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Questions tagged [physics]

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

5
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3answers
85 views

Safely exiting zero-tau capsule

Setting is 20 minutes into future - everything is as we know it, or as we can reasonably predict, except the zero-tau capsules. Capsule is a thin mesh of Unobtanium connected to a portable Handwavium ...
0
votes
4answers
130 views

Energy beam pierces 200m thick steel wall. What happens next?

With a powered-by-phlebotinum (ergo very handy, very powerful) rifle, I am able to shoot high-energy beams which, in turn, can pulverize anything in their path in a considerable radius. The beams can ...
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1answer
71 views

what exactly i̇s the gravi̇tati̇onal force? [on hold]

As I read in other web pages, gravitational force is the attraction force of 2 objects. But when I think about it, it seems like it is the force actiong upon us, like pushing us. On the other hand we ...
7
votes
2answers
90 views

Could the TRAPPIST-1 planets have moons?

The TRAPPIST-1 planets are all very close to each other and thus are subjected to strong gravitational forces amongst each other and to the red dwarf they're orbiting. Would it be possible for them to ...
5
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1answer
87 views

How does the n-body-problem affect a star system around a red dwarf?

So my story is set in the TRAPPIST-1-system and a rogue planet enters the system. When it's still far off, a scientist discovers that one of the numbers is slightly off. (She has some tables that ...
4
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2answers
80 views

Would bio-kinetic metabolism allow the user to also absorb kinetic energy too?

I am trying to base a superpower around bio-kinetic metabolism where the user can not only generate a massive amount of kinetic energy but can also absorb a massive amount of kinetic energy. Is there ...
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0answers
80 views

Superposition as an ability? [closed]

my question is: can superposition be used as an ability? If yes, then how? if no, why? I have magic systems already set, but I think that having superposition as an ability of some sort... would be ...
60
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10answers
14k views

If reality were frame-rate based, how could we detect it?

Inspired by this question regarding reality as simulation and this question about a continuous time line, it made me wonder: if our time were indeed like a high frame-rate simulation, how could we ...
5
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2answers
252 views

How much mass does an object in low earth orbit need to create visible gravitational effects on the surface?

The question stems from watching a scene from ID2 and seeing the massive alien mothership landing/crashing on the North Atlantic. What mass would a starship, or any other artificial object ...
11
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2answers
694 views

“Magic” diamonds for fuel?

The subterranean nation of Glot has developed the ability to “thermally link” two equally sized diamonds, such that they are always the same temperature, regardless of spatial separation. We can ...
2
votes
3answers
55 views

Weather and climate of tidally locked, inhabited moon with oceans

This follows another question that brought me some curiousity about the general state of an earth-like moon tidally locked to a gas giant planet. There's been questions about a world tidally locked ...
5
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3answers
667 views

Would a water-bearing, Earth-sized moon orbiting a gas giant have tides?

I ran across this article today about how moons might have moons. In Daniel Keys Moran's universe, an Earth-sized planet named November orbits a gas giant named Prometheus. November is inhabited, ...
4
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2answers
69 views

What are some plausible formation explanations of a non-hot “Fluffy” Gas Giant planet?

So, in my research and preparation for the question I asked immediately before this one, I was introduced to the concept of "fluffy" gas giants, gas giants with significantly lower density than would ...
9
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5answers
151 views

Mechanism for high geographical change but not killing everything

Premise: Earth has a magical cataclysm that pulls up new mountains, pushes down parts of landmasses, and generally reshapes Europe enough to make it unrecognizable (to the average person looking at a ...
5
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7answers
2k views

Travelling the multiverse by accident? [closed]

As you've probably guessed, I have no idea how multiverses and parallel universes, or space-time travel, etc work. I don't know how Physics or Mathematics explains alternate universes. But, they are ...
12
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2answers
911 views

Would a javelin fly further in a vacuum?

My current WIP involves an athletics competition on a non-terraformed moon, namely the Earth's moon. And while it would be a bit difficult to play certain sports without a breathable atmosphere, the ...
-2
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2answers
102 views

A balloon that can float to space [closed]

I’ve heard there are materials that can withstand the image sort of the earth’s atmosphere, such as carbon nanotubes and Kevlar. Supposedly, a perfectly constructed bridge of such material could be ...
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1answer
67 views

Communication between people [closed]

Suppose there is a man standing on a platform and a man inside a train. They started talking with each other. We know speed of sound-340m/s, so when the train starts moving will the speed of reception ...
4
votes
3answers
137 views

Determining the energy efficiency of a Light Wand

So, I'm working out some of the types of wands people can purchase in my flintlock fantasy setting, and I'm having an issue with one of them. Before I get to that, let me explain how Magic in my ...
5
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6answers
706 views

Geoengineering for dummies

My human civilization is facing (much like us) the threat of anthropogenic climate change. For whatever reasons, they are unwilling to take action by reducing the use of fossil fuels and refuse to use ...
20
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1answer
1k views

Could a planet's Karman line hypothetically occur under a liquid surface?

The Karman Line is one of the most commonly-used definitions of the "edge of space". As an airplane flies higher in the atmosphere, the air gets thinner and thus the lift decreases. This can be ...
13
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12answers
3k views

Aliens to play a mischievous space-time practical joke on Earth

Premise Suppose an earth-like world in the near-future. Then aliens come and decide to play a mischievous trick on this world on an epic scale. The goal is to disrupt Earth's time by 18 minutes. ...
3
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3answers
316 views

Can Mercury's orbit be explained without relativity?

The orbit of mercury is different than rest of the planets. The reason for this seemed unaccounted for in Newtonian physics, and was later explained by Einstein's theory of relativity. Here is a ...
1
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1answer
133 views

How do I create the largest possible space habitat for humans? [closed]

So I'm making a post-FTL world in which humans are the first, and so far only, species to explore the stars. It's thousands (if not millions) of years in the future, and we've become post scarcity. ...
2
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3answers
117 views

How would a species in one dimension with its own properties go to another dimension with slightly different properties?

In my world, I have three dimensions, each of which have their own special properties. From each of these three dimensions come a master race of said dimension: From the first, the master race is a ...
35
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15answers
14k views

Could a really fast man catch a bullet?

Let's say that a character moves much faster (>100 x) than a bullet. If he is shot at, could he theoretically catch the bullet (and put it in his pocket) ? What happens when he touches the bullet, ...
6
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6answers
159 views

How much force do I need to create a fusion explosion or plasma with telekinesis?

Suppose a person, standing at sea level, could use telekinesis to exert a force around a sphere with a 10 cm diameter so that it becomes one-way permeable to air. As time goes on, the sphere becomes ...
5
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2answers
356 views

Using Microscopic Dimensions to Hide Objects

Idea prompted by Brian Greene's The Elegant Universe: String theory postulates microscopic dimensions in space. Could you conceal an object by rotating it into one of the microscopic dimensions and ...
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3answers
148 views

Pirates, IN THE SKY? [duplicate]

Alright so the basics here are pretty simple. I want to have pirates, but in the sky, pretty much what you expected from the title there. BUT, and it is a big one, there is this little problem I keep ...
4
votes
1answer
94 views

What else changes with magnetic matter?

Consider a universe in which leptons & quarks (every fundamental particle that possesses electric charge) all have twins with magnetic monopole charge instead, resulting in two parallel kinds of ...
7
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2answers
149 views

Is the concept of my flying carpet possible?

My planet is tidally locked to its sun. It has a slightly thicker atmosphere than Earth. Over the planet’s sun-side surface, there would be no wind because that area is in the middle of a big cyclone/...
0
votes
1answer
67 views

What circumference would a no season temperate climate planet have

Imagine a planet, 3/4 water and 1/4 landmass. No axis tilt so the climate is moderate throughout the year. IE peak temperatures at 100°F at equator. It orbits a sun about the size of ours and has a ...
3
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7answers
2k views

Is it hypothetically possible to create a giant levee that is a non-physical forcefield or electronic membrane?

What examples are there in science fiction of molecular shields that can cancel out or "eat" certain molecules--and are they plausible? Is it hypothetically possible to create a giant levee that is a ...
1
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0answers
70 views

Physical Force Generation- Applications, weaknesses, and the science behind it [closed]

I've been developing this anti-hero, "Vicious," for a few weeks now- but I need some help concerning the specifics. Vicious has an ability known as "physical force generation." From any point on her ...
2
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4answers
219 views

Localized manipulation of the speed of light

I've recently read Alastair Reynolds' sci-fi best seller, Redemption Ark, where he explored the concept of manipulating an inertial frame overlaid on the quantum vacuum like many of the other ...
5
votes
4answers
191 views

Inhaling vastly more air than one's lung volume

For characters with Superman-style "super breath", the amount of air being forcefully exhaled is often vastly greater than is possible to hold in human-sized lungs. However, this poses two major ...
13
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10answers
3k views

How small can the universe be while still appearing infinite?

I'm working on a concept of universe creation. The best way to describe it in a sentence is the Judeo-Christian Creation Story but from God's point of view. My question is, staying as close to hard-...
21
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9answers
4k views

Indestructible silk: good armor?

I've been playing with different conceptualizations and types of armor for historical settings, especially armor with magic enchantments or made from weird materials. I was stuck thinking about ...
96
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10answers
9k views

Would planets be cubic in my “cuboverse”?

Summary The main idea behind the "cuboverse" is that spacetime distances are measured by (something close to) the sup norm or infinity norm. Under this norm, spheres (the set of points at a fixed ...
4
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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? ...
5
votes
6answers
223 views

Looking for a way to power a locomotive in a pseudo-1600s fantasy world

Assuming a world where there were no steam engines available, would it be possible for large passenger or cargo trains to exist? Would it be possible to use horse-engines to power a locomotive? If ...
7
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4answers
1k views

Would an explosion or energy discharge permeate to other spatial dimensions?

Let's assume there are more than 3 spatial dimension, for example 4 (the 4th not beeing time, but spatial) Would a common energy discharge, explosion etc. affect the 4th dimension? I am not sure if ...
1
vote
2answers
89 views

How would super heroes operate, save lives and minimize damage to property without breaking the laws of physics? [closed]

I lack the knowledge of basic or advanced physics to say that I know what I am asking, but there is a story that I am working on where I want to try to make super powers follow the laws of physics as ...
9
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2answers
221 views

How many dead bodies are required to stain a river red?

Historical accounts of battles sometimes talk of rivers running red with the blood of fallen combatants. Many Lancastrians were killed while fleeing; some trampled each other and others drowned in ...
5
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2answers
205 views

How could a medieval society catch a large number of birds in a short length of time?

I was lounging about in my throne room when a man came to speak to me. He had one leg cut off (recently, too) and claimed he was an alchemist. He says that he wants to get revenge on the king of the ...
12
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3answers
1k views

How fast would a Martian space elevator travel?

READ EDITS I am writing a passage about the main character of my book travelling up a space elevator to the spaceport that rests in geostationary orbit above Mars. This means that the elevator would ...
5
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4answers
109 views

Applications of Electromagnetism in “Force Fields”

Lengthy Explanation of Why I'm Here: TLDR; "force field" made of electromagnetic radiation. Recently, I've decided to compile a list of possible technologies available in the 22nd and 23rd centuries,...
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3answers
144 views

Making a 180 degree turn around a star

For a book under construction, I need a starship to make a 180 degree turn rather quickly. Give him sub-light speed in a star system (no relativistic effects) and on a path to the system primary. I ...
0
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2answers
76 views

Storing 200TJ of Electricity for rapid discharge

Here's the problem I'm having. I need a solution for the following situation. I have a sci-fi starship drive that needs 140TJ of energy every 6 hours. I have a Fusion Reactor that can produce 200TJ ...