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Questions tagged [physics]

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

7
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2answers
144 views

A snow sea: How to make water snow light/smooth enough to obtain fluid properties under 1 gravity

A roughly earth-size planet orbits a cool G-class star, but barely within its circumstellar habitable zone ("Goldilocks zone") allowing liquid water. It has a shallow inclination and and lackluster ...
6
votes
2answers
205 views

Weight of Colossal Fantasy Creatures Based on Length and Dimensions

I'm pretty much looking for an easy (or not) formula for calculating the mass and/or weight of fantasy creatures on an Earth-like planet with similar gravity. My world's dragons sometimes reach over 1 ...
0
votes
1answer
143 views

What is the smallest theoretical energy generator possible for generating huge amounts of energy? [closed]

There are the examples of the Dyson sphere or the black hole bomb but those are too big. Is there any other source of energy you could theoretically contain on earth that wouldn't crush it or us down ...
5
votes
4answers
164 views

Using science, how could an animal achieve lift/flight by using pressure?

Say for instance we had a humanoid creature. how would they achieve flight by taking in a gas then expelling it at a greater pressure from a point on their body like the feet, back, or hands?
2
votes
1answer
56 views

Stationary trinary system

I am creating a world in which a civilization has achieved advanced spaceflight and has begone colonizing other planets in their solar system that is similar to ours, but with more planets. However, ...
122
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23answers
24k views

What could people notice about someone who is two times as dense as a regular person?

I've got a group of magical people living mostly incognito in an ancient society. They look and act exactly the same as regular people, but they are really magicians, and a side effect of having those ...
0
votes
1answer
63 views

What mechanism would be needed to contain and inject super-heated plasma into a target?

Two days ago, I proposed a design for dual forearm-mounted super-heated stabbing blades composed of a Titanium-Coltan alloy and capable of reaching 1,000 °C. These arm-blades were intended to act as ...
2
votes
4answers
241 views

Hyperdense Object

If a planet has a core of super-dense material, how might that effect the geological composition of that planet? Specifically: imagine a lunar-sized planet, with earth-like geology and density. If ...
6
votes
6answers
685 views

How Can I Build Ice On an Iceberg With Primitive Tech?

Let's say a group of people live on icebergs. They want to shape them - e.g., let's say they want to add a pier to their iceberg, how do they "grow" the ice. Prefer a primitive answer, but if there ...
9
votes
7answers
860 views

What's a plausible way prove the existence of the “electron” to the doubters? [closed]

So, at many colleges in the North American region, most famously the New Jerusalem University and Chicago Collegium, much old world, pre-apocalyptic information is often taught at schools, including ...
11
votes
9answers
4k views

Could scientists test a theory of everything?

I'm ready to reduce a certain amount of scientific rigor for a good story. In my world, some person invents a theory of everything. Is there a way that scientists would test the theory, to prove that ...
0
votes
5answers
221 views

Souls That Don't Prove That A God Exists? [duplicate]

Assuming that souls exist within the realm of physics, how could they or some similar continuation of consciousness continue to exist after death, especially without the afterlife being awful, in a ...
17
votes
9answers
677 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 a e.g. a doughnut-shape that ...
3
votes
5answers
287 views

Is it possible that invention of quantum gravity to be practically useless?

I'm building a world where my protagonist invents a theory of quantum gravity. Since I don't want the world to be much changed than it is now. Is it possible that the theory wouldn't have any ...
1
vote
8answers
211 views

Would immovable rods have infinite mass? [closed]

Everyone's heard of immovable rods. They're a staple of fantasy tabletop rpgs. But recently, I started thinking as to how one would actually work. Theoretically, it would just be an object able to ...
-4
votes
1answer
250 views

Can you build a suit that acts against gravity? [closed]

For instance, could a person build a suit that went against gravity enough that you could go through a black hole and survive?
44
votes
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-...
3
votes
7answers
683 views

Creating matter from nothing without breaking the laws of thermodynamics [closed]

I am creating a world where the creation of matter through magic is possible. Right now I am leaning toward the creation of a new subatomic particle that can directly convert energy in the form of ...
1
vote
4answers
241 views

Secret Hangar Location Needed for Entropy-sensitive Nano-bots

Premise In this Earth-like world, a multi-billion dollar privately owned aerospace/defense corporation is devising a secret plan to manufacture a fleet of nano-bots. These nano-bot have swarm ...
2
votes
5answers
215 views

How to make my motorcycle rider survive driving into a wall?

Question I am currently trying to create a dramatic introduction for one of my characters, John Smith. The current iteration of the idea has him suddenly colliding with a solid wall on a motorbike, ...
2
votes
5answers
159 views

Chemical element made with alternative particles

In my earlier question, regarding airships, I mentioned fictional gas, as light as hydrogen but non-flammable. Is it possible to make chemical element, with atoms made not from nucleons, but with some ...
15
votes
12answers
4k views

How could an animal run fast using blade-like feet that sink into spongy ground?

In my fictional planet, forests grow not on soil, but on vast spongy mats of fungi. Traditional Earth-like feet would struggle to get grip on the squishy ground, so most megafauna taxa have feet like ...
6
votes
5answers
349 views

Effects of Mana-based magic on Technological Development

In a world I'm creating there is a web of "Mana" across the universe that isn't the same density everywhere creating areas where magic is possible and areas where it isn't. I'm trying to come up with ...
3
votes
3answers
379 views

Could a huge pole that's moved back and forth be a method of FTL communication?

Here's the plan for the proposed system of FTL communication. A huge pole made of the strongest solid in existence (or whatever solid would work best for this scenario, if no solid exists that would ...
1
vote
0answers
99 views

What gravity/atmosphere would be needed to allow chunks of land to float inside a planet's atmosphere like in the Manga “One Piece”? [duplicate]

It's a fantasy setting, and the world is crazy, but has anyone tried to science it? Weather patterns that are unstable only around what are essentially the Equator and the Greenwich, that change ...
1
vote
1answer
239 views

Could this programmable matter approach allow for scientifically plausible shapeshifting?

While I am aware that there have been a lot of posts about how shape-shifting could be possible, but I am asking if this type shape-shifting would work. Okay so fair warning, physics isn't my strong ...
4
votes
6answers
315 views

How much does a moon’s gravity effect the “free-fall acceleration” of an object on the planets surface?

The Planet The Planet I'm speaking of has the same size as earth but is much lighter. That's because the "Upper Mantle" is about 1000 km wider and mostly consist out of organic material. Such a huge ...
2
votes
3answers
242 views

Element Handling Justification: Water manipulation

I am roleplaying in a lore where elemental justification is really poor. However, loving a good and strong background, I would like to explain why my character is / would be able to manipulate ...
44
votes
6answers
9k views

Can I use a trebuchet to launch satellites into space from a lunar colony?

I've got a lunar colony that struggles to obtain resources, so they're looking for ways to launch satellites into orbit without using up a bunch of rocket fuel. One plucky engineer has suggested ...
12
votes
2answers
142 views

Asphyxiating residents of a mountain valley with a portal to the moon

What I want: My world has a large mountain valley region that is about 70 miles in diameter. I would like for there to be a historical event in which a portal to the moon was created in the valley ...
6
votes
6answers
294 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 ...
14
votes
6answers
618 views

Seasons on Infinite Cylinder Planet

An infinitely long cylinder, made of planetary matter with an average radius roughly equivalent to the average distance Earth's equator has to its center, orbits around a parallel, infinitely long ...
1
vote
1answer
215 views

What might happen if someone poured 10^40 liters of water onto the sun? [closed]

For reference, a 10^40 liter sphere has a radius of 10 au.
17
votes
1answer
2k views

Could this bubble float with a person inside? [closed]

Related to this previous question: Could a city be built out of Balloons? You can breathe helium in place of nitrogen to have a 85% helium to 15% oxygen ratio. Could a person be put inside a clear ...
4
votes
1answer
145 views

No time dilation, what would it imply? [closed]

In a universe where space and time are two independent things. Where time is universal. Where time "passes at the same speed" in any point in space, and dilation never occurs, regardless of mass and ...
26
votes
2answers
2k views

How many seconds would it take for my 20,000 ton kaiju to come to a complete stop from 15 or 30 mph?

I have a bipedal kaiju-style monster that walks upright on two legs and weighs 20,000 metric tons. Supposing, of course, that it can carry its own weight, its muscles can support the stress, and the ...
1
vote
6answers
272 views

How could it be possible for an entire region of space to be filled with Earth like planets?

Ok, I get it, me dumb, you smart. Only smart questions allowed. In any case I'm going to leave the question unaltered in case some others might get something out of the answers. Thanks to everyone ...
5
votes
2answers
238 views

How would a tree that can create its own wind work and look like?

I had an idea of a wind tree that can create wind but it is not man-made) in a fantasy world. Then I began to think/wonder of ways it could realistically work without any magic. So thats where I'm ...
4
votes
4answers
374 views

Crossbow that fires ice-bolts? Seeing as Ice Bullets are impractical and don't work, would firing Ice Bolts work instead?

(To specify, it doesn't have to be specifically a crossbow, if you can think of another weapon that can fulfill the same job like a speargun or a harpoon, or even just a regular bow you're welcome to ...
-6
votes
1answer
163 views

We can paint in a piece of paper but why can't we paint in the air? [closed]

People might say that is is because air has no source to absorb the paint but even air has molecules so then, why is it that we can't paint in the air?
6
votes
2answers
241 views

Is there a way to counter high gravity to make it livable for humans?

I was not entirely sure how to word the title question, so allow me to put my question into more detail here: Suppose there was a planet with just the right conditions to allow humans to live there (...
2
votes
3answers
179 views

How might a slow fire energy weapon reliably neutralize its target?

Inspired by this question, so credit to them for the core idea. How might a slow fire energy weapon reliably neutralize its target? Here are some details about the precise design I had in mind: It ...
35
votes
13answers
13k views

Is there a liquid that could protect a human inside it from impact?

I am trying to figure out what kind of liquid, if any, can be used to severely impede or slow human motion without killing or severely damaging their bodies (IE if after being submerged in this liquid ...
1
vote
0answers
64 views

Concerning Brane cosmology [closed]

EDIT: If an actor or object in a higher dimensional space with less mass than say, my car, attached itself to the car through our dimension's membrane, would it be able to move the car or hold it in ...
1
vote
4answers
164 views

Could a spacefaring people preserve the idea that their world is the center of the universe?

Cosmology since Einstein makes it clear that it's not quite right to say one body in space "revolves around" another, right? Einstein wrote: "The two sentences, 'the sun is at rest and the earth moves,...
8
votes
2answers
276 views

What would be the effect of a very very fast sword strike

Let's imagine some very powerful dude with absolutely ridiculous strength/speed/durability. I'm not asking about the credibility of this, let's suppose it's magic. He's got some magical sword as ...
7
votes
3answers
170 views

Effects of a supermassive ship colliding with a planet

The basis of my story revolves around a single survivor escaping a massive colony ship gone critical above the skies of an alien world. After his escape via escape pod, the ship crashes halfway across ...
8
votes
2answers
301 views

Syrup Atmosphere

As you look at the properties of the atmosphere as you scale up or down, things get weirder and weirder. One good example is the fairyfly and its environment. Fairyflies are so small that at their ...
6
votes
2answers
632 views

What is the effect of being sliced by an ultra-thin object? [duplicate]

Can you survive being sliced by an object if it is thin enough? The following properties hold for this object: It is composed of a non-toxic, body-temperature material, equivalent in weight to ...
-6
votes
1answer
97 views

What if a helium-filled ball was thrown towards the earth? [closed]

Suppose some alien hovering 100's of miles above the earth has constructed a big ball/sphere and filled it with helium, and decides to throw that ball towards the earth. Would the air-helium density ...