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Q&A

Posts tagged physics

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Q&A Hot and Cold Reversed - Where should the line be drawn to prevent making the Earth uninhabitable?

In our universe, the energy of the sun generates heat and light. This helps keep the earth warm enough for life and drives much of the earth's climate. Warmth slowly bleeds off into the coldness of...

2 answers  ·  posted 8y ago by DoubleDouble‭  ·  last activity 8y ago by DoubleDouble‭

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Q&A Could a universe with a reverse of the uncertainty principle be self consistent?

In a parallel universe the uncertainty in position and the uncertainty in momentum are directly related to each other. What kinds of effects would this have on the quantum mechanics of this univer...

2 answers  ·  posted 8y ago by Anders Gustafson‭  ·  last activity 8y ago by Anders Gustafson‭

Question physics quantum
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Q&A Could a universe with something like special relativity based on position instead of velocity be logically consistent?

In a parallel universe if two objects occupy different positions in space then in the reference frame of each object the other has length contraction and time dilation. If the two objects are very...

1 answer  ·  posted 8y ago by Anders Gustafson‭  ·  last activity 8y ago by Anders Gustafson‭

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Q&A Different gravitational and inertial mass

This is going to take some imagination and assumptions (and knowledge about physics). Imagine gravitational mass and inertial mass would be different. In classical mechanics it seems a coincidence...

5 answers  ·  posted 9y ago by Mark‭  ·  last activity 8y ago by Mark‭

Question physics
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Q&A Could a universe with a reverse of the relativity of our universe be self consistent?

In our universe if there are two objects that are moving relative to each other then each will see the other's length contracted in the direction of motion and it will see the others clocks running...

1 answer  ·  posted 8y ago by Anders Gustafson‭  ·  last activity 8y ago by Anders Gustafson‭

Question physics relativity
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Q&A What happens if everything stops?

Suppose, through some fantastical mechanism, all macroscopic (i.e. reasonably massive) objects in the universe were instantly made at rest. In other words, the relative velocity between every two ...

5 answers  ·  posted 9y ago by Dan Bryant‭  ·  last activity 8y ago by Dan Bryant‭

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Q&A How to convert a traversable wormhole into a black hole?

So the premise goes: A previously-traversable wormhole evolves into a black hole because (x) happens. What's (x)? What would it take for this to occur? Either naturally (a cosmic occurrence), by ...

3 answers  ·  posted 8y ago by equustel‭  ·  last activity 8y ago by equustel‭

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Q&A In three spatial dimensions, would it be possible to have a force that decreases with the inverse of the distance?

I know that in our universe, electromagnetism and gravity decrease with the inverse of the distance squared. Would it be possible though for there to be a force in another universe with three spati...

2 answers  ·  posted 8y ago by Anders Gustafson‭  ·  last activity 8y ago by Anders Gustafson‭

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Q&A How does my aliens' tractor beam work in space?

Researchers create a sonic tractor beam By Hanae Armitage 27 October 2015 1:00 pm Using a simple set of loudspeakers, scientists have figured out a way to levitate and rotate object...

7 answers  ·  posted 8y ago by chasly from UK‭  ·  last activity 8y ago by chasly from UK‭

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Q&A Gravity solutions on space vessel

I first was thinking centripetal force on a circular ship, but performing external maintenance would be extremely difficult due to the force pushing the person or robot off. Would a spherical ves...

5 answers  ·  posted 9y ago by Damien Andre‭  ·  last activity 8y ago by Damien Andre‭

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Q&A How can species pass on their genes to the next generation quantum mechanically at a distance?

Suppose in one part of the universe unexplored by science, I imagine there exist a species that rely on quantum teleportation to transmit information about their genetic codes across to the other s...

4 answers  ·  posted 8y ago by user6760‭  ·  last activity 8y ago by user6760‭

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Q&A Semi-liquid atmosphere - Atmospheric and Visual Effects

Question 2 of Semiliquid atmosphere - Is my premise/conclusions correct; and will it get the result I want? Atmospheric effects - As mentioned before, I prefer it to be visually very similar to o...

1 answer  ·  posted 8y ago by spicklesandwich‭  ·  last activity 8y ago by spicklesandwich‭

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Q&A Feasibility of life on a moon

I'm trying to picture life on a planet sized moon of a huge planet in a one-star stellar system. It would be tidally locked, which could do some interesting things. It has an iron/nickel core for t...

2 answers  ·  posted 8y ago by Louis McElveen‭  ·  last activity 8y ago by Louis McElveen‭

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Q&A Could a force with these properties exist in a parallel universe?

In an alternate universe there is a force known as the emotion force although the force has nothing to do with emotions. Anything that interacts through the emotion force has an emotion charge tha...

3 answers  ·  posted 8y ago by Anders Gustafson‭  ·  last activity 8y ago by Anders Gustafson‭

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Q&A What are some of the ramifications and consequences of this world's'"exoticness"?

For my Science-Fantasy WIP I am considering using a single artificial planet (roughly the size of a Dyson Sphere) and its moons (of which only three are large enough to exert any real influence) as...

4 answers  ·  posted 9y ago by Trismegistus‭  ·  last activity 8y ago by Trismegistus‭

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Q&A What mass for my space station to have enough gravity to attract satellites?

Think about a big space station or whatever giant space building. What will be its mass to attract (with gravity): Small asteroids (1-10 kg / 2-20 lbs) Spaceman (100 kg / 220 lbs) Satellites (...

3 answers  ·  posted 8y ago by Neekobus‭  ·  last activity 8y ago by Neekobus‭

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Q&A Could a wormhole exist on a planet?

For my story to work, my characters have to stumble across a small wormhole that actually exists on Earth and is responsible for multiple disappearances throughout history. It connects a point on E...

3 answers  ·  posted 8y ago by Alyk‭  ·  last activity 8y ago by Alyk‭

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Q&A I want to eliminate the Earth's axial tilt. How do I do it?

I am an immortal, megalomaniacal supervillain with unlimited resources and patience. I want to slowly eliminate the Earth's axial tilt so that its equatorial plane is coplanar with its orbital pla...

2 answers  ·  posted 8y ago by dirtside‭  ·  last activity 8y ago by dirtside‭

Question physics earth
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Q&A You have some cheat codes for real life, but they're expensive to use. Can they still be used?

While smashing heavier and heavier particles together to create super heavy elements 122, 123, and 124, scientists noticed that these collisions created strange, random-looking electromagnetic wave...

12 answers  ·  posted 8y ago by Thatguypat‭  ·  last activity 8y ago by Thatguypat‭

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Q&A bringing darkness to live

Every child is afraid of the darkness. For them its not simply the absence of light, its the absence of information. Even if you know that there should be a wall or a doorway right in front of y...

4 answers  ·  posted 8y ago by DenDenDo‭  ·  last activity 8y ago by DenDenDo‭

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Q&A Is life possible on a world where the water floats in the air?

Let's assume I have a planet and the planet itself is made out of something solid. Around the floating rock is a layer of gas, then a layer of liquid and then a layer of gas again. Thus the sea fl...

1 answer  ·  posted 8y ago by BlueWizard‭  ·  last activity 8y ago by BlueWizard‭

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Q&A Physics of magically enhanced travel

Background I have a character. He is the master of a particularly specific martial art that is pretty much only movement. But it's pretty powerful, in that he can separately: a) move in a manner t...

2 answers  ·  posted 9y ago by Jake‭  ·  last activity 8y ago by Jake‭

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Rigorous Science Large spider walking upside down

Many fantasy stories involve large spiders like in Harry Potter. These creatures behave almost exactly like normal spiders despite their size. My question is: can large spiders still walk upside d...

2 answers  ·  posted 8y ago by Vincent‭  ·  last activity 8y ago by Vincent‭

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Q&A Can a planet with a dead core still generate a strong magnetic field?

Imagine a world with a dead core, like Mars, but covered in water. This world has managed to hold on to its atmosphere and quite a bit of its water as well. I'm sure the prodigious life there would...

3 answers  ·  posted 8y ago by Josh Belmont‭  ·  last activity 8y ago by Josh Belmont‭

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Q&A What is the maxiumum depth for an Earth like atmosphere?

I am sure most of you have seen Star Wars. In Episode IV: The Empire Strikes Back our heroes travel to Bespin, a gas planet with a habitable zone to refuel at the floating cloud city. Well of cou...

1 answer  ·  posted 8y ago by Josh Belmont‭  ·  last activity 8y ago by Josh Belmont‭

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Q&A Ocean and air currents on a water planet

I just stumbled across this website the other day, and this is my first time posting, so apologies if the question is too vague or improperly worded. I am trying to build an all ocean world. I'm ...

3 answers  ·  posted 9y ago by Cascadiahawk‭  ·  last activity 8y ago by Cascadiahawk‭

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Q&A What if the speed of light were 100 times higher?

Imagine the speed of light is 100 times that in our universe. Light from the moon takes about 1/100th of a second, the sunlight reaches our eyes in about 4 seconds, from nearby Alpha Centauri in ab...

7 answers  ·  posted 9y ago by Serban Tanasa‭  ·  last activity 8y ago by Serban Tanasa‭

Question space physics
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Q&A Excluding pressure and breathing issues, how long can someone survive unprotected in space?

Bob escaped from his exploding spaceship in the world's most ghetto escape pod - an airtight metal box, with only some respiratory gear ($\text{O}_2$ tank, $\text{CO}_2$ filter) as company. Now he'...

4 answers  ·  posted 8y ago by Fhnuzoag‭  ·  last activity 8y ago by Fhnuzoag‭

Question space physics
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Q&A I would like to know if "imaginary velocity" has serious problem

I am writing a SF story, in this story, a life-form(You can just call them alien) from another universe comes to earth. They used "imaginary velocity" to make their time elapse faster than all bein...

6 answers  ·  posted 9y ago by fairytale‭  ·  last activity 8y ago by fairytale‭

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Q&A How long until a small black hole makes the sun fail?

Imagine aliens dropped a small black hole (say, 1% of the moon's mass, so you wouldn't notice the difference in gravitation) into the sun (from the far side of the sun, so nobody on earth can see i...

3 answers  ·  posted 9y ago by celtschk‭  ·  last activity 9y ago by celtschk‭

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Q&A Destructibility of robots made from the strongest materials on the planet

Looking at all the movies that involve robots made from materials available from planet earth (think Pacific Rim, Iron Man etc. but not Transformers), what is the theoretical limit of the capabilit...

2 answers  ·  posted 9y ago by Michael Lai‭  ·  last activity 9y ago by Michael Lai‭

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Q&A What are the dangers of using fusion rocket engines in atmosphere?

As far as I understand, when you fuse deuterium (H-2) and tritium (h-3), you get a helium atom and a spare neutron. Basically alpha-rays? Now alpha rays are easily blocked by matter. You can block ...

3 answers  ·  posted 9y ago by Avanak‭  ·  last activity 9y ago by Avanak‭

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Q&A Where are all the bodies?

In my near (+200 years) future world teleportation has been invented and is now in common use especially for off-world travelling, but it works by creating a perfect copy of the travelling human ne...

6 answers  ·  posted 9y ago by Marv Mills‭  ·  last activity 9y ago by Marv Mills‭

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Q&A Which types of firearms would be damaged or broken by a global change in combustion intensity?

I'm wondering what types of firearms would be impacted if explosives and combustion in general were to have a random chance of being more potent or less potent. Could new firearms and/or ammunition...

4 answers  ·  posted 9y ago by Jonathan‭  ·  last activity 9y ago by Jonathan‭

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Q&A What are the ramifications of exoskeletal powered armor for a rat?

Al is a rat. He is also an engineer of quite a high caliber. He has developed a suit of power armor, with a movement-assisting exoskeleton that greatly increases his strength, speed, and endurance....

1 answer  ·  posted 9y ago by Lepidolite Mica‭  ·  last activity 9y ago by Lepidolite Mica‭

Question physics
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Q&A Could the moons of a Gas Giant all be habitable if that planet was in the habitable zone?

I ask this as a basis for a World (in this case Moons) Building I'm doing. I came up with a couple of different problems and some possible solutions to those problems: All of these questions pre...

2 answers  ·  posted 9y ago by Hirahito‭  ·  last activity 9y ago by Hirahito‭

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Q&A Acceleration insulation: I can build the Moon cannon, now what?

This is steampunk, so assume a non-relativistic, non-quantum world (but more on that shortly). I want a material that insulates against acceleration but not gravity. Full explanation: This is t...

4 answers  ·  posted 9y ago by Tristan Klassen‭  ·  last activity 9y ago by Tristan Klassen‭

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Q&A New York to Los Angeles using no fuel

In my very lengthy story in the near future, there are some great 'Modern Marvels'. The next one I'm going to introduce might not be feasible, but if it is, I'd like to attach some numbers to it. ...

3 answers  ·  posted 9y ago by Mikey‭  ·  last activity 9y ago by Mikey‭

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Q&A Could a non-relativistic universe be logically consistent?

As I understand it, the principle of relativity was accepted from Galileo until Maxwell, whereupon the equations which predict constant speed of light imply a preferred reference frame in a Euclidi...

2 answers  ·  posted 9y ago by spraff‭  ·  last activity 9y ago by spraff‭

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Q&A How would two planets with identical but perpendicular orbits affect each other?

I'm exploring this idea for a fantasy world, and I was wondering how these planets would affect each other. The system would feature orbits in all three dimensions, not relatively flat like ours is...

4 answers  ·  posted 9y ago by Xethaios‭  ·  last activity 9y ago by Xethaios‭

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Q&A How feasible is it to expect a major breakthrough that allows us sci-fi space travel (and related tech)?

After reading hours on here, I stumbled upon alot of answers that rely on some major changes in our understanding of space and time and its tech to allow us control antimatter or some future thrust...

5 answers  ·  posted 9y ago by Buni‭  ·  last activity 9y ago by Buni‭

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Q&A Could we transport matter to other planets with a charged particle beam?

Instead of flying say tons of metal and/or water and other raw materials/molecular matter to the Moon or Mars, could we shoot it there in ionized form by accelerating these sufficiently? Maybe sub...

5 answers  ·  posted 9y ago by masterxilo‭  ·  last activity 9y ago by masterxilo‭

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Q&A What would the orbit of the Earth be like if we constantly sent our waste to the Sun?

Let's say we get a cheap technology to collect and then send (hypothetically all) our waste to the Sun by a rocket, and we choose this technology as the main (and only) method to utilize our waste....

4 answers  ·  posted 9y ago by alex‭  ·  last activity 9y ago by alex‭

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Q&A What could cause rock formations (small stones, boulders, islands...) to levitate?

You see this in quite a bunch of movies / books (think avatar). What could be a reasoned physical explanation of such phenomenon? Would this explanation impact other things on a planet? Like most...

8 answers  ·  posted 9y ago by Sheraff‭  ·  last activity 9y ago by Sheraff‭

Question biology physics
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Q&A Would Building a Waypoint/Colony station in Slip Space be Logical?

Definitions: Slip Space - The area of space separating planes of the universe. Think of the universe as a flat piece of paper. Now imagine this flat piece of paper wrapped into a spherical ball. T...

2 answers  ·  posted 9y ago by JDSweetBeat‭  ·  last activity 9y ago by JDSweetBeat‭

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Q&A Planetary Habitability at twelve to seven billion years ago

Following this question, I had additional question of habitability. Assuming that life could exist on planet formed roughly twelve billion years ago, allowing complex life to exist as of seven bill...

4 answers  ·  posted 9y ago by Hendrik Lie‭  ·  last activity 9y ago by Hendrik Lie‭

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Q&A What if time travel had to take into account spatial distance?

In this setting, humanity has advanced to the technological capability of extra stellar travel via faster-than-light drives. However, due to distances between inhabited areas being extremely large,...

3 answers  ·  posted 9y ago by Zer0ah‭  ·  last activity 9y ago by Zer0ah‭

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Q&A Is "Time Travel" to the future currently possible?

I was wondering if there is a realistic way that one can "travel" to the future, using today's technology. Two scenarios I have thought of: An individual is put under cryogenic freezing and then ...

6 answers  ·  posted 9y ago by crusarovid‭  ·  last activity 9y ago by crusarovid‭

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Q&A How to enter the orbit of a gas giant?

A great many questions have been written about a habitable moon around a gas giant. This is my take on it. Somehow (extra points to whoever figures out exactly how it is possible) Jupiter gets kno...

1 answer  ·  posted 9y ago by JDSweetBeat‭  ·  last activity 9y ago by JDSweetBeat‭

Question space planets physics
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Q&A What would be the implications of the cosmos actually being filled with ether?

I'm working on a space-fantasy setting and one of the cosmological quirks is that the cosmos, instead of being a vacuum, is actually filled with a gaseous substance. As a result, the entire cosmos ...

3 answers  ·  posted 9y ago by Trismegistus‭  ·  last activity 9y ago by Trismegistus‭

Question space physics