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Questions tagged [physics]

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

11
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4answers
283 views

Wading through high-inertia particulates: how could pre-modern technology best approximate a protective, slick, waterproof suit?

In the supernatural plane of existence known as The Exhibition, time appears frozen - nothing is moving, falling objects are suspended motionless, the works. In addition to this, while outside ...
10
votes
3answers
308 views

Feasibility of floating city-sized forests

My world is essentially a Neptune-sized gas planet that got seeded with life and its surface layer filled with oxygen, therefore gaining a sizeable layer with Earthlike conditions. Within this layer,...
7
votes
5answers
255 views

What required secondary powers does my speedster need in order to be able to accelerate at 2,250 ft/s^2 without harmful effects?

This question was originally posted in the Sandbox. It's set in the same world as this question, but is not related to it. I have a speedster character whose top speed is Mach 2. She holds back a lot ...
5
votes
1answer
221 views

Energy cost of creating body parts from nothing but energy

What amount of energy would you need to expend to create an arm out of nothing but energy? Of course we have $E = m c^2$ telling us the energy any amount of mass represents. Given the average of a ...
10
votes
2answers
2k views

How would a corpse be preserved in outer space conditions?

Suppose you were puttering around the solar system and came across the remains of a luxury passenger vessel, the intergalactic equivalent of the Titanic, adrift about one AU from the sun. The hull was ...
4
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4answers
177 views

Changing Earth's axis suddenly or gradually?

First post, if it isn't completely obvious. I've discovered this site by trying to "google" that question. Here's what I'm investigating: Long ago, pre-deluvian civilizations built ancient megalithic ...
4
votes
4answers
386 views

VERY dense asteroid belt - possible?

I'm making a game which takes place in an asteroid field that is very dense - I'm talking close enough that one is able to jump between asteroids (provided you have some sort of additional thrust ...
0
votes
1answer
106 views

Voodoo via particle entanglement

In a world where science has advanced to the point of a healthy understanding of particle physics, scientists have begun working towards remote matter manipulation. In theory, it seems that one would ...
37
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9answers
11k views

What are the effects of slicing the Earth in half with a particle beam?

Scenario: An exact copy of our world is sliced in half by a particle beam. The beam has a diameter of 40 meters and moves at a speed of 0.999c. The beam slices the earth from top to bottom in 600 ...
13
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5answers
4k views

Would everything be miniature on a miniature Earth?

If there was a planet half the earth’s diameter, for which every other aspect of the earth was changed proportionally to keep the Earth’s perfect ratio intact (including having the perfect orbital ...
-1
votes
4answers
214 views

Would a moon shatter if it collided with an unmovable barrier?

For story purposes, I'm trying to determine what would happen if a small moon-sized object crashed into an unmovable barrier surrounding a planet. My goal here is to eventually get a ring surrounding ...
-2
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2answers
119 views

What happens to an object when it passes through a portal? [closed]

As in the game Portal, if we create two portals on two different surfaces and then join the two surfaces with the portals facing each other, as soon as an object passes through one of them, what would ...
4
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4answers
148 views

Could charged plasma be used as a working fluid to spin a magnetic turbine to generate electricity?

As the title suggests, this is a conceptual physics kinda question. What is the feasibility of using an electrically charged (as in not neutral) plasma as the working fluid in a turbine where the ...
25
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16answers
11k views

What happens when a moving vehicle loses all its kinetic energy at once

In the system of magic that I am using I try to follow the laws of physics as much as possible. The idea being that whatever magic can do, a scientist and machine can eventually do. One of the things ...
2
votes
2answers
190 views

Would a planet with these seasons be possible?

Just as a disclaimer, I have very little knowledge on the science on all of this and have a very poor grasp on what is plausible and what isn't, but I suppose that's why I am here. I have a concept ...
7
votes
2answers
606 views

Siamese Twin Planets?

Premise I want to explore the possibility of a planet that is extremely misshapen. If we were to extrapolate what we have observed from our solar system and the extra-solar planets discovered so far, ...
-4
votes
1answer
249 views

Firing an AK-47 while anchored to the ISS [closed]

The Setup I magnetically anchor myself to the floor of the ISS. (yes I know there's no "floor", any wall will do) Then, I fire a 5-round burst out the airlock. The Question Can the recoil from ...
10
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4answers
2k views

Could a world exist with a distinct line of changing temperatures between the hemispheres?

I'm trying to create a world where there's an equator-like divide running along the axis(?) of the planet and the two hemispheres are perpetually different in terms of temperature. Basically, I want ...
2
votes
2answers
185 views

How much energy would be required to vaporise a giant reptilian monster?

At the climax of my story, the main antagonist transforms into a gigantic and nigh-unkillable monstrosity that resembles an unholy hybrid of a crocodile, Mosasaurus and Dimetrodon. After a long and ...
10
votes
6answers
360 views

Do moons determine the speeds at which tides move? Is there a limit to this speed?

I'm writing a short story that takes place on an imaginary planet that is 88% ocean. The planet has two moons and one continent that is regularly flooded under 500 to 1500 feet of water. The tides are ...
10
votes
3answers
2k views

Could excessive fracking over long periods of time cause tectonic plates to shift significantly?

Trying to create a future earth which has been thoroughly abused by the excesses of modern capitalism. Extreme weather, rising sea levels, massive droughts, that sort of stuff. My question is: ...
1
vote
5answers
183 views

What mechanism could be used to create an eternal night?

My question is how a species, given sufficiently advanced technology - could block out all - or most - visible light to a generally earthlike planet without rendering it uninhabitable. The only ...
6
votes
1answer
396 views

I've determined how many planets my solar system could plausibly have. How do I figure out what kind of planets they are?

The 12 planets in my solar system orbit the G-type star of Nemo. It's about nine-tenths of the size of the sun, and has a stellar luminosity of 0.67 L☉, a diameter of 1.28 million kilometres, a ...
6
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4answers
425 views

Are there size constraints to Time Bubbles?

I'm creating various artificial Time Bubbles in my universe where time flows faster or slower inside a specified area, typically depicted as a semi-transparent bubble. Before developing any more ...
6
votes
4answers
256 views

Would my lizardmen be good at throwing things?

Okay, so I was creating a cold-blooded humanoid species (for a story, I'm no scientist) and ran into a problem with some of my logic. Because of their obvious issues with overheating, these ...
7
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2answers
247 views

Could I put a large city into geostationary orbit?

I want to put a circular city in geostationary orbit. The city will have a radius of 20Km. I was thinking of using quantum trapping/levitation to achieve this. Here's what quantum trapping is: ...
2
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6answers
315 views

Protection against h-bomb core explosion conditions thinkable?

Assume a human in direct vicinity (think 1-50 m [if you need more space for your intended device]) to the explosion center of a nuclear fusion bomb. Is survival via technology thinkable? The TNT ...
18
votes
12answers
5k views

In a spinning Dyson ring, would objects not touching the surface experience gravity?

I have a world inside a Dyson ring with a radius of ~1 AU, complete with humans, animals, plants, clouds, and Earth-like atmosphere. The ring is spinning at a particular angular speed, giving the ...
-3
votes
2answers
184 views

What would happen if an object traveling faster-than-light, with negative mass, crashed into something moving at sub-light speeds? [closed]

The warp drives I have defined for my science fiction setting work by creating a field which gives the ship a net negative mass to allow for faster-than-light travel. What I want to know is how an ...
27
votes
9answers
6k views

Sailing without wind, but with strong currents

Context On my world, there is a lot of water: sea, oceans, ... There are also firm land and islands, so it's interesting to travel on the water. The problem is that there is NO wind at all, and lots ...
7
votes
2answers
152 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
240 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
155 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
168 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
59 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, ...
124
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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
71 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
250 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
687 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 ...
10
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7answers
899 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
227 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
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
votes
5answers
331 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
218 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
255 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
712 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
245 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
218 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, ...