Questions tagged [physics]

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

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6
votes
1answer
665 views

Is this a plausible interstellar propulsion system?

Interstellar travel is hard and complicated, yet I want to have a plausible interstellar propulsion system for my setting. Rockets are out because of the rocket equation and the horrible top speeds ...
0
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5answers
271 views

What improvements in the human body will allow it to withstand critically low or high pressure?

My question: What is it that needs to be improved or added to the human body so that it can withstand critically (fatally) low and high (if, my genetically modified person is underwater or a very ...
3
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2answers
142 views

Could a vehicle levitate through use of ultrasonic sound waves?

This is a bit of a continuation of my previous question, could a form of acoustic levitation be used as artificial gravity? In that question, I referenced how some scientists use acoustic levitation ...
33
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10answers
10k views

How many pillows would you need to survive a fall from a church tower?

The praised Dutch book "Koning van Katoren" features an 18 year old who wants to become king of his country of Katoren, which had been under the regency of half a dozen evil ministers for his whole ...
5
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4answers
222 views

Skysteading: How to build a flying city

I am building a city in the sky; it floats thanks to hot air balloons and hydrogen. The main issue I have is how to make it grow, as this is not some kind of giant structure to start, it is a small(...
0
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2answers
73 views

I heard that water is a medium for heat exchange how would a water manipulator use vapor to control air via temperature?

From the superpower wiki I heard that vapor is a medium for heat exchange, but when I did some research on it I found that heat exchange might need a closed system. In a fictional world how would a ...
2
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3answers
135 views

How to tell it is a relativistic kugelblitz instead of other photonic attack?

Set in a quite distant future, intergalactic war is brewing and it is important to tell what form of attacks the enemy ship is using otherwise the battle will quickly become one sided. Anyway imagine ...
4
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3answers
319 views

How large can a flying insect get and still be able to walk upside down?

Given the perfect environment, denser atmosphere, oxygen rich, maybe lower gravity, how large can a flying insect get and still be able to walk upside down on a surface? This question starts to ...
4
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3answers
1k views

How could a medieval melee weapon slice through ankylosaurus?

Set in the early 14th century A. D. the sudden appearance of dinosaurs wrecked havoc on the world, no one know why but everybody raced to come up with powerful theories except for a particular group ...
4
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1answer
79 views

Densest practical packing of protons vs. neutrons?

For background: I have some sci-fi technology based on sci-fi physics which depends on some fictional forces that interact differently with up quarks vs. down quarks. So, to get certain types of ...
0
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2answers
148 views

Lagrange systems: What is the mass range for a gas giant if I want to place a earth-like planet on L4 and L5

I am wanting to make a 3 world lagrange system around a Sol analog star that includes 1 gas giant and 2 terrestrial worlds with large moons. I want the terrestrial worlds to have a similar gravity to ...
4
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5answers
240 views

Why would a human bomb not be blown apart by rune magic?

I am a homicide detective on the magical police force. Runes are magical symbols fused into objects that imbue those items with magical power. These spells are stored in these runes for long term use ...
2
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2answers
350 views

What would powers based of the strong force look like?

Or, what physical law can X manipulate in order to have control over the strong force. The strong nuclear force is responsible for binding the all matter together and opposes the force exerted by the ...
0
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1answer
86 views

How can a being that can create electric attacks use targeted lightning storm strikes?

I found one question that deals with how to make lightning from clouds strike a target person, Can we make lightning strike a certain person? but I am looking for something that doesn't involve ...
6
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2answers
155 views

Maximum Theoretical Energy Density of Clockwork

So, I'm slowly working on a concept a little like "Victorian Shadowrun", where magic is suddenly introduced to Victorian Society. One of the side effects of this is a metal, let's call it Orichalcum ...
6
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5answers
659 views

Need method to eliminate all life on planet [duplicate]

Space faring advanced species needs to 'disinfect' planets in habitual zones around stars. That's all life. They can wait a few thousand years to come back and seed the planet with a new ecosystem. ...
-3
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1answer
142 views

How would life evolve in a universe with constant atmosphere? [closed]

For a type of multiverse, where physics are the nearly same as ours, but space has a constant atmosphere comparable to our Earth's. How and where would life evolve, if it can? what I mean is that the ...
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0answers
49 views

A place for telekinesis in physics? [duplicate]

I am a writer, and I have attempting my first fiction novel. However, I like to have things figured out in a way that works with the laws of physics in the universe, at least to a certain regard. For ...
5
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2answers
243 views

What would powers based on the weak force look like

In other words, What physical law can X manipulate in order to control the weak force? And as for the abilities, I...don't have the greatest grasp of what someone can do with the weak force as their ...
3
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1answer
93 views

Can a planet's artificial ring always face the sun?

A habitat/space harbor ring encircles an ice giant crossing both poles (polar orbit) and rotating to create artificial gravity. Can the ring also precess in synchronization with the planet's year, so ...
2
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2answers
223 views

do these mountains look to be in realistic locations?

I'm getting into mapmaking, which I enjoy, but some of the specifics of realism still elude me. I know generally how plate tectonics work, but I was hoping to get some help on a specific example. I ...
29
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5answers
8k views

Can two moons have intersecting orbits yet be guaranteed not to collide?

Working on a D&D campaign. As a physics nerd, I'd like the orbital mechanics of the planet, its sun, and its moons, to follow standard Newtonian/Keplerian mechanics. I'm trying to come up with ...
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1answer
124 views

Concerning magic and the replacement of the four traditional elemants with the four fundamental forces [closed]

In a world of magic where spells are not based on fire, water, air, and earth; rather, the electromagnetic force, the gravitational force, the strong nuclear force, and the weak nuclear force—How do ...
0
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1answer
201 views

How big could a planet get before collapsing due to its own gravity? [closed]

I was wondering, how big could a planet get, with gravity staying the same even with the added mass, before collapsing DUE TO its gravity?(without becoming a black hole) Specifically, I have a world ...
5
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5answers
138 views

Super insulated box/room to store extreme heat possible?

Is it possible in 21st century Earth for someone to create a small super insulated box to store heat like an "anti-freezer" such as putting lava inside the box and the box not being hot to the touch ...
2
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4answers
417 views

Cheapest material per ton on earth?

What is the cheapest material per ton that one could purchase on our Earth in the 21st century? This could also include the cheapest material per ton to harvest so dirt may seem like the obvious ...
5
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4answers
424 views

What would powers based on electromagnetism look like?

Or more specifically, What physical law can X manipulate in order to affect the electromagnetic force? For something to base our assumptions off of, lets assume that we can; Fly Cast lightning ...
6
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2answers
218 views

Is there a safe but weird distance from black hole merger?

I wish to create a world such that it can support the following plot point: the world experiences gravitational waves that are directly noticeable to the human population (i.e. they can feel or see ...
-1
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5answers
200 views

Will it possible to transform thermal energy into electrical energy some day?

Thermal energy is everywhere on earth. If it could be transferred into electrical energy it could serve as a great energy source. This idea is violating the laws of thermodynamics. But it's not ...
5
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5answers
523 views

The effect of a 20 kilojoule punch on a person that is wearing a plate armor

I have always been in love of hand to hand combat but I realize the concept of efficiency and why that is not an ideal choice for combat so I decided to write a story in which characters who are ...
4
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3answers
165 views

is there a way to levitating entire body of water in earth and make it stay in the sky?

as the title, is there a way to levitate entire body of water in earth and make it stay in the sky (not cloud and still in liquid form) ? either natural or man made. the water either flowing or ...
1
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4answers
219 views

What would be the dangers of creating matter from nothing

Dear top secret science network, Humanity was visited by visitors from another universe altogether (one which doesn't obey our laws of physics) - the D'jini. A diplomatic convoy of them apperead one ...
0
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1answer
64 views

What would an object made from photon matter look like? [closed]

In this article,two photons have been made as to interact with each other. So assuming we managed to make, lets say, a meter by meter cube out of photon molecules that is stable, how would it: A) ...
4
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5answers
328 views

How do I create a “magic particle” to make magic work with physics?

I'm trying to make a fantasy-esque magic system in which everything works pretty much the same as real life, except there's a sort of "magic particle" that makes magic possible, but with physics. In ...
10
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4answers
203 views

Sun with low emissivity?

I'm creating a D&D campaign which takes place on a Mercury-sized planet, orbiting a Proxima-Centauri style red dwarf. It is tidally locked. I would like it to make physical sense as much as ...
3
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2answers
259 views

What would powers based of Gravity look like? [closed]

In the post What would powers based on the four fundamental forces look like? @rschpdr gave permission to ask the question that is stated, but looking at each force one at a time. And so, this is the ...
4
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3answers
146 views

What planet composition is need to have giant human that make earth human similar in comparison to ant size to them?

as the title say my question is: What planet composition is need to have giant human that make earth human similar in comparison to ant size to them? i know realistically and probably its imposible ...
2
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2answers
174 views

Neodymium magnets as nanoparticles bonded with atmospheric amide to create a magnetic 'air curtain'?

Amide bonds are extremely stable and their half-life for hydrolysis in neutral aqueous solution is estimated to be seven years. Amides bind to metal ions through the carbonyl oxygen. Neodymium ...
2
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2answers
136 views

Gravity powers realism

One of the main characters of my book has gravity magic, and I'm struggling to find out how it would work. From what I've read, gravity is the result of immense mass bending space-time, so I have no ...
6
votes
2answers
139 views

How strong is my hellstone, if about half a mile in diameter pillars of hellstone hold up about a mile of Earth above it?

The pillars are spread out about a mile apart each, and they all come straight from the ground, slowly gets just a smidge smaller in the middle, and then get bigger near the top, reaching a height of ...
4
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3answers
175 views

How can I meaningfully define the energy cost of magical levitation?

In the world I'm building, there is a form of "magic"¹ that effectively amounts to metabolism-powered telekinesis. In particular, there is a maximum power limit of approximately 20 W/kg relative to a ...
0
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2answers
127 views

what would it need to create indestructible bubble?

Not exactly indestructible, at least after flying to certain height it may pop out. I mean something like the bubble is as hard as stone or steel but still elastic and light to float like bubble, and ...
21
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10answers
6k views

A feasible and efficient method of fast global travel?

What would be an efficient method of global travel that can take you from, let's say, London to Hong Kong in about an hour? It would preferably be made quickly, but money is no object. I don't want ...
3
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4answers
224 views

What effects would we see on Earth if the speed of light universally increased? [duplicate]

Traveling faster than light poses all sorts of physics problems, so most hard SF has had to handwave FTL. But if light were faster, then ships could be commensurately faster without violating ...
4
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2answers
121 views

Anatomically(?) correct nanobots [closed]

With my limited knowledge of chemistry, molecular physics, and quantum computing, I'm struggling to reconcile sci-fi/fantasy trope depictions of (seemingly) impossibly small nanobots with actual ...
-3
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2answers
82 views

When antimatter meets matter do the two of them cancel eachother out? [closed]

I’ve designed melee weapons akin to lightsabers for my setting that emit a blade made out of antimatter. The handle itself serves as a mini particle accelerator, and it emits a magnetic field to ...
4
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2answers
156 views

Air Pressure in a Purely Underground Setting

I'm working on a completely flat, underground world, where "world" means "universe" rather than the equivalent of "planet". Here's what I have so far: The world is a flat, apparently infinite (in two ...
0
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2answers
91 views

Collect lightning energy [duplicate]

Lightning is an abundant source of energy.It is clean,huge and renewable.Is there any way to collect the energy from lighting,store it and reuse later?
8
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2answers
269 views

Solving the biggest problem of relativistic interstellar spacecrafts

In FTL-free universes, interstellar travel is often done by vessels capable of continuous acceleration (the drives themselves are often magitech), which can use the effects of relativistic time ...
5
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3answers
209 views

How to protect oneself against strong magnetic fields?

Spacecraft in my Scifi setting use strong magnetic fields for many purposes. Fusion containment, magnetic nozzles, gauss guns, magnetic fields as pusher-plates for nuclear pulsed propulsion and ...

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