EnderSword wrote:It's not super hard to find out, but you'd have to know the resistance of the air.

Seems to be about 4 x 10^13 ohm meters at sea level for clear, fair-weather air.

- Fri Jul 31, 2009 4:52 pm UTC
- Forum: Science
- Topic: Firing a bullet from a train
- Replies:
**66** - Views:
**5858**

EnderSword wrote:It's not super hard to find out, but you'd have to know the resistance of the air.

Seems to be about 4 x 10^13 ohm meters at sea level for clear, fair-weather air.

- Sun Jul 26, 2009 7:09 am UTC
- Forum: Religious Wars
- Topic: Least Epic Religious War?
- Replies:
**87** - Views:
**17340**

Dr. Pepper: Bottled by Coca-cola bottlers vs. bottled by Pepsi bottlers.

- Sun Jul 26, 2009 6:31 am UTC
- Forum: Computer Science
- Topic: Wedding ring inscription
- Replies:
**43** - Views:
**8731**

janusmccarthy wrote:00110011 00111000

<3

You mean 00111100 00110011 ?

- Sat Jul 25, 2009 2:04 am UTC
- Forum: Mathematics
- Topic: Encoding a book onto a meterstick
- Replies:
**14** - Views:
**1832**

So, theoretically (ignoring subatomic stuff), would that point only represent one string of characters? Could it represent a different string that has a different amount of characters? There are 36 6.4 distinct markings you could make. You could have one mark represent the Bible, a different mark t...

- Fri Jul 24, 2009 5:40 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 0451: "Impostor"
- Replies:
**381** - Views:
**97123**

- Thu Jul 23, 2009 6:40 am UTC
- Forum: News & Articles
- Topic: Reading into Twilight
- Replies:
**137** - Views:
**10704**

Bella is the main character of the story, but I'll bet you don't know her last name

Is it Lugosi?

- Mon Jul 13, 2009 12:24 am UTC
- Forum: Language/Linguistics
- Topic: words you know exist but you wonder why.
- Replies:
**102** - Views:
**15982**

Closer to the topic, can someone please give me one good reason why we need specific names for most phobias? A few phobias certainly have descriptive power, but is anyone really going to use triskaidekaphobia (let alone its sibling, paraskavedekatriaphobia) as opposed to an English description of t...

- Sun Jul 12, 2009 1:11 am UTC
- Forum: News & Articles
- Topic: TIMES SQ. COPS VS. SUPER HEROES
- Replies:
**17** - Views:
**1585**

The Reaper wrote:Vaniver wrote:The number of things a person needs a license to do is worrying.

Sir, I'm afraid you're going to need a license for that worrying.

Excuse me, could you show me your license-enforcement license?

- Thu Jul 09, 2009 8:28 pm UTC
- Forum: News & Articles
- Topic: Black kids kicked out of pool in Philly
- Replies:
**55** - Views:
**5855**

EsotericWombat wrote:And seeing as you can't open up a storefront and put a "whites only" sign in front of it?

Unless it's a laundromat.

- Mon Jul 06, 2009 11:37 pm UTC
- Forum: Language/Linguistics
- Topic: "off of"
- Replies:
**80** - Views:
**12349**

Quincunx wrote:"off of" sounds silly unless you pronounce it right. i.e., 'awf ov'. In the same way one says 'there is not enough room in the room' with the first oo pronounced as in 'good', and the second as in 'doom'.

I'd pronounce them both as in "doom".

- Sun Jul 05, 2009 4:28 am UTC
- Forum: Mathematics
- Topic: 0/0 Debate
- Replies:
**13** - Views:
**1922**

When x = 0, both x/x and x^{2}/x are 0/0.

But, lim_{x -> 0} x/x = 1 and lim_{x -> 0} x^{2}/x = 0

But, lim

- Sat Jun 27, 2009 7:47 pm UTC
- Forum: Mathematics
- Topic: Geometry question- Chords (or quadrilaterals)
- Replies:
**4** - Views:
**606**

xkcd: Helping people answer their own questions since 1956.

- Mon Jun 22, 2009 11:01 pm UTC
- Forum: News & Articles
- Topic: ASCAP wants to be paid when your phone rings.
- Replies:
**12** - Views:
**1773**

http://www.eff.org/deeplinks/2009/06/ascap-wants-be-paid- ASCAP (the same folks who went after Girl Scouts for singing around a campfire) appears to believe that every time your musical ringtone rings in public, you're violating copyright law by "publicly performing" it without...

- Sun Jun 21, 2009 10:25 pm UTC
- Forum: Religious Wars
- Topic: Coding Fonts
- Replies:
**117** - Views:
**29104**

EXPERT PROGRAMMERS use wingdings.

- Sat Jun 20, 2009 4:57 am UTC
- Forum: Science
- Topic: Speed bump generators
- Replies:
**13** - Views:
**1806**

Zhatt wrote:What about hybrid cars? The breaking power that would normally be used to charge the batteries is now being stolen by this device because now you need to break less.

Wouldn't breaking less be a good thing? Repair shops can be so expensive nowadays.

- Thu Jun 18, 2009 6:26 am UTC
- Forum: Language/Linguistics
- Topic: Words that you are sure exist, but can't find
- Replies:
**225** - Views:
**81790**

Continuing the tales of woe...I got marked down in a paper once for using the less common meaning of 'saw' ?? What is the less common meaning? I was wondering if it may be to use a saw (the tool) upon something, but I can't see how a teacher could have marked them down unless they used it in an obv...

- Thu Jun 18, 2009 6:11 am UTC
- Forum: Mathematics
- Topic: Real-world examples of -x * -y = +z
- Replies:
**66** - Views:
**7482**

-(-12) 12 This is the step we're discussing. I don't see the relevance of the other stuff you wrote; it's neither a proof nor an intuition, since it depends on a quirk of notation. I sort of skipped a step there. Rather thinking of -(-12) as (-1)(-12), think of it as 0 - (-12). Subtracting a negati...

- Tue Jun 16, 2009 5:58 am UTC
- Forum: Science
- Topic: Football (US) Physics
- Replies:
**20** - Views:
**2565**

tbone694 wrote:with respect to to the ground

- Tue Jun 16, 2009 3:23 am UTC
- Forum: Mathematics
- Topic: Real-world examples of -x * -y = +z
- Replies:
**66** - Views:
**7482**

One thing I noticed is that adding a zero onto the left of a number (or right, if you have a decimal point) does not change a number's value. For example, 4 = 04 (and 4.9 = 4.90 (unless you're a scientist)). The same applies to negative numbers, as -4 = 0-4. Therefore you can treat negative numbers ...

- Fri Jun 12, 2009 6:22 am UTC
- Forum: Language/Linguistics
- Topic: Words that you are sure exist, but can't find
- Replies:
**225** - Views:
**81790**

- Fri Jun 12, 2009 4:51 am UTC
- Forum: Science
- Topic: Where do mad scientists hang out?
- Replies:
**20** - Views:
**2971**

mamerong wrote:They're mostly mad engineers, if you think about it.

No, the mad engineers build self-assembling automatic sentry guns and ammo dispensers, usually using any available scrap metal. Mad scientists build doomsday devices.

- Sun Jun 07, 2009 8:25 am UTC
- Forum: Science
- Topic: Homemade pepper spray? (Among other chemical weapons)
- Replies:
**5** - Views:
**2222**

Tobasco sauce + water + spray bottle?

- Sun May 31, 2009 1:16 am UTC
- Forum: Science
- Topic: The First Self-Replicator?
- Replies:
**10** - Views:
**1598**

Proteins are as 1-D as DNA is, being a straight line sequence of amino acids that is just tangled up in 3D space. They're like a tangled knot of string.

- Fri May 22, 2009 5:46 am UTC
- Forum: Science
- Topic: Have you ever wished a particular theory didn't work?
- Replies:
**59** - Views:
**5479**

I wonder what it'd be like to live in a world without causality. I suppose it'd be like trying to determine the order of cars driving around in an infinite parking lot instead of on an infinite one-way highway.

- Fri May 22, 2009 12:42 am UTC
- Forum: Mathematics
- Topic: My friend thinks that you can divide by zero.
- Replies:
**35** - Views:
**5064**

If 1/0 = \infty , then \infty\times0 = 1 (this is the definition of division). So: \begin{eqnarray} 0+0 & = & 0 \\ \infty\times(0+0) & = & \infty\times0 \\ \infty\times0 + \infty\times0 & = & \infty\times0 \\ 1 + 1 & = & 1 \\ 2 & = & 1 \end{eqnarray} ...

- Thu May 21, 2009 6:09 pm UTC
- Forum: Mathematics
- Topic: My friend thinks that you can divide by zero.
- Replies:
**35** - Views:
**5064**

Just use that to prove that 2 = 1. If that doesn't work then you're friend is beyond help. That only works if 0/0 = 1, not if 1/0 = \infty . a = b = 1 a = b ab = b^2 ab - a^2 = b^2 - a^2 a(b - a) = (b + a)(b - a) The next step is to divide both sides by (b - a), leaving a = b + a, but that doesn't ...

- Fri May 15, 2009 6:49 am UTC
- Forum: Language/Linguistics
- Topic: expressions/turns of phrase tha you love . . . share the joy
- Replies:
**52** - Views:
**6690**

I used to dislike "the exception that proves the rule" until I knew what it meant (if there weren't a rule, you wouldn't have to make an exception).

- Sun May 03, 2009 6:01 am UTC
- Forum: Language/Linguistics
- Topic: Euphemisms
- Replies:
**55** - Views:
**7246**

Bobber wrote:I was watching Soylent Green when I heard another one: locate as a euphemism for find. "I can't locate it!" really just means "I can't find it!" in most cases - saying locate just makes you sound less senile.

That's a synonym, not a euphemism.

- Fri Apr 17, 2009 3:50 am UTC
- Forum: Mathematics
- Topic: Definition of algebraic number
- Replies:
**16** - Views:
**1429**

Hackfleischkannibale wrote:strawberries are nuts

I think a better comparison would be saying that oranges are berries.

- Tue Mar 17, 2009 11:22 pm UTC
- Forum: Mathematics
- Topic: Irrational numbers don't exist
- Replies:
**51** - Views:
**5865**

chapel wrote:To paraphrase Douglas Adams: If you manage to convince yourself that black is white, you kill yourself at the first zebra that walks by.

Just to clarify, the exact quote is "[Man] goes on to prove that black is white and gets himself killed at the next zebra crossing."

- Tue Feb 24, 2009 1:12 am UTC
- Forum: Mathematics
- Topic: Homework: I am stuck regarding Geometric Mean in Triangles
- Replies:
**11** - Views:
**842**

Internetmeme wrote:I can't use the Quadratic Formula, because the 36 would become negative moving it over to make the equation equal to zero, or can I?

You can.

- Sat Dec 20, 2008 5:34 am UTC
- Forum: Mathematics
- Topic: On the capabilities of functions
- Replies:
**25** - Views:
**2573**

MartianInvader wrote:If you don't like sin(x) but you're okay with imaginary numbers, you could always try e^{ix} - e^{-ix}... don't worry, it always gives you a real answer. Heh heh heh.

That should be [imath]e^{ix}+e^{-ix}[/imath]

- Mon Dec 15, 2008 12:41 am UTC
- Forum: Science
- Topic: Resistance and potentiometers
- Replies:
**2** - Views:
**741**

You can't talk about scientific theories lacking scientific education without mentioning Neal Adams and his expanding earth theory . I've had a (nominally) similar idea that, because gravity is acceleration, perhaps the Earth is actually expanding outward at 9.81 m/s. Of course, this would imply th...

- Sun Oct 26, 2008 7:01 pm UTC
- Forum: Gaming
- Topic: You gotta get into Dwarf Fortress if you haven't already.
- Replies:
**4583** - Views:
**643446**

Awia wrote:What do I do with a lone art_image-10.dat file when I download a save, I can't for the life of me get it to work.

I believe you can do exactly nothing with just that.

- Mon Oct 20, 2008 3:11 am UTC
- Forum: Mathematics
- Topic: Trig functions, derivation, and calc homework
- Replies:
**5** - Views:
**1044**

Ah, I get it now. Still, it kinda seems like they just pulled that out of nowhere.

- Mon Oct 20, 2008 1:54 am UTC
- Forum: Mathematics
- Topic: Trig functions, derivation, and calc homework
- Replies:
**5** - Views:
**1044**

One problem in my AP Calc homework is as follows: tan y = x Find dy/dx implicitly and find the largest interval of the form -a < y < a such that y is a differentiable function of x. Then express dy/dx as a function of x. So I got dy/dx = cos 2 y Interval is -pi/2 < y < pi/2 y = tan -1 x, so dy/dx = ...

- Sat Oct 04, 2008 3:13 am UTC
- Forum: Mathematics
- Topic: University Calculus Bonus Problem
- Replies:
**16** - Views:
**2059**

Assuming that Alice and Bob each get the piece the other didn't pick, I'd say the maximum cake Alice can get is 1.9999, as she cuts an infinitesimal slice off of each cake and Bob, not wanting any cake to begin with, takes the 0.0000001 slice of cake.

- Fri Sep 26, 2008 11:51 pm UTC
- Forum: Science
- Topic: Total energy of an ideal fluid in a pipe...
- Replies:
**11** - Views:
**1040**

I believe the energy goes into pushing the fluid in front of it further down the pipe.

- Tue Sep 16, 2008 2:34 am UTC
- Forum: Mathematics
- Topic: Divisibility rules
- Replies:
**6** - Views:
**2246**

I was wondering to myself the other day, "How come if you add up all the digits in a (base 10) number, you can tell if it's divisible by 3 or 9?" So I did some thinking about it and came up with these: Simple divisibility rules for a whole number x in base n. (n being a positive integer): ...