Recent content by KingGambit

I mean "Illuminati" like this Illuminati ambigram :smile:

Illuminati ᴉʇɐuᴉɯnʅʅI, It doesn't work 😭

Today I learned that Carboniferous actually means, COAL, not Carbon as in carbon element. It's from Latin, Carbo, meaning coal. I already knew that there were giant insects in carboniferous, because of high oxygen level. While insects respire oxygen from osmosis through their skin, not lung. So...

What the....?? How the hell can you do that

First, I'd like to say that this PF forum software is a very, very impressive software. It has everything, coding format, BB Code, LaTex, etc.. and also spoiler section/module. It even has a nested spoiler. But can we change the title spoiler with something else? Because sometimes I don't mean...

Yes @DrGreg, I'm really sorry for my carelessness. I'm new in SR (much less GR), so I don't really memorize Lorentz Factor, Gamma, Beta, velocity addition by heart. And I answer in a hurry.

Oops, I'm so sorry. This is the first time I use BB Code, Yes, it's 1+sqrt(v1 * v2), but in the midst of it, I typo negative instead of positive. My apologize. Edit: LaTex.

Sorry, V = 1/3

What if we change the statement. They are passing each other at 0.6c, what would the middle observer see calculate each respective speed? $$0.6 = \frac {2v} {1-\sqrt{v^2}}$$ $$v\approx 0.333$$

Ahh.., oh my God. You're right. My carelessness. I was mislead by the OP question If the universe is void of all matter save two rockets and they are passing each other at the speed of light like... And in my mind, the both are traveling, and that seems to suggest that there is another observer...

Ahh, yes. I agree. They can't see it slowed down or faster. It's a calculation based on the doppler effect, relativistic doppler effect I might say. Yess, I also agree. The OP states that the ship passing each other, each will see the other clock sped up, again to see the "real" clock speed...

According to whom? As long as both are not accelerating, both will see themselves stationary and the other is the one who is moving. According to whom? Yes, that's true. According to relativity velocity addition formula. But in this case you'll need a third observer E. So this observer, E, see...

Dear PF Forum, What is CNO Cycle? Is it Carbon Nitrogen Oxygen cycle or Carbon Neon Oxygen? Veritasium CNO cycle In this video, Derek Muller says that Carbon fuses into Neon, and Neon fuses into Oxygen. I can't imagine that Derek makes an error here. But for myself, I get a little confused...

Nope, because C = A + B, so A+B-C = 0, Let's see. c = a + b. $$Multiply both sides by ##a-b##:$$ (a - b)c = (a - b)(a+b). $$Expand:$$ ac - bc = a^2 - b^2. $$Rearrange:$$ b^2 - bc = a^2 - ac. $$Add ##ab## to both sides:$$ ab + b^2 - bc = a^2 + ab - ac. $$Factorise:$$ (a+b-c)b = (a+b-c)a. = 0xB...

Ahh, un deux trois quartre cinq