# Tag Info

12

hydrogen is too weak – one flaming arrow and the approaching flying battle-platform turns into (cinematographically appealing) fireworks. Only if your engineers are idiots. The cinematic flames from the Hindenburg crash are not burning hydrogen--they are from the combusting envelope, which was basically painted with jet fuel. The hydrogen didn't help, ...

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Matter - Antimatter Annihilation (Or just run matter into energy) Have you heard about mass-energy equivalence? It states that mass is equivalent to raw energy, and energy to mass in this formula: $$E = mc^2$$ That means that each gram of matter has 89,875,517,873,681,764 Joules of energy, that is, 90 petajoules. Annihilate a gram of matter with a gram of ...

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Non-orientable wormholes The problem with antimatter is that you have to expend energy to create it. It might serve as a good energy storage medium, and there are interesting things you can do with animatter that you can't trivially do by other means, but by itself it isn't a source of energy and it couldn't replace fusion (there are potentially similar ...

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You don't even need to drink superfluid: you already would become covered in thin film of superfluid both outside and inside a few moments after you opened container holding it. Dependenig on fluid composition it can (optionaly): suffocate you - it will cover you lungs inside for sure. If it has large molecules ("not superfluid water") it will prevent ...

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I’d assume your humanoid has not enough mass and not enough muscles and energy to play a big role at all. On top of it some of the energy will be transferred into angular velocity. So even if it alters the asteroid course just so slightly it very likely will be not be enough to come back ever again as it is with the flying joint. We are talking here 26km/s ...

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Since you want a layman’s tool — implying no knowledge or limited knowledge about plasma physics and the mathematics required to perform simulations You might consider the Remote Glow Discharge Experiment which allows you to control a plasma source via your web browser. If you have the willingness to learn then there are many tools and frameworks that can ...

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If you're dealing with constant acceleration, and you aren't interested in orbital mechanics, the basic equation relating how much Time "T" takes to accelerate from Starting Speed "S1" to Target Speed "S2" at Acceleration "A" is: So you can solve for T, like this: and then just plug in your numbers. So if you started at 0 m/s: and the result is close to ...

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Short version : the second planet (same total mass) will have a radius that is larger than the first unless the second planet's core is larger (in mass) than the first. This makes perfect sense if you think about it. The smaller core has to have much more of the lighter exterior material to make up the total mass. The larger core needs less to make the ...

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Penrose process By splitting a chunk of matter in two near a black hole in such a way that one piece drops into the black hole and the other escapes it, one can extract its rotational energy. This has way better energy efficiency than fusion (about 29% of original BH mass can be harvested), possibly more when using charged black holes. Description on ...

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I think you are mixing up superfluidity and superconductivity. The first has electrical neutral particles moving frictionless the other has charge moving frictionless. (To my understanding) Both phenomena can to some degree described similarly. Yet superfluids are special because they are fluids that show no friction and superconductivity is special because ...

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Zeng et al. (2015) "Mass-Radius Relation for Rocky Planets based on PREM" might be useful for you. They give the following equation: $$\frac{R}{R_\oplus} = \left(1.07 - 0.21 \cdot \mathrm{CMF}\right) \cdot \left(\frac{M}{M_\oplus}\right)^{1/3.7}$$ Where $R$ and $M$ are the planetary radius and mass respectively, $R_\oplus$ and $M_\oplus$ are the radius ...

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