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Questions tagged [physics]

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

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7answers
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Travelling the multiverse by accident? [closed]

As you've probably guessed, I have no idea how multiverses and parallel universes, or space-time travel, etc work. I don't know how Physics or Mathematics explains alternate universes. But, they are ...
12
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2answers
922 views

Would a javelin fly further in a vacuum?

My current WIP involves an athletics competition on a non-terraformed moon, namely the Earth's moon. And while it would be a bit difficult to play certain sports without a breathable atmosphere, the ...
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2answers
115 views

A balloon that can float to space [closed]

I’ve heard there are materials that can withstand the image sort of the earth’s atmosphere, such as carbon nanotubes and Kevlar. Supposedly, a perfectly constructed bridge of such material could be ...
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1answer
73 views

Communication between people [closed]

Suppose there is a man standing on a platform and a man inside a train. They started talking with each other. We know speed of sound-340m/s, so when the train starts moving will the speed of reception ...
5
votes
3answers
158 views

Determining the energy efficiency of a Light Wand

So, I'm working out some of the types of wands people can purchase in my flintlock fantasy setting, and I'm having an issue with one of them. Before I get to that, let me explain how Magic in my ...
5
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6answers
722 views

Geoengineering for dummies

My human civilization is facing (much like us) the threat of anthropogenic climate change. For whatever reasons, they are unwilling to take action by reducing the use of fossil fuels and refuse to use ...
20
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1answer
1k views

Could a planet's Karman line hypothetically occur under a liquid surface?

The Karman Line is one of the most commonly-used definitions of the "edge of space". As an airplane flies higher in the atmosphere, the air gets thinner and thus the lift decreases. This can be ...
13
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12answers
3k views

Aliens to play a mischievous space-time practical joke on Earth

Premise Suppose an earth-like world in the near-future. Then aliens come and decide to play a mischievous trick on this world on an epic scale. The goal is to disrupt Earth's time by 18 minutes. ...
3
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3answers
327 views

Can Mercury's orbit be explained without relativity?

The orbit of mercury is different than rest of the planets. The reason for this seemed unaccounted for in Newtonian physics, and was later explained by Einstein's theory of relativity. Here is a ...
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1answer
165 views

How do I create the largest possible space habitat for humans? [closed]

So I'm making a post-FTL world in which humans are the first, and so far only, species to explore the stars. It's thousands (if not millions) of years in the future, and we've become post scarcity. ...
2
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3answers
141 views

How would a species in one dimension with its own properties go to another dimension with slightly different properties?

In my world, I have three dimensions, each of which have their own special properties. From each of these three dimensions come a master race of said dimension: From the first, the master race is a ...
36
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15answers
14k views

Could a really fast man catch a bullet?

Let's say that a character moves much faster (>100 x) than a bullet. If he is shot at, could he theoretically catch the bullet (and put it in his pocket) ? What happens when he touches the bullet, ...
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6answers
180 views

How much force do I need to create a fusion explosion or plasma with telekinesis?

Suppose a person, standing at sea level, could use telekinesis to exert a force around a sphere with a 10 cm diameter so that it becomes one-way permeable to air. As time goes on, the sphere becomes ...
5
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1answer
383 views

Using Microscopic Dimensions to Hide Objects

Idea prompted by Brian Greene's The Elegant Universe: String theory postulates microscopic dimensions in space. Could you conceal an object by rotating it into one of the microscopic dimensions and ...
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3answers
165 views

Pirates, IN THE SKY? [duplicate]

Alright so the basics here are pretty simple. I want to have pirates, but in the sky, pretty much what you expected from the title there. BUT, and it is a big one, there is this little problem I keep ...
4
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1answer
109 views

What else changes with magnetic matter?

Consider a universe in which leptons & quarks (every fundamental particle that possesses electric charge) all have twins with magnetic monopole charge instead, resulting in two parallel kinds of ...
7
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2answers
167 views

Is the concept of my flying carpet possible?

My planet is tidally locked to its sun. It has a slightly thicker atmosphere than Earth. Over the planet’s sun-side surface, there would be no wind because that area is in the middle of a big cyclone/...
0
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1answer
77 views

What circumference would a no season temperate climate planet have

Imagine a planet, 3/4 water and 1/4 landmass. No axis tilt so the climate is moderate throughout the year. IE peak temperatures at 100°F at equator. It orbits a sun about the size of ours and has a ...
3
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7answers
2k views

Is it hypothetically possible to create a giant levee that is a non-physical forcefield or electronic membrane?

What examples are there in science fiction of molecular shields that can cancel out or "eat" certain molecules--and are they plausible? Is it hypothetically possible to create a giant levee that is a ...
1
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0answers
87 views

Physical Force Generation- Applications, weaknesses, and the science behind it [closed]

I've been developing this anti-hero, "Vicious," for a few weeks now- but I need some help concerning the specifics. Vicious has an ability known as "physical force generation." From any point on her ...
2
votes
4answers
299 views

Localized manipulation of the speed of light

I've recently read Alastair Reynolds' sci-fi best seller, Redemption Ark, where he explored the concept of manipulating an inertial frame overlaid on the quantum vacuum like many of the other ...
5
votes
4answers
221 views

Inhaling vastly more air than one's lung volume

For characters with Superman-style "super breath", the amount of air being forcefully exhaled is often vastly greater than is possible to hold in human-sized lungs. However, this poses two major ...
13
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10answers
3k views

How small can the universe be while still appearing infinite?

I'm working on a concept of universe creation. The best way to describe it in a sentence is the Judeo-Christian Creation Story but from God's point of view. My question is, staying as close to hard-...
22
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9answers
4k 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 ...
98
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10answers
9k views

Would planets be cubic in my “cuboverse”?

Summary The main idea behind the "cuboverse" is that spacetime distances are measured by (something close to) the sup norm or infinity norm. Under this norm, spheres (the set of points at a fixed ...
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15answers
2k views

Why would time travel affect the body in any major way, especially damaging? [closed]

Obviously, I'm talking about sci-fi time-travel and not just being as time moves by, slowly but surely. Is there a reason one would actually bleed from any orifice? For any pain to occur? Dizziness? ...
5
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6answers
270 views

Looking for a way to power a locomotive in a pseudo-1600s fantasy world

Assuming a world where there were no steam engines available, would it be possible for large passenger or cargo trains to exist? Would it be possible to use horse-engines to power a locomotive? If ...
7
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4answers
1k views

Would an explosion or energy discharge permeate to other spatial dimensions?

Let's assume there are more than 3 spatial dimension, for example 4 (the 4th not beeing time, but spatial) Would a common energy discharge, explosion etc. affect the 4th dimension? I am not sure if ...
1
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2answers
113 views

How would super heroes operate, save lives and minimize damage to property without breaking the laws of physics? [closed]

I lack the knowledge of basic or advanced physics to say that I know what I am asking, but there is a story that I am working on where I want to try to make super powers follow the laws of physics as ...
9
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2answers
242 views

How many dead bodies are required to stain a river red?

Historical accounts of battles sometimes talk of rivers running red with the blood of fallen combatants. Many Lancastrians were killed while fleeing; some trampled each other and others drowned in ...
5
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2answers
215 views

How could a medieval society catch a large number of birds in a short length of time?

I was lounging about in my throne room when a man came to speak to me. He had one leg cut off (recently, too) and claimed he was an alchemist. He says that he wants to get revenge on the king of the ...
13
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5answers
1k views

How fast would a Martian space elevator travel?

READ EDITS I am writing a passage about the main character of my book travelling up a space elevator to the spaceport that rests in geostationary orbit above Mars. This means that the elevator would ...
5
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4answers
146 views

Applications of Electromagnetism in “Force Fields”

Lengthy Explanation of Why I'm Here: TLDR; "force field" made of electromagnetic radiation. Recently, I've decided to compile a list of possible technologies available in the 22nd and 23rd centuries,...
2
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3answers
154 views

Making a 180 degree turn around a star

For a book under construction, I need a starship to make a 180 degree turn rather quickly. Give him sub-light speed in a star system (no relativistic effects) and on a path to the system primary. I ...
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2answers
83 views

Storing 200TJ of Electricity for rapid discharge

Here's the problem I'm having. I need a solution for the following situation. I have a sci-fi starship drive that needs 140TJ of energy every 6 hours. I have a Fusion Reactor that can produce 200TJ ...
1
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1answer
72 views

Controlling Physical States By Changing Molecule Density

I'm developing a world where certain people have affinity to modify/control certain aspects of the material plane. In the early stages I'd included the good old "element control" premise, but as I ...
3
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2answers
98 views

Batteries and resource restrictions

I've prefigured a specific setting as being middling in technological progress when compared with its neighbors. This setting does not have access to hydrocarbons, has severe cultural and political ...
1
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3answers
181 views

How big does a moon have to be to have the earth locked to it?

I would like a earth-moon system like Pluto-Charon (but with earth instead of Pluto) where both will be tidally locked to each other within something like 3 billion years (before complex life appears)....
7
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4answers
278 views

The plausibility of tungsten reinforced steel Composite Metal Foam (CMF) as body armor

Hi everyone I would like to ask if this material is suitable to be used as body armor like kevlar, as I am planning to use them as armor for my novel. What are the drawbacks to this? Could the armor ...
9
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5answers
265 views

How would it be possible to fly with Talaria (winged sandals)?

The talaria is the name of the winged sandals or shoes famously worn by Hermes in Greek Mythology. If someone were to make a high tech gadget which the attached beating wings to a pair of boots, how ...
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1answer
155 views

Building a planet with a primordial black hole core

I have been trying to figure out a way of explaining how an advanced society some time in the past built an artificial planet with a black hole at its core and the effects that would have on the ...
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4answers
2k views

Simulating gravity in a gravity-less universe

In my fantasy universe, there is a disc-shaped world that has a flat surface that has roughly the same atmosphere as Earth (see this); the atmosphere moves along with the world. There is no gravity in ...
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3answers
211 views

Full body bullet resistant armour

The "people" wearing this are 10 times stronger than humans and have near unlimited muscular endurance so weight is of little (but not no) concern. Their ballistic and gun technology is as advanced ...
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2answers
199 views

Would the Earth with 4 moons still be habitable?

I'm currently writing about an Earth sized planet that is 33% water and has 4 moons all the same size as our moon. All moons are 243,000 miles from the planet's surface and the planet takes 392 days ...
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2answers
149 views

How to travel through tubes? [closed]

We are in new new York, year 3000-ish. The city is quite big but there is a new transport system. Tubes, they are everywhere. They suck you in and out: you fly in them, basically. Those tubes can be ...
1
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4answers
330 views

How tall do atmosphere retaining walls on rotating space habitats need to be?

A common, matter-efficient science-fiction habitat is a hollow cylinder or ring in space that is spun to simulate the pull of gravity on its interior surface. These habitats have been imagined as ...
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3answers
194 views

Life and technology in magnetically-floating islands [closed]

I'm designing a world that has a series of layered floating islands, that are kept aloft due to magnetism. What sort of secondary effects might occur with a planetary magnetic field strong enough to ...
49
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27answers
13k views

If a large space ship crashes on a planet, what could kill passengers without obliterating the ship?

The situation I'm considering is as follows: A large research vessel with a crew of about 100-200 attempts to land on a potentially habitable planet, but something goes wrong during the descent. A ...
2
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5answers
478 views

How to integrate magic with nature, avoid the “our world with magic tacked on” problem? [closed]

tl;dr The typical fantasy setting is just Earth with "magic" tacked on to let the wizards cheat nature. There is absolutely no attempt to integrate magic with nature. Trees, lightning, birds and so ...
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1answer
117 views

Possibility of a dyson sphere-esque structure with earth physics? [duplicate]

I have an idea for a DS-like world setting mostly set after the year 4200. The Earth was destroyed around 2500 and humanity moved from earth to an asteroid best and built a giant dyson sphere to live ...