Search found 150 matches

by timonan
Wed May 25, 2011 6:05 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0903: "Extended Mind"
Replies: 666
Views: 184454

Re: 0903: "Extended Mind"

Everyone is saying "Mathematics" leads to "Quantity," but the first link in "Mathematics" is "Study," which leads to a loop back to Mathematics. I'm assuming that's a new edit.
by timonan
Tue Feb 08, 2011 7:10 am UTC
Forum: Mathematics
Topic: Question about a solid of revolution
Replies: 7
Views: 1200

Re: Question about a solid of revolution

Thanks, that's very helpful. I wasn't breaking it up into different sections, which makes sense now that you mentioned it, and I didn't think to just consider the outermost radius at any given spot. I was picturing a big blob with different radii spinning inside each other, but when I just think of ...
by timonan
Mon Feb 07, 2011 7:29 pm UTC
Forum: Mathematics
Topic: Question about a solid of revolution
Replies: 7
Views: 1200

Re: Question about a solid of revolution

Sorry, an example would have definitely helped. Something like the area between f(x) = x^2 - 4 and g(x) = -x^2 + 3, revolved around the x-axis. The axis of revolution, y=0, goes right through the area to be revolved.
by timonan
Mon Feb 07, 2011 9:12 am UTC
Forum: Mathematics
Topic: Question about a solid of revolution
Replies: 7
Views: 1200

Question about a solid of revolution

This will probably have an easy answer, but it's got me stumped. I've been trying to get back into calculus (haven't used it since college), and I'm reviewing the disk/washer method of calculating the volume of a solid of revolution. It makes sense to me that if the axis of rotation is just touching...
by timonan
Tue Sep 21, 2010 8:03 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 53197

Re: Meta Forum Game

Deduction of 20 points given to every player for delay of game.
by timonan
Mon Jul 19, 2010 8:03 am UTC
Forum: Mathematics
Topic: Hands of a clock
Replies: 9
Views: 1444

Re: Hands of a clock

By the way, here's what I reasoned with the infinite series: In the distance (in minute marks on the clock) it takes the minute hand to once again be across from the hour hand, the hour hand has moved ahead a twelfth of that distance, which the minute hand now needs to cover, ad infinitum: 6...
by timonan
Mon Jul 19, 2010 7:50 am UTC
Forum: Mathematics
Topic: Hands of a clock
Replies: 9
Views: 1444

Re: Hands of a clock

Ha ha nice! I should have known it wasn't that simple if you were asking. I worked it through like you said, and it basically had the effect of a magic trick on me. Loved it.
Spoiler:
11 times.
by timonan
Mon Jul 19, 2010 7:28 am UTC
Forum: Mathematics
Topic: Hands of a clock
Replies: 9
Views: 1444

Re: Hands of a clock

That's exactly what I did, using their respective angular velocities as rates, so my answer should be right. And I just realized a way to solve each configuration using an infinite geometric series and got the same answer. In regard to the second question: I'm assuming it happens 12 times in 12 ...
by timonan
Mon Jul 19, 2010 6:50 am UTC
Forum: Mathematics
Topic: Hands of a clock
Replies: 9
Views: 1444

Hands of a clock

I glanced at the clock at the pizza place tonight, and it was about 7:05 pm. Doesn't sound special, but it looked cool - the hour and minute hands were facing in the exact opposite directions, forming a perfectly straight line. I was curious as to exactly what time this would happen. I knew it has t...
by timonan
Sat Jul 10, 2010 1:25 am UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 720263

Twin paradox

I've been wanting to get a decent grasp on relativity, because it's always been a bit over my head, so I've just started reading through About Time by Paul Davies. I've reached the section where he's talking about the Twin Paradox, and, though he does an admirable job of trying to explain it, I stil...
by timonan
Tue May 11, 2010 6:32 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 53197

Re: Meta Forum Game

Long confused pause...................game resumes.
by timonan
Mon May 10, 2010 9:03 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 53197

Re: Meta Forum Game

Quick collection of points while everyone is ranting, though most is obtained through blatant cheating.
by timonan
Sun May 09, 2010 2:40 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 53197

Re: Meta Forum Game

Game is not returned to.
by timonan
Sat May 08, 2010 9:09 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 53197

Re: Meta Forum Game

asiekierka wrote:A beg to ban the next poster that does a meta forum post.


Uncertainty regarding what "meta forum" could possibly mean.
by timonan
Fri May 07, 2010 9:09 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 53197

Re: Meta Forum Game

Reminder that there are only 2 days left in the bonus round.
by timonan
Tue Nov 24, 2009 9:42 am UTC
Forum: Logic Puzzles
Topic: Only one number in the English Language...
Replies: 9
Views: 4699

Re: Only one number in the English Language...

How about e?
by timonan
Fri Nov 06, 2009 6:56 am UTC
Forum: Music
Topic: Classical piano recommendations?
Replies: 12
Views: 2301

Re: Classical piano recommendations?

Thanks for the recommendations. They all sound perfect for me. I'm working through Pathetique right now....wonderful.
by timonan
Thu Oct 29, 2009 9:02 am UTC
Forum: General
Topic: The ax
Replies: 50
Views: 4521

Re: The ax

This 'paradox' is also commonly known as the Ship of Theseus . You'll even find a section on that page about "George Washington's Axe". Further down the article is a reference to David Wong's book "John Dies at the End," which appears to be the inspiration for the above story, a...
by timonan
Sat Oct 10, 2009 8:03 pm UTC
Forum: Music
Topic: Classical piano recommendations?
Replies: 12
Views: 2301

Re: Classical piano

You're right, the amateur reference is very vague. I've actually learned the songs I mentioned above (still working on Liebestraum), though they all took a long time to piece together. If I sit down and try to sight read something cold, I play it very slow. But I'm good with rhythm and fingering, so...
by timonan
Sat Oct 10, 2009 10:08 am UTC
Forum: Music
Topic: Classical piano recommendations?
Replies: 12
Views: 2301

Classical piano recommendations?

Like some of you may have done, I took a bunch of years of piano as a kid, and now I'm trying to get back into it. I used to hate the classical music they made me learn, but, just like my mom promised, I appreciate it more now. I'm trying to learn some new pieces, which includes the obvious ones (Mo...
by timonan
Wed Aug 12, 2009 5:05 am UTC
Forum: Logic Puzzles
Topic: Letters
Replies: 5
Views: 1141

Re: Letters

Nice work. You may want to put your answer in a spoiler for future viewers.

As far as q - k, you'll have to take that up with the English language.

Edit: thanks.
by timonan
Wed Aug 12, 2009 4:26 am UTC
Forum: Logic Puzzles
Topic: Letters
Replies: 5
Views: 1141

Letters

What about the first letter suggests the second?

f - e
h - a
m - e
q - c
r - a
w - d
y - w
by timonan
Mon Jul 20, 2009 9:28 pm UTC
Forum: Mathematics
Topic: Palindromic numbers
Replies: 17
Views: 2319

Palindromic numbers

I figure there are some interesting qualities of palindromic numbers. It seems like there would have to be an infinite number. Is it possible to determine what percentage of numbers are palindromic? Or what percent of palindromic numbers are prime? How about a perfect square palindromic number of an...
by timonan
Sat Jul 11, 2009 9:52 pm UTC
Forum: Logic Puzzles
Topic: Add some numbers
Replies: 5
Views: 1416

Add some numbers

Take the digits 1, 2, 3, and 4. Rearrange them into every possible permutation (1234, 4123, 1432, etc). Without using a calculator or writing anything down, add all of these numbers together. What is the sum?

For more of a challenge, try 1, 2, 3, 4, and 5.
by timonan
Sat Jul 11, 2009 8:53 pm UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 53197

Re: Meta Forum Game

Accidental erasing of everyone's scores.

Embarrassed laugh.

Halfhearted excuse that the posts were straying from the game anyway.
by timonan
Fri Jun 05, 2009 1:05 am UTC
Forum: Mathematics
Topic: Most frequently occuring digit
Replies: 17
Views: 1858

Re: Most frequently occuring digit

Or my speculation engine...reasoned imagination.
by timonan
Thu Jun 04, 2009 9:15 pm UTC
Forum: Mathematics
Topic: Most frequently occuring digit
Replies: 17
Views: 1858

Re: Most frequently occuring digit

My original post was admittedly very general, but it had something like Benford's Law in mind. The way we use numbers isn't based (most of the time) on arbitrary strings of digits. We have a natural desire for patterns and symmetry, so there should be distinct patterns in the types of numbers we com...
by timonan
Wed Jun 03, 2009 12:34 am UTC
Forum: Mathematics
Topic: Most frequently occuring digit
Replies: 17
Views: 1858

Most frequently occuring digit

Of the digits 0-9, considering all the places these digits show up in one form or another, which is the most frequently occurring digit? Assign probabilities of occurrence to each digit for bonus points. Don't forget to include in your calculations the fact that I used both 0 and 9 twice in this post.
by timonan
Mon Jun 01, 2009 9:28 pm UTC
Forum: Logic Puzzles
Topic: False positives
Replies: 15
Views: 2636

False positives

You are in a low-risk group for HIV where 1 out of 10,000 people have the virus. You are given an HIV test that is 99.9% accurate. You test positive. What are the chances that you actually have the disease?
by timonan
Mon Jun 01, 2009 9:20 pm UTC
Forum: Mathematics
Topic: Path of a curve while driving
Replies: 2
Views: 838

Re: Path of a curve while driving

Excellent....thanks for the info. That's exactly what I was hoping for.
by timonan
Mon Jun 01, 2009 1:50 am UTC
Forum: Mathematics
Topic: Path of a curve while driving
Replies: 2
Views: 838

Path of a curve while driving

Random question. Today my truck was parked next to a wall (it was to my right) and I needed to head in the opposite direction. There was about the width of a two-way street to my left (it was a wide alley), not enough space to just go forward and do a u-turn. I could have started forward and just do...
by timonan
Tue May 19, 2009 10:47 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 53197

Re: Meta Forum Game

Post that makes no reference to meta.
by timonan
Mon May 18, 2009 1:38 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 53197

Re: Meta Forum Game

Sudden realization that posts regarding the meta-nature of this game don't make any sense, as the players in the game have no knowledge of the meta-ness.
by timonan
Sat May 16, 2009 1:18 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 53197

Re: Meta Forum Game

While no one is paying attention, return to the game and racking up of a ton of points.
by timonan
Wed May 13, 2009 6:39 am UTC
Forum: Language/Linguistics
Topic: Make a word from the state abbreviations
Replies: 11
Views: 6124

Re: Make a word from the state abbreviations

One more...mainland.
by timonan
Wed May 13, 2009 1:39 am UTC
Forum: Language/Linguistics
Topic: Make a word from the state abbreviations
Replies: 11
Views: 6124

Re: Make a word from the state abbreviations

Calamari...very nice...first 8-letter.

Calamine is another.
by timonan
Wed May 13, 2009 1:04 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 53197

Re: Meta Forum Game

Throws a fit.
by timonan
Tue May 12, 2009 10:43 pm UTC
Forum: Language/Linguistics
Topic: Make a word from the state abbreviations
Replies: 11
Views: 6124

Re: Make a word from the state abbreviations

Post the abbreviations so we know what we have to work with. AL AK AZ AR CA CO CT DE FL GA HI ID IL IN IA KS KY LA ME MD MA MI MN MS MO MT NE NV NH NJ NM NY NC ND OH OK OR PA RI SC SD TN TX UT VT VA WA WV WI WY Add DC if you're feeling frisky. I'm sure of all but the last one, I've never had to use...
by timonan
Tue May 12, 2009 10:02 pm UTC
Forum: Language/Linguistics
Topic: Make a word from the state abbreviations
Replies: 11
Views: 6124

Re: Make a word from the state abbreviations

Hmm...no takers. Ok, two more six-letter words: arcade (Arkansas, California, and Delaware) and modems (Missouri, Delaware, and Mississippi).

Challenge: find an eight-letter word.
by timonan
Tue May 12, 2009 7:58 pm UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 53197

Re: Meta Forum Game

Makes a multiple meta comment that clearly disproves previous poster's theory. Continues by providing detailed schematics to a perpetual motion machine powered by the dreams of unicorns. For good measure, makes multiple meta comment about the perpetual motion machine powered by the dreams of unicorn...

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