MetalLord (u/MetalLord)

MetalLord commented on Negative Mass students.tools/negative-m... · Posted by u/thunderbong

Ecco · 2 years ago

Fun website, but I’m not quite sure what their point is. Are they trying to say that negative mass can have a meaning sometimes? Or is it just « let’s run a simulation on those equations using a negative mass ans see what happens » ?

MetalLord · 2 years ago

Well... The website seems like it just messes with things. But I remember an article claiming that phonos of sound in atmosphere behave like they have negative mass. Cause the sound wave would travel faster in the denser layers of air from the bottom, making the sound wave to go a little upwards, like a refraction.

MetalLord commented on Tungsten gold plated bar tungsten-alloy.com/gold-p... · Posted by u/peter_d_sherman

detrites · 2 years ago

> In theory, as the density of uranium is 19.1g/cm3, which is approximately 70% denser than lead, tungsten gold plated bar and tungsten alloy gold bar could be used as material of making fake gold products.

Why does this article begin talking about Uranium and lead and then immediately non sequitur into tungsten? There must be something I'm missing?

MetalLord · 2 years ago

Ha. So I searched with the first phrases, and there are multiple results that are identical. But then there's this :"In theory, as its density is 19.1g/cm3, which is approximately 70% denser than lead, uranium could be used as material of making fake coin. However, it is weakly radioactive and not as dense as gold, so it does not appear to be a practical method. Then people have discovered that tungsten is environmental-friendly, durable and hardness, the most important is that its density of 19.25g/cm3 is just about the same density as gold (19.3g/cm3), which bears the similar specific gravity." So I guess someone copy pasted a mistake that someone did when shortening the original version.

http://news.chinatungsten.com/en/tungsten-dart-news/46-tungs...

MetalLord commented on Japan tests explosion-powered rocket for the first time in space (2021) autoevolution.com/news/ja... · Posted by u/zeristor

badrabbit · 3 years ago

ELI5: why don't they use "tiny nukes", basically engineer a small (less than 10cm/1in) nuclear bombs that explode in a chamber at the back of the space ship?

MetalLord · 3 years ago

It was thought of https://en.m.wikipedia.org/wiki/Project_Orion_(nuclear_propu...

Now I don't know how feasible is making a nuke as small as you suggest.