Recent content by javascripter

  1. J

    Radiative cooling time derivation (for ambient temperature = 0 °K)

    as T_∞ = 0 , I use Q=−F\epsilon A\sigma T^4 for this problem as the integration is much easier, so we start with mcdTdt=−F\epsilon A\sigma T^4 rearrange so T is on one side and t is on the other: −mcF\epsilon A\sigma T^4dT=dt on the left side I integrate from the initial temperature (Ti)...
  2. J

    How does an umbrella create a similar effect to a radio with sound?

    Oh wow, that is really cool and interesting. And weird.
  3. J

    How does an umbrella create a similar effect to a radio with sound?

    So today I was holding up an umbrella near someone playing music, and it sounded like the music was coming from the top of my umbrella. Is this a similar effect to a radio? Can it be seen as sound being a disturbance of the air that causes the metal to vibrate which amplifies it to make it...
  4. J

    Implosion grenades: do they exist?

    Ah, ok. I didn't know much about antimatter other then it went away when combined with normal matter, so ya, antimatter doesn't sound like it makes implosions. I hereby come to the conclusion that with our current understanding of physics logical implosion grenades are impossible. The Thing...
  5. J

    Implosion grenades: do they exist?

    Oh, that is slightly humorous, I said Archimedes and then forgot about his mirror towers. (That show that light can cause damage.(realized that sentance was horrible communication, but hopefully you get what I meant by "cause damage".)) I didn't think about it, but I guess if you had dense...
  6. J

    Implosion grenades: do they exist?

    That is what I figured. (Especially on the third one. Unless through some magic you could convert it to light, in which case you are the <Tesla/Da Vinci/Archimedes> of this age. Would that work if we figured a way out to do that?) Forgot criteria for it to count as a grenade. So here it is...
  7. J

    Implosion grenades: do they exist?

    So I was reading some books with implosion grenades in them, and was wondering if they were theoretically possible. Here are a few things I came up with from research and my own brain, the ones from my own brain may be garbage, and if so please let me know. So apparently a light bulb is...
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