post it here. One day, something caused the universe to get mirrored, meaning a left-right ...
4
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4answers
203 views

How long would it take a matter-antimatter GeV gamma ray laser photon rocket to get to Ross128b (11 light years away)?

I'm writing a colony story, and I want my ship to colonise Ross128b, which is 11 light years away from Earth. I need the characters to be alive when they get there, but it's okay if they've aged ...
4
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3answers
161 views

Would fast decompression take place in a sealed tower on an Everest-sized mountain?

I have a large skyscraper-sized tower built at the summit of the highest peak in my world. At that height, I am aware that people need oxygen masks and other aids to survive for long and reach the ...
6
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6answers
1k views

How might a purely mechanical 'voice' function?

In my world there are mechanical semi-humanoid automata. Would it be possible to make them speak in a fashion that sounds natural (i.e. human)? How might it function? The mechanism should be capable ...
4
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2answers
140 views

How much heat would a 1km asteroid release into earth's atmosphere?

I am writing a theory for a game that is in an apocalypse. An asteroid is heading for earth and will crash into the earth regardless in this theory. It is 1km in size but due to the YORP effect it has ...
3
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3answers
198 views

Mechanical amplification without creating huge distances?

How would a mechanism look that allows a person to e.g. turn a crown-sized wheel (from a watch) by any amount (e.g. 180 degrees) resulting in a turntable (from train yards) turning the same amount (e....
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2answers
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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 ...
9
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6answers
4k views

Are there physical laws making this kind of revival impossible?

AFAIK, inanimate bodies and life forms are in the end a large set of subatomic particles (and atoms, and molecules) and energy. Unless my basic knowledge of Physics fails me, you can return a particle ...
1
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3answers
226 views

What would an earth-sized world be like if shaped like Ultima Thule?

Recently, pictures taken by the New Horizons space probe were released depicting the unusually-shaped object Ultima Thule. Now, suppose there was an world the size of the Earth, but in the shape of ...
4
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2answers
128 views

Equation to get the size of a crater created by a meteor strike?

Im trying to find the equation to the the size of the resulting crater created by meteor strike when I have the mass, volume, diameter, density, velocity and kinetic energy of the meteor Can ...
0
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2answers
128 views

Can E=MC2 be used when thinking about human strength

As we know just because a person has more mass that doesn't mean they can lift more weight or punch harder as those actions are more about training your technique. My story is a martial arts / ...
1
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0answers
70 views

Internal Body Heat of Giant Animals. At which point would their size cook them from inside? [closed]

It is my understanding that one of the reasons for why massive lifeforms (as depicted in fiction) aren't possible is the fact that the heat radiated by their body after a certain point would be too ...
1
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0answers
46 views

Effects of magnetic fields overs biological life [closed]

How would life evolve on a planet or other place with a high magnetic field? (It should be a field strong enough to attract tools and weapons and stick them to the ground.) The life forms that would ...
9
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4answers
2k views

Would it make sense to use destructive wave interference to silence gunfire?

So based on my limited understanding, some luxury cars have taken to using their sound system to make the cabin quieter when on the highway or something (Active noise control via wikipedia). And I ...
6
votes
3answers
198 views

How strong would a person need to be to cut cleanly through steel plate?

The problem is that I would like to know how strong the creature I have in mind will end up being and if that would be too strong. I know that 15th century plate armor was very good against slashing ...
44
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11answers
15k views

What would happen if the Earth struck a tiny but immovable object

We are living on this big lump of rock called the Earth, drifting ever so continuously through space. Now imagine a tiny but immovable object in space, a single atom of 'unexplanium', locked in space-...
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4answers
210 views

Would a moon shatter if it collided with an unmovable barrier?

For story purposes, I'm trying to determine what would happen if a small moon-sized object crashed into an unmovable barrier surrounding a planet. My goal here is to eventually get a ring surrounding ...
4
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2answers
840 views

How to convincingly explain Kaiju

This will be a companion question for How plausible is my monster?. My previous question dealt with a story treatment for a hard science and realistic take on Kaiju/ giant monsters. While that story ...
19
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12answers
2k views

What is the best design for docking onto a rotating space-station?

In the distant future, space-stations use centrifugal force to emulate gravity, effectively being a cylinder (or something similar like a wheel) spinning around a central axis at high speeds. A ...
5
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7answers
1k views

Can this version of the Alderson Drive be used to violate causality?

I'm working on a simulator-type game which I want to be at least internally consistent, and which I'd like to work as close to reality as possible. That being said, it's set in space, which means to ...
9
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6answers
796 views

Are fly wheels a valid means of energy storage for powering a large space station?

This is something that was just offhandedly mentioned in a Sci-Fi book I read once and as I am now writing one myself I thought I might use it. The scenario is that I have a ship approaching a warp ...
3
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0answers
125 views

What would the periodic table look like in 2 dimensions? [closed]

I've read this question What would the periodic table of a 4-Dimensional universe look like?, and I think it answers part of my question about how atomic physics would work, but I'm not sure. Would a ...
11
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9answers
3k views

Feasibility of an endothermic gun

I had the idea of a "void weapon", which would "generate cold" rather than heat on triggering. All the air from the chamber would be sucked out (thus "creating cold") and on firing, it would open the ...
1
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2answers
226 views

Time manipulation based on physics equations

I'm fairly new to the idea of writing.... anything, and I was asked to make a character to insert in a friend's world. I am trying to create a fictional character that has the power of manipulating ...
7
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5answers
304 views

Barring all structural and stability issues, how would building a ringworld around the earth affect it?

I've looked for an answer for this, but the only information I could find dealt with the ring itself. All I want to know is what would change on the Earth if all problems were solved and the ring were ...
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6answers
422 views

Can magnetism be what causes my flat Earth to accelerate?

It has been determined by observation of the stars that the gravity on Flat Earth is due to it accelerating upwards at 1G. This is what holds people and objects to the surface. It has also been ...
22
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12answers
7k views

Imprisoning people in frictionless bowls

The king's mages have made a discovery: they can create perfectly frictionless surfaces using a new spell. The king immediately suggests a use for this spell: Use it on areas of floor, to keep ...
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5answers
158 views

If the earth is not flat, are we walking uphill or downhill? [closed]

If the world isn't flat and a person is walking around it from east to west. Is he walking downhill or uphill ? (This a stupid question on many levels, but I'm looking for intelligent answers.)
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9answers
6k views

You're superstrong but you still weigh the same. What happens when you hit things?

In movies and especially Japanese anime, you can see characters punching through walls, breaking columns by kicking etc. Similar effect is seen in computer games, which is something I'm interested in ...
2
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3answers
150 views

Artificial gravity of spinning sphere

I have a colonized asteroid that is roughly spherical and has been hollowed out. To create artificial gravity I spin the asteroid creating a strip of 1g gravity around the "equator". What would happen ...
1
vote
2answers
130 views

Spaceship Engineering & Infrastructure Challenges: Air Currents

I have a spherical spaceship that is about 2 kilometers in diameter with an outer clear, yet strong shell. This spaceship is largely made up of empty space occupied by air. Aside from this the ...
2
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0answers
58 views

Plausible? Mechanics of Floating Continents/Islands on Gas Giant (with sea) [closed]

Just thought of how a gas giant would have the physics to entertain floating islands/gigantic landmasses + a floating sea of water. Pretty much just wrote down whatever i could think of. Basically, a ...
2
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3answers
196 views

Could a gas giant have two earth sized moons in binary orbit around it

I’m trying to create a system where a gas giant has two moons in binary orbit with each other. I’m trying to get that James Cameron look with the gas giant on the horizon, but also have a equally ...
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1answer
114 views

How to create matter in a solar system [closed]

I looked to see if anything like this was asked, but can’t find. So a star is formed, the sun for instance., and creates a gravitational force on its own. After a billion years a kuiper belt ...
11
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6answers
660 views

Would a flying superhuman leave a contrail behind?

I'm writing a speculative fiction story that includes superhumans, and I'm trying to get some of the specifics nailed down. Several of my superhumans have the typical powers of flight, usually able to ...
11
votes
7answers
4k views

What size EMP device would be necessary to wipe all data in a Google-sized server farm, without major physical damage?

I'm not sure if it's even feasible, but I have a server farm in my book, of a size that puts it on par with Google's. I want to wipe out all the data stored on the hard drives, without destroying the ...
3
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6answers
2k views

What happens if there is no Air Friction [closed]

In my world everything is formed from the following fundamental elements. Air, Water, Fire, Earth, Nature and Mana. I wanted my creations to be able to travel faster than the speed of sound with no ...
5
votes
2answers
594 views

How would a Venusian day/night cycle (one Venus day is ca.117 earth days) affect an otherwise earth-like world? [closed]

Would the world freeze up with two month long nights? Would it burn in the day? How would animal life adapt to such long cycles? Plant life?
2
votes
1answer
56 views

apply forces such that satellite reaches a given point in space

The problem is the following: let's say we have a miniaturized satellite*, X; we know its position, velocity, acceleration, the forces applied at any given moment; we also know its mass, its ...
47
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3answers
20k views

Let’s say a 1 ton (US) sphere of tungsten moving at 99.99% the speed of light hits earth, what happens? As specific as possible

What kind of destruction would it cause? I’m assuming it’d be rather significant, could it shatter a tectonic plate? The crust? How would the oceans fare? Would the planet be able to catch the ...
13
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3answers
2k views

Is it really possible to see across a ringworld? [duplicate]

Almost all illustrations of ringworlds that I've come across tend to show off the shape of the ringworld from the surface. This doesn't seem realistic to me, because the ringworld's radius would ...
8
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6answers
4k views

What would happen to a planet that was electrically charged?

If a planet had such a large imbalance of protons and electrons that it possessed a net negative or positive charge what would happen to it and its solar system? First, could it be stable, or would ...
11
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3answers
391 views

Feasibility of an 'Oxygen Radiation Zone': a non-pressurized natural formation on Mars that provides suitable atmosphere

CONTEXT and INTRODUCTION Humans establish colonies on Mars with slightly more advanced technology than we have today. The Martian colonists lose all contact with Earth. Over centuries, the Martian ...
34
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4answers
5k views

The Heisenberg Uncertainty Ray - A Hyper-Scanning Doomsday Weapon

From what I know about the Heisenberg Uncertainty Principle, one of its consequences is that when you learn a great deal about the position of a particle, you greatly increase the uncertainty of the ...
8
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7answers
6k views

How could I make a portal to parallel universes as scientifically realistic as possible?

[Edit: I'm not looking for 100% realism. I'm looking for an explanation as realistic as possible, possible with just few exceptions to physics.] [Edit 2: In my imagination these worlds are different ...