Search found 13 matches

by Aleksander
Fri Aug 01, 2014 4:04 pm UTC
Forum: Science
Topic: "Fat" Universe Theory
Replies: 50
Views: 7783

Re: "Fat" Universe Theory

gmalivuk wrote:If "reality = math" isn't an interesting hypothesis, that doesn't make it a false one.


Like the hypothesis "God created the universe"?
by Aleksander
Sun May 11, 2014 12:13 am UTC
Forum: Language/Linguistics
Topic: Best Writing System?
Replies: 60
Views: 42648

Re: Best Writing System?

Do you actually speak one of these languages? Sure, the gross meanings are usually the same, but please don't underestimate what 2,000 years of divergence does to a language. 本 in Chinese means "root" or "origin," as in 本來-"originally." In Japanese, it means "book...
by Aleksander
Sun May 11, 2014 12:04 am UTC
Forum: Language/Linguistics
Topic: Comparison between Korean and Japanese subject/topic markers
Replies: 1
Views: 2875

Re: Comparison between Korean and Japanese subject/topic mar

How hazardous is it for someone who knows some Japanese to think of 은/는 and 이/가 as analogous to はand が? This will work in almost any situation. In other words, if you would use は in Japanese, you should almost certainly use 은/는 in Korean; and 이/가 for が. I know this because I speak Japanese and a li...
by Aleksander
Sat Apr 19, 2014 1:39 pm UTC
Forum: Science
Topic: Cat Question
Replies: 6
Views: 2273

Re: Cat Question

Our cat's just had kittens (awwww), and during the preceding weeks I learnt that a batch of kittens can have more than one father. I was intrigued enough by this fact to google a little, and was surprised to find that the same can actually happen in humans :o. https://en.wikipedia.org/wiki/Superfec...
by Aleksander
Sat Aug 17, 2013 1:24 pm UTC
Forum: Science
Topic: Amplitude in metres
Replies: 12
Views: 5404

Re: Amplitude in metres

Right, I knew that! Thanks for correcting my fundamental error about mechanical waves. I think the reason for my confusion was that EM waves are often presented as two perpendicular waves: the electric and the magnetic field, each traveling along the same axis, but oscillating spatially in different...
by Aleksander
Sat Aug 17, 2013 9:52 am UTC
Forum: Science
Topic: Amplitude in metres
Replies: 12
Views: 5404

Amplitude in metres

I was thinking about the physical interpretation of the amplitude of electromagnetic waves, and it should be the spatial distance between the average value and the peak value of the electric and magnetic fields. But I have never heard anyone talk about the amplitude of EM waves in metres: it is usua...
by Aleksander
Sun Aug 11, 2013 12:47 am UTC
Forum: Science
Topic: Is a previous spacefaring species on Earth possible?
Replies: 102
Views: 32397

Re: Is a previous spacefaring species on Earth possible?

I started reading this thread assuming that the answer to the question it posed would quickly turn out to be a resounding "no", but idobox actually has me convinced this would be entirely possible. Fascinating.
by Aleksander
Thu Jul 18, 2013 2:20 pm UTC
Forum: General
Topic: Galilean:x' with respect to S'? AND SPECIAL BONUS x' = x-d?
Replies: 908
Views: 172456

Re: Galilean:x' with respect to S'?

For what it's worth, I really enjoyed Schrollini's course. I learned what a manifold is, and got a much clearer understanding of coordinate mappings/transformations than the intuitive understanding I had from beforehand. Thank you!
by Aleksander
Fri Feb 22, 2013 7:01 am UTC
Forum: Science
Topic: Why do some people believe the universe is infinite?
Replies: 91
Views: 14509

Re: Why do some people believe the universe is infinite?

Doesn't that part contradict the part right before it: On January 11, 2013, a large quasar group, the Huge-LQG, was discovered, which was measured to be four billion light-years across, the largest known structure in the universe.[38] 4 billion light years is a much bigger distance than 300 million ...
by Aleksander
Wed Nov 09, 2011 8:09 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0975: "Occulting Telescope"
Replies: 66
Views: 20352

0975: "Occulting Telescope"

Image
http://xkcd.com/975/

Alt Text: Type II Kardashev civilizations eventually completely enclose their planetary system in a Dyson sphere because space is way too big to look at all the time.

I kind of like the stars though :'o
by Aleksander
Thu Aug 05, 2010 2:52 am UTC
Forum: Science
Topic: The relativistic doppler effect
Replies: 8
Views: 1507

Re: The relativistic doppler effect

It doesn't take an enormous knowledge at all, I covered it in the first semester physics course. You just need to know length contraction and time dilation. Are you familiar with those? I know the basics, but I don't understand how length contraction would have an effect on a point-particle, which ...
by Aleksander
Thu Aug 05, 2010 12:27 am UTC
Forum: Science
Topic: The relativistic doppler effect
Replies: 8
Views: 1507

Re: The relativistic doppler effect

When you measure frequency, you are watching the peaks of some wave go by. You aren't asking, "how fast did that peak just go by me?" but rather, "how long till I see the next one?" In classical doppler, both of these have different answers depending on observer speed, but in th...
by Aleksander
Wed Aug 04, 2010 2:14 am UTC
Forum: Science
Topic: The relativistic doppler effect
Replies: 8
Views: 1507

The relativistic doppler effect

I'm having trouble understanding why the doppler effect is happening with electromagnetic waves. The classical doppler effect is not too hard to grasp, given that the relative speed of the physical waves approaching an observer will change dependent on whether the observer is moving or not. The wave...

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