Questions tagged [physics]

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

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6
votes
2answers
125 views

Liquid-breathing piloted craft

Let us assume at some time in the near future, medical science perfects a biologically safe liquid air solution. It can fill up the lungs of the adult human subject and they can breathe it potentially ...
3
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4answers
149 views

Feasibility of a black-and-white FTL drive?

I have an idea for a faster-than-light spacecraft that I would like to run by the expert minds in this community for a plausibility check. Basically the interstellar ship itself is of unspecified ...
10
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4answers
128 views

Can I justify pyrokinesis / cryokinesis in a psychic-style magic system?

I've been going back and forth on my modern setting's magic system for a while now, but I've settled on a power-set that's closer to psychic powers than traditional magic, because of a couple of ...
5
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1answer
141 views

Does “kinetic magic” (essentially telekinesis) imply unlimited energy?

In another question, I talked about a form of magic that converts metabolic energy (i.e. the energy produced by biological processes in "animals", which for this purpose includes e.g. yeast) into ...
2
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2answers
122 views

How can I create strong structures with a drone swarm?

Continuing from my previous questions about a swarm of millimetre-sized drones, I want them to be able to interlock or by some method form into strong functioning structures, like a gun or a baseball ...
6
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3answers
148 views

Can I make my drone swarm quieter or Silent?

I have a character that achieves an ability similar to scattering and reforming or elemental swarming by controlling millimetre sized surveillance drones to morph into different shapes or disperse ...
0
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1answer
128 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 éléphants are good swimmers but the same cannot be said to ...
4
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2answers
149 views

Would this drone structure work?

I had an idea for a swarm of tiny drones, the smallest being as small as fairy flies at 0.15mm long, that could form into shapes and structures, even mimic the shapes of living creatures. They would ...
5
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1answer
112 views

Factors that determine the geology of a planet (what factors determine the elemental composition of the planet)

This is my first world and I want to build in a way that is physically possible (if this is possible, otherwise make the necessary changes) for my civilization (which is mostly fleshed out) but I don'...
5
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2answers
128 views

Are Alpha and Beta-Voltaics the solution to the energy storage problem in Scifi?

In Scifi there is often the issue that all the fancy technology like Mechas and Lasguns need a lot of energy. Chemical sources are limited by volumetric and regular power density. Batteries and ...
9
votes
3answers
138 views

Popping “vacuum bubbles” loudness

Stun-wizards specialize in blinding and deafening opponents at a distance. To do so, they can exert their magical power to manifest a spherical region of vacuum by essentially "telekinetically" ...
-1
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1answer
135 views

Is an Earth-to-Moon missile technologically possible?

Given current capabilities, is it possible for a missile launched from the surface of the Earth to impact the surface of the Moon? I would imagine the same "rocket" used send stuff to the ISS could ...
10
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1answer
141 views

Air resistance speed limits on a broomstick

I'm working on a tabletop roleplaying game about witches. I have most of the mechanics of broomsticks worked out, but I'm having trouble deciding on top speeds. Speed limits are not a result of how ...
4
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2answers
222 views

How does one calculate the diameter of a 'space fountain'?

I need to know how wide the diameter of a space fountain's* particle stream is in relation to the mass it's trying to support. It would have to lift its mass at least 40000 kilometers. The vacuum ...
5
votes
5answers
229 views

Most energy efficent attacks in a physics-bound magic system

I'm currently working on devising a magic system in which all the standard laws of physics are upheld (Conservation of mass/energy, thermodynamics/entropy, and more). 'Powering' the Spell: To keep ...
8
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1answer
210 views

What does a global war look like from space?

In the game Mass Effect 3, several planets are invaded by scores upon scores of hostile aliens, who have enough resources to spread their forces over an entire galaxy and still be largely unstoppable. ...
0
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1answer
130 views

Could there be something like the Higgs field which gives particles their energy in a similar way to how the Higgs boson gives particles their mass?

First of all, in no way do I have advanced knowledge of particle physics, quantum mechanics, or any other necessary scientific concept for a full understanding of this question. Secondly, this is ...
6
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1answer
114 views

Would it be possilble to light the dark side of a tidally locked planet using fiber optics from the right side?

Assume planetary-scale cables are easily constructed, and subsequently ignored. I am assuming these cables would run just under the surface of the planet from one side to the other for minimal ...
4
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1answer
107 views

Feasibility of compressing matter to electron degeneracy

So, I have been a bit disappointed with the answers on how to store degenerate matter from my previous thread, and now I'm even wondering whether one can produce it at all, without invoking ...
5
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3answers
131 views

Constructing a doomsday machine by manipulating the Higgs Field?

I've been working on a sci-fi series set about 1000 years in our future. The discovery of an alien threat leads the ruling government to conceive of a doomsday machine, which they hope will be so ...
3
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7answers
1k views

Good explanation for why aliens can't build nuclear engines?

"Aliens used uranium and plutonium to generate energy for thousands of years. However, by the time they got into space exploration, they've used up every last bit of it. That's why they'll have to try ...
6
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1answer
649 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
266 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
137 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
215 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
69 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
129 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
315 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
77 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
145 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
236 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
312 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
81 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
143 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
654 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
140 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 ...
0
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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
votes
2answers
228 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
92 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
votes
2answers
218 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 ...
-4
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1answer
115 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
197 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
votes
5answers
137 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
350 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
votes
4answers
347 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
votes
2answers
207 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
193 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 ...

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