## Search found 150 matches

Wed May 25, 2011 6:05 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0903: "Extended Mind"
Replies: 666
Views: 179519

### 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.
Tue Feb 08, 2011 7:10 am UTC
Forum: Mathematics
Topic: Question about a solid of revolution
Replies: 7
Views: 1156

### 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 ...
Mon Feb 07, 2011 7:29 pm UTC
Forum: Mathematics
Topic: Question about a solid of revolution
Replies: 7
Views: 1156

### 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.
Mon Feb 07, 2011 9:12 am UTC
Forum: Mathematics
Topic: Question about a solid of revolution
Replies: 7
Views: 1156

### 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...
Tue Sep 21, 2010 8:03 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 50772

### Re: Meta Forum Game

Deduction of 20 points given to every player for delay of game.
Mon Jul 19, 2010 8:03 am UTC
Forum: Mathematics
Topic: Hands of a clock
Replies: 9
Views: 1420

### 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...
Mon Jul 19, 2010 7:50 am UTC
Forum: Mathematics
Topic: Hands of a clock
Replies: 9
Views: 1420

### 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.
Mon Jul 19, 2010 7:28 am UTC
Forum: Mathematics
Topic: Hands of a clock
Replies: 9
Views: 1420

### 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 ...
Mon Jul 19, 2010 6:50 am UTC
Forum: Mathematics
Topic: Hands of a clock
Replies: 9
Views: 1420

### 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...
Sat Jul 10, 2010 1:25 am UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2927
Views: 692861

### 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...
Tue May 11, 2010 6:32 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 50772

### Re: Meta Forum Game

Long confused pause...................game resumes.
Mon May 10, 2010 9:03 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 50772

### Re: Meta Forum Game

Quick collection of points while everyone is ranting, though most is obtained through blatant cheating.
Sun May 09, 2010 2:40 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 50772

### Re: Meta Forum Game

Game is not returned to.
Sat May 08, 2010 9:09 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 50772

### 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.
Fri May 07, 2010 9:09 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 50772

### Re: Meta Forum Game

Reminder that there are only 2 days left in the bonus round.
Tue Nov 24, 2009 9:42 am UTC
Forum: Logic Puzzles
Topic: Only one number in the English Language...
Replies: 9
Views: 4576

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

How about e?
Fri Nov 06, 2009 6:56 am UTC
Forum: Music
Topic: Classical piano recommendations?
Replies: 12
Views: 2273

### Re: Classical piano recommendations?

Thanks for the recommendations. They all sound perfect for me. I'm working through Pathetique right now....wonderful.
Thu Oct 29, 2009 9:02 am UTC
Forum: General
Topic: The ax
Replies: 50
Views: 4355

### 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...
Sat Oct 10, 2009 8:03 pm UTC
Forum: Music
Topic: Classical piano recommendations?
Replies: 12
Views: 2273

### 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...
Sat Oct 10, 2009 10:08 am UTC
Forum: Music
Topic: Classical piano recommendations?
Replies: 12
Views: 2273

### 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...
Wed Aug 12, 2009 5:05 am UTC
Forum: Logic Puzzles
Topic: Letters
Replies: 5
Views: 1114

### 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.
Wed Aug 12, 2009 4:26 am UTC
Forum: Logic Puzzles
Topic: Letters
Replies: 5
Views: 1114

### Letters

What about the first letter suggests the second?

f - e
h - a
m - e
q - c
r - a
w - d
y - w
Mon Jul 20, 2009 9:28 pm UTC
Forum: Mathematics
Topic: Palindromic numbers
Replies: 17
Views: 2247

### 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...
Sat Jul 11, 2009 9:52 pm UTC
Forum: Logic Puzzles
Topic: Add some numbers
Replies: 5
Views: 1391

### 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.
Sat Jul 11, 2009 8:53 pm UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 50772

### Re: Meta Forum Game

Accidental erasing of everyone's scores.

Embarrassed laugh.

Halfhearted excuse that the posts were straying from the game anyway.
Fri Jun 05, 2009 1:05 am UTC
Forum: Mathematics
Topic: Most frequently occuring digit
Replies: 17
Views: 1810

### Re: Most frequently occuring digit

Or my speculation engine...reasoned imagination.
Thu Jun 04, 2009 9:15 pm UTC
Forum: Mathematics
Topic: Most frequently occuring digit
Replies: 17
Views: 1810

### 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...
Wed Jun 03, 2009 12:34 am UTC
Forum: Mathematics
Topic: Most frequently occuring digit
Replies: 17
Views: 1810

### 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.
Mon Jun 01, 2009 9:28 pm UTC
Forum: Logic Puzzles
Topic: False positives
Replies: 15
Views: 2579

### 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?
Mon Jun 01, 2009 9:20 pm UTC
Forum: Mathematics
Topic: Path of a curve while driving
Replies: 2
Views: 823

### Re: Path of a curve while driving

Excellent....thanks for the info. That's exactly what I was hoping for.
Mon Jun 01, 2009 1:50 am UTC
Forum: Mathematics
Topic: Path of a curve while driving
Replies: 2
Views: 823

### 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...
Tue May 19, 2009 10:47 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 50772

### Re: Meta Forum Game

Post that makes no reference to meta.
Mon May 18, 2009 1:38 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 50772

### 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.
Sat May 16, 2009 1:18 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 50772

### Re: Meta Forum Game

While no one is paying attention, return to the game and racking up of a ton of points.
Wed May 13, 2009 6:39 am UTC
Forum: Language/Linguistics
Topic: Make a word from the state abbreviations
Replies: 11
Views: 5955

### Re: Make a word from the state abbreviations

One more...mainland.
Wed May 13, 2009 1:39 am UTC
Forum: Language/Linguistics
Topic: Make a word from the state abbreviations
Replies: 11
Views: 5955

### Re: Make a word from the state abbreviations

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

Calamine is another.
Wed May 13, 2009 1:04 am UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 50772

### Re: Meta Forum Game

Throws a fit.
Tue May 12, 2009 10:43 pm UTC
Forum: Language/Linguistics
Topic: Make a word from the state abbreviations
Replies: 11
Views: 5955

### 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...
Tue May 12, 2009 10:02 pm UTC
Forum: Language/Linguistics
Topic: Make a word from the state abbreviations
Replies: 11
Views: 5955

### 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.
Tue May 12, 2009 7:58 pm UTC
Forum: Forum Games
Topic: Meta Forum Game
Replies: 353
Views: 50772

### 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...

Go to advanced search