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Questions tagged [physics]

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

14
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4answers
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Would mining huge amounts of resources on the Moon change its orbit?

Imagine that humanity builds mining facilities on the moon. We know that the moon has Helium-3 which could be used as fuel for fusion reactors. Also, there are a lot of other resources which could be ...
7
votes
4answers
457 views

Could a creature like the brethren moons exist in reality?

I recently came across a game called dead space and a certain main antagonist species inside of the game. In this game you play as the main character who is trying to protect humanity from sentient ...
3
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3answers
157 views

How to detect gyroswords

So, in the land of futuristic feudalism, the board of sword duels has a dilemma. During a duel, one of the duelists added put gyroscopes in his sword. He claimed this was to improve his balance, which ...
2
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2answers
127 views

There is some material able to stand a plasma arc welding without damage?

There is something that can stand that much temperatures ? or that kind of Welding can evaporate or melt everything ? I read that nothing could stand more than 7000 ° C, but i want to be sure, also, ...
30
votes
12answers
6k views

Would pyrokinesis be an effective defense?

I've read comics in which someone with pyrokinetic powers was able to block bullets with a sheet of fire. I have three questions How hot would the fire have to be to melt a bullet passing through it? ...
17
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5answers
3k views

Gravity alteration as extermination tool viable?

An alien race was rubbed the wrong way by humans being humans and decided that humankind has to go. However, unlike many other science fiction stories, they do not intend to give the humans even a ...
8
votes
2answers
172 views

What kind of transports would be invented in a world with an enhancer-material?

You have a material that greatly enhances electric and magnetic sources or electro-magnetism in general. In this world, the material, is known to be a naturally occurring liquid found in geological ...
1
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3answers
95 views

Is it possible for the remnants of a planet to be locked in orbit around another in a dual planet system?

I'm envisioning a double-planet system where both orbit around a central point. One planet is approximately Earth-sized, while the other is about one-tenth the size. One of the planets (the smaller ...
4
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1answer
70 views

Increasing potential energy with ability thought experiment

While recently reading a physics textbook and thinking about magic systems, I tried to perform a thought experiment I had problems with concluding, so I thought of asking for help. Here I explain the ...
-6
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1answer
118 views

Punching someone and sending them flying at the speed of sound

Hey I'm just wondering how much force/energy is required to punch Someone so hard that the person is sent flying at the speed of sound Also what can you compare the force/energy too like for example ...
24
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5answers
2k views

Feasibility of anti-matter as a fuel

Now, taking out the cost to produce/collect it, assume somehow we perfected a formula or find a natural source (because that is currently very prohibitive), how feasible would be to use antimatter as ...
6
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3answers
353 views

What ways are there to keep a steady altitude with large fluctuations regarding load?

Setting: In my world I've introduced some science-defying material. I use it to grant the ability of flight to airships that are less Hindenburg-y and more ship-y. They are not literally ships that ...
2
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9answers
371 views

If I travel back in time and do nothing, just being an observer, would that change the past?

This is how time travel in my question works: You go back to a certain point in time, physically, regardless of means. Be it a spaceship or a time machine. So you've reached to the past. You know ...
6
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3answers
308 views

What would it look like in the accretion disk of a feeding supermassive black hole?

I wanted two characters unaffected by the heat and gravity to be close to a super massive black hole within the accretion disk, at times moving in orbit and at times completely still. Stars and ...
3
votes
6answers
218 views

Areas with high energy on an Earthlike world

In an earth-like world, what can I provide as examples of areas where high energy is generated naturally? I'm looking for sources of energy other than heat, for e.g, volcanoes and geothermic vents.
6
votes
7answers
358 views

Death from Space: Taking out an Enemy Fortress by Launching a Destroyed Space Ship at Them

Scene Description in my Book: (You can skip this part if you want, I will put the details below) You are an admiral for "army Red". You have just gained space superiority over the planet you plan to ...
17
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4answers
531 views

Is it possible for a planet to have a liquid ring?

Is it possible for a planet to have a liquid ring rather than a ring made of solid particles? If it is, how long would it be stable for? If not, is there any other configuration of a liquid that ...
1
vote
4answers
254 views

Making fusion reactors better with nanotech [closed]

After finding the energy harvesting page of Wikipedia, one side of the S2 engine was covered This was the "vegetative" side. Now we have the active side, that gets more energy under shorter time, I ...
18
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5answers
4k views

How much light is too much?

A mage has created an amulet of light. It shines light from one side, and the user is capable of controlling the color and intensity of that light. In an effort to avoid abuse, the mage has limited ...
6
votes
2answers
268 views

How hot is my dragon?

Little side project on fantasy story with dragons (or wyverns to be exact, but they're equivalent for the purpose). I have dragons roaming the country side, laying waste and ruin in their wake. As ...
10
votes
2answers
291 views

Bouncing Beads of Blood - Just how cold would it have to be?

My heroine has been stabbed - run through the abdomen by a foot-long dagger - and is bleeding to death. She is currently crawling toward her salvation through a very cold place. She is magically ...
9
votes
7answers
1k views

Removing an item from a weight-sensitive pressure plate without triggering alarm [closed]

A character in one of my stories wants to steal a valuable artifact from a museum. The artifact is on top of a sensitive pressure plate, which is configured to trigger an alarm if the weight changes ...
37
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20answers
9k views

What would be best way to re-melt Mars' mantle and core to revive its magnetosphere

Missing magnetosphere on Mars keeps popping up. Most likely caused by Mars core being cold, mantle not bubbly enough. Mars mantle is dormant, core does not move. What would be good way to get it ...
10
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1answer
224 views

Could the equator of a world be a closed-time like loop?

Most works of fiction have quite imaginative views of time travel. Mighty machines that teleport in time instead of space. Gaping portals in space that take you to another time. Mystical beings with a ...
3
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2answers
111 views

How strong is a centaur's upper half?

I know I won't be able to get a solid answer and I could always just change this detail depending on the setting etc., but in a realistic scenario, I have no idea if they'd be significantly stronger ...
18
votes
2answers
444 views

The mass of an economically feasible non-microscopic traversable wormhole

Background In my hard sci-fi settings, there is an advanced Type II Civilization, that are progressing toward Type III Civilization (yes, I am referring to Kardashev Scale). They are sprawling across ...
2
votes
4answers
1k views

How high and far could a person jump in lower gravity?

Specifically, half of Earth's gravity. Let's assume that all other factors are equal to Earth. At a glance, it seems like the answer might simply be "double", but at the same time it seems as though ...
17
votes
4answers
356 views

Is a coral-based planet possible?

Inspired by this answer and the mention of a hyperbolic plane, I've been imagining a world based on that geometry. The closest real-world example of such a geometry I can come up with is hard coral. ...
4
votes
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? ...
2
votes
2answers
182 views

The Mighty Generation Ship Jupiter

"The planet moves" Inspired by this link in a comment from Gryphon here, I also see the concept in this question. We've colonized the moons of Jupiter adjusted their orbits to our satisfaction (to ...
6
votes
2answers
520 views

How close could a planet get to a super massive black hole before being destroyed

I wanted to create a scene where two god-like characters are talking or fighting on a planet or fragment of planet to which they've teleported that's about to be obliterated by a black hole. The ...
-2
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3answers
110 views

How could a creator develop from pure energy to a conscious all knowing being [closed]

Let's assume the purpose of life is to reproduce to survive and on the quantum level for sub atomic particles to bond for longevity. Could an unknown force of energy throughout the ages of time ...
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 ...
17
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9answers
776 views

Can I have droplets of fluids that aren't… well… droplets?

For a story I am drafting I would like to have droplets of fluid that form another shape than the regular domed droplets we usually see. Is there any other shape such as e.g. a doughnut-shape that ...
3
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3answers
157 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 ...
6
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4answers
1k views

A mass manipulation tech - possible?

Idea I'm interested in exploring the following concept: people have discovered a certain kind of matter, let's call it "Unobtanium" (as it always goes). Unobtanium actually has mass and is comprised ...
11
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3answers
2k views

Superheated wing blast!

So, we know that big creatures will generate lots of heat if they’re active. We also know that wings are very good at venting excess heat. Now for most animals, this heat isn’t exactly spectacular, a ...
8
votes
3answers
322 views

Life on giant planet | Can centrifugal force reduce gravity?

In my world a space civilization is colonizing a massive solid planet. The planet has an extraordinarily fast rotation. The gravity is severe at the poles, making life impossible, but life flourish ...
31
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4answers
5k views

What would happen if magic was constrained by the second law of thermodynamics

This is a followup question to the question Wondering what would happen if magic was constrained by Conservation of Energy and it's related to this post. This question asks which sources of energy ...
8
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5answers
1k views

Absorbing heat from unlikely places

Living in polar climates can be quite difficult, and staying warm can often be such an issue. But not anymore with the heat sponge! This nifty little organ draws heat from even the coldest water to ...
4
votes
3answers
839 views

How many litres of gaseous helium would it take to lift 80 kg on Earth?

I have dragons in mind for my world, but I'm trying to find logic in how would a medium-sized anything fly off and still be a danger to humans. So far, I have a lizard-like cheetah with wings, ...
6
votes
9answers
897 views

Rivers flowing uphill

In this article, scientists are investigating river channels on Earth, Mars, and Titan to see how rivers modify their landscapes. The following quote caught my eye: Rivers are, in a way, topography ...
1
vote
1answer
190 views

Electric muscles

There is a popular belief that the muscles of our body are controlled only by electrical impulses. This is not entirely a lie, but ... From what little I have researched, the nerves send a command for ...
25
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6answers
5k views

What would birds look like if they used buoyancy to fight gravity?

What would birds look like if they did not have to fight gravity to fly? The question comes from the premise put forward by some that gravity is not real and that what holds us down is pressure ...
32
votes
13answers
8k views

Why isn't my superhuman always hungry?

I'm writing a speculative fiction story that includes superhumans. The focus is on individual characters and their daily lives, and I'm trying to maintain some consistency by not throwing all the laws ...
-2
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6answers
225 views

200G to 1G environment

Let's say a human were to live most of his life in a 200 G environment but then suddenly enter a 1 g environment, What would be the effects to his body and will this give him the ability to carry ...
4
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3answers
256 views

Could a more convenient form of energy transfer/storage than electricity be possible?

I was thinking about the progress that has been made in terms of energy usage for e.g. transport purposes and noticed how the prominent source of energy had changed over time: first muscle power, then ...
5
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3answers
469 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
7k views

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 ...
77
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17answers
17k 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 ...