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Questions tagged [physics]

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

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5answers
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If the earth is not flat, are we walking uphill or downhill? [on hold]

If the world isn't flat and a person is walking around it from east to west. Is he walking downhill or uphill ? (This a stupid question on many levels, but I'm looking for intelligent answers.)
6
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3answers
107 views

Barring all structural and stability issues, how would building a ringworld around the earth affect it?

I've looked for an answer for this, but the only information I could find dealt with the ring itself. All I want to know is what would change on the Earth if all problems were solved and the ring were ...
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3answers
218 views

Can magnetism be what causes my flat Earth to accelerate?

It has been determined by observation of the stars that the gravity on Flat Earth is due to it accelerating upwards at 1G. This is what holds people and objects to the surface. It has also been ...
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12answers
6k views

Imprisoning people in frictionless bowls

The king's mages have made a discovery: they can create perfectly frictionless surfaces using a new spell. The king immediately suggests a use for this spell: Use it on areas of floor, to keep ...
2
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0answers
44 views

Plausible? Mechanics of Floating Continents/Islands on Gas Giant (with sea) [on hold]

Just thought of how a gas giant would have the physics to entertain floating islands/gigantic landmasses + a floating sea of water. Pretty much just wrote down whatever i could think of. Basically, a ...
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0answers
84 views

Time manipulation based on physics equations

I'm fairly new to the idea of writing.... anything, and I was asked to make a character to insert in a friend's world. I am trying to create a fictional character that has the power of manipulating ...
1
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3answers
116 views

Spaceship Engineering & Infrastructure Challenges: Air Currents

I have a spherical spaceship that is about 2 kilometers in diameter with an outer clear, yet strong shell. This spaceship is largely made up of empty space occupied by air. Aside from this the ...
2
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3answers
138 views

Artificial gravity of spinning sphere

I have a colonized asteroid that is roughly spherical and has been hollowed out. To create artificial gravity I spin the asteroid creating a strip of 1g gravity around the "equator". What would happen ...
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1answer
106 views

How to create matter in a solar system [on hold]

I looked to see if anything like this was asked, but can’t find. So a star is formed, the sun for instance., and creates a gravitational force on its own. After a billion years a kuiper belt ...
2
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3answers
182 views

Could a gas giant have two earth sized moons in binary orbit around it

I’m trying to create a system where a gas giant has two moons in binary orbit with each other. I’m trying to get that James Cameron look with the gas giant on the horizon, but also have a equally ...
3
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6answers
2k views

What happens if there is no Air Friction [closed]

In my world everything is formed from the following fundamental elements. Air, Water, Fire, Earth, Nature and Mana. I wanted my creations to be able to travel faster than the speed of sound with no ...
2
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1answer
53 views

apply forces such that satellite reaches a given point in space

The problem is the following: let's say we have a miniaturized satellite*, X; we know its position, velocity, acceleration, the forces applied at any given moment; we also know its mass, its ...
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3answers
2k views

Is it really possible to see across a ringworld? [duplicate]

Almost all illustrations of ringworlds that I've come across tend to show off the shape of the ringworld from the surface. This doesn't seem realistic to me, because the ringworld's radius would ...
3
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1answer
101 views

Equation to get the size of a crater created by a meteor strike?

Im trying to find the equation to the the size of the resulting crater created by meteor strike when I have the mass, volume, diameter, density, velocity and kinetic energy of the meteor Can ...
46
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3answers
19k views

Let’s say a 1 ton (US) sphere of tungsten moving at 99.99% the speed of light hits earth, what happens? As specific as possible

What kind of destruction would it cause? I’m assuming it’d be rather significant, could it shatter a tectonic plate? The crust? How would the oceans fare? Would the planet be able to catch the ...
11
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6answers
2k views

Teleportation - Pressure differences

Warning This question is one of a series about specific use of teleportation. It will concern only about pressure and atmosphere. Here are previous question: Teleportation and speed Context The ...
34
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4answers
5k views

The Heisenberg Uncertainty Ray - A Hyper-Scanning Doomsday Weapon

From what I know about the Heisenberg Uncertainty Principle, one of its consequences is that when you learn a great deal about the position of a particle, you greatly increase the uncertainty of the ...
10
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2answers
541 views

Planetary cave: Gravity inside a non-concentric shell

There are several previous questions concerning concentric shells. I won't reference them here because this is different. I understand that there is no gravitational effect inside a concentric shell*....
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6answers
7k views

Would one atom of antimatter be lethal if annihilated inside the brain?

I am dealing with a dystopian story that tries to come up with some kind of total surveillence or control from higher authorities. The authorities threaten to kill those who disobey them by simply ...
5
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4answers
707 views

Teleportation - Keeping momentum on arrival

Warning This question is the first of a series about specific use of teleportation. It will concern only about momemtum and speed: other subjects will be exposed later. Context The story happens in ...
11
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7answers
4k views

What size EMP device would be necessary to wipe all data in a Google-sized server farm, without major physical damage?

I'm not sure if it's even feasible, but I have a server farm in my book, of a size that puts it on par with Google's. I want to wipe out all the data stored on the hard drives, without destroying the ...
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3answers
125 views

Can a character perform telekinesis with energy manipulation?

I knew that energy is a scalar quantity, so I wonder can a character move and alter direction of an object at distance by giving it kinetic energy? Thanks.
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1answer
158 views

how could a computer in the first dimension perform multiplication? [closed]

If it is possible for a computer in the first dimension to perform a second dimensional operation in the same way a computer in the second dimension can perform a third dimensional operation, then ...
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1answer
113 views

Fully understanding a universe from within that universe. Gödel's second theorem [closed]

Gödel's second theorem asserts that the consistency of a formal theory containing arithmetic cannot be proved by the tools of the relevant theory itself (provided that the theory is in fact consistent)...
2
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2answers
241 views

Dimensions of an O'Neill cylinder with gravity and coriolis force like surface of Earth

What would be the diameter and rotational speed of an O'Neill cylinder on the inside surface of which centrifugal and coriolis forces are equal to "gravity" and coriolis force on the surface of Earth ...
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3answers
213 views

Could a creature like the brethren moons exist in reality?

I recently came across a game called dead space and a certain main antagonist species inside of the game. In this game you play as the main character who is trying to protect humanity from sentient ...
12
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2answers
291 views

How to predict the color of this sky?

How can I predict the color of the sky based on the information provided? Atmospheric composition: | 2% Trace gases | 58% Nitrogen | 26% Oxygen | 11% Argon | 3% Carbon dioxide | Average ...
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0answers
61 views

How much static electricity can balloons generate? [closed]

The question 'Could a city be built out of Balloons?' has an answer mentioning using the static charge generated by the city as a power source. This made me think: how much static electricity is ...
11
votes
6answers
650 views

Would a flying superhuman leave a contrail behind?

I'm writing a speculative fiction story that includes superhumans, and I'm trying to get some of the specifics nailed down. Several of my superhumans have the typical powers of flight, usually able to ...
2
votes
1answer
91 views

If humans die out would ruins of modern civilization be left in 10,000 to 20,000 years [closed]

I'm making a post apocalyptic story that take place 20,000 years in the future. And I want to know if modern civilization ruins would be around after that. stuff like buildings, signs, ...
3
votes
2answers
78 views

How strong is a centaur's upper half?

I know I won't be able to get a solid answer and I could always just change this detail depending on the setting etc., but in a realistic scenario, I have no idea if they'd be significantly stronger ...
4
votes
4answers
212 views

Creating a Matryoshka Shell world: temperature regulation

In a galaxy far far away, during a fit of inspiration for a super massive marvel of technology, the Imperator dedicates an astounding 10% of energy and materials from his civilization's dyson sphere ...
3
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0answers
88 views

How much longer would it take to reach technological parity without access to energy dense resources like fossil fuels to bootstrap development? [closed]

If the only difference in our hypothetical world is where fossil fuels like coal and crude oil are nonexistent, the advent of an analogous Renaissance Era, subsequent Age of Enlightenment, and ...
3
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3answers
186 views

Landing Pad Using Lenz's Law

In my universe technology is advanced enough to have non-jet and non-rocket booster technology. For a disc shaped UFO all of the technology is crammed in the ship and there was no more room left for ...
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2answers
103 views

Atmosphere density and visibility range [duplicate]

How far can you see through an atmosphere like the one we have on Earth? The protagonist inhabits a huge world, like the inside of a sphere, a Dyson-sphere, with an approximate circumference defined ...
4
votes
4answers
276 views

What requires more destructive energy? Destroying a planet or splitting a planet in half

I just wanna ask which option requires more destructive energy? Option 1 : destroying a planet like earth to rubble (tiny pieces of rocks) Or Option 2: splitting a planet like earth in halves (2 ...
6
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2answers
170 views

How would lower gravity influence Bronze Age projectile weaponry?

How would lower gravity, let’s say around ½ of Earth’s, change the efficacy of different Bronze Age projectile weapons? How would the effective range, accuracy, and penetrating power of bows, javelins,...
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12answers
8k views

Why isn't my superhuman always hungry?

I'm writing a speculative fiction story that includes superhumans. The focus is on individual characters and their daily lives, and I'm trying to maintain some consistency by not throwing all the laws ...
8
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2answers
1k views

Climbing up on running water

I remember playing this game back in 2010-2011, and In minecraft if you found a waterfall you could actually swim it up vertically, it was difficult but possible. Does this apply to real life to, ...
9
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3answers
193 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
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3answers
206 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 ...
7
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2answers
127 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
votes
1answer
111 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
102 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 ...
60
votes
10answers
15k 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
265 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 ...
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2answers
717 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 ...
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3answers
64 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
689 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, ...
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2answers
76 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 ...