Search found 190 matches

by parallax
Thu Jul 12, 2007 6:52 pm UTC
Forum: Science
Topic: Primary colours.
Replies: 78
Views: 9509

The human brain is much more flexible and resilient than you imagine.
by parallax
Thu Jul 12, 2007 3:12 am UTC
Forum: Science
Topic: "Water is not compressible, you cant sqeeze water...&qu
Replies: 47
Views: 15136

Volume is the spatial extent of an object. Mass is the object's resistance to change and gravitational charge. The two are unrelated. It is true that for most macroscopic objects, mass is proportional to volume. Electrons and other fundamental particles are generally treated as points, and don't hav...
by parallax
Thu Jul 12, 2007 1:31 am UTC
Forum: General
Topic: Words that are a noun, verb and adjective?
Replies: 55
Views: 7102

http://achewood.com/index.php?date=07062007 "Lyle says that Chris can use the F-word as any part of speech, if he's tired enough and his bank account is low" "Wow! Mr Bear says that last week Chris used the F-word as a "coordinating conjunction" which is really rare! His ba...
by parallax
Thu Jul 12, 2007 12:27 am UTC
Forum: Forum Games
Topic: Five letters
Replies: 1346
Views: 117291

A jar holds the eyeballs.

D E L A Y
by parallax
Thu Jul 12, 2007 12:23 am UTC
Forum: Forum Games
Topic: Maybe even more fun than making big numbers
Replies: 14
Views: 5788

Canceling the X's, you get sin(2X)/X = sin 2, which is obviously "Making for yourself an idol, whether in the form of anything that is in heaven above, or that is on the earth beneath, or that is in the water under the earth."
by parallax
Thu Jul 12, 2007 12:00 am UTC
Forum: Forum Games
Topic: Maybe even more fun than making big numbers
Replies: 14
Views: 5788

sin(2X)/X = (sin2)X/X, by associate law.
(sin2)X/X = (2sin)X/X, by commutative law.
(2sin)X/X = (2sin)1, by multiplicative inverse law.
(2sin)1 = 2(sin1), by associative law.
2(sin1) = 2(1), 1 is positive, so it's sign is +1.
2(1) = 2. Multiplication.
by parallax
Wed Jul 11, 2007 11:10 pm UTC
Forum: Science
Topic: "Water is not compressible, you cant sqeeze water...&qu
Replies: 47
Views: 15136

Stephen Hawking


To clarify, black holes cannot be compressed. They do become smaller as they naturally decay. However, decay is not compression.
by parallax
Wed Jul 11, 2007 10:56 pm UTC
Forum: Science
Topic: "Water is not compressible, you cant sqeeze water...&qu
Replies: 47
Views: 15136

nice try quantum troll. But if an electron had no size, then it would also have no mass. And since electrons have mass, they therefore have volume (size). This is completely untrue. Since when does volume = mass? There are things that cannot be compressed. Black holes, for instance, cannot be made ...
by parallax
Wed Jul 11, 2007 10:43 pm UTC
Forum: Science
Topic: Question about degenerate, commuting operators in QM
Replies: 6
Views: 5415

I believe the discrepancy between the two ideas is this: Two commuting operators don't necessarily have the same set of eigenvalues such that eigen(A) = eigen(B), but they have at least one set of common eigenvalues such that C is a subset of both eigen(A) and eigen(B). For example, IBv = BIv for an...
by parallax
Wed Jul 11, 2007 9:58 pm UTC
Forum: Science
Topic: Primary colours.
Replies: 78
Views: 9509

I regularly try to imagine what the first colour after violet is (as little sense as that makes.) I've always been very interested in seeing colours I've never seen before. Another nonexistent color of note: Superluminous Yellow Superluminous Yellow : Yellow :: Red : Pink We never see it because th...
by parallax
Wed Jul 04, 2007 2:47 am UTC
Forum: Forum Games
Topic: Anagram game
Replies: 6
Views: 3223

Give a clue. There's thousands of possibilities with just that. So far (using every letter) I have about 50 (most of which are very similar). [edit] Hmm... are you sure the 'x' word starts with x? I can't think of any words at all that start with x that you can make. Even names. Um . . . "xkcd...
by parallax
Wed Jul 04, 2007 1:42 am UTC
Forum: Science
Topic: Pressure in a balloon
Replies: 44
Views: 13128

The volume is difficult but not impossible to work out, and you can derive the number of moles of air inside the balloon based on its weight, which is difficult but not impossible to calculate. I think it would be much harder to measure the elasticity of the rubber. Wouldn't that depend on the ballo...
by parallax
Wed Jul 04, 2007 12:51 am UTC
Forum: Gaming
Topic: Cool games on the interweb
Replies: 1035
Views: 203424

by parallax
Tue Jul 03, 2007 6:57 pm UTC
Forum: Science
Topic: Pressure in a balloon
Replies: 44
Views: 13128

You can't just put the balloon directly in the water, because the water pressure will compress the balloon, changing its volume. Air doesn't really get "displaced". I suppose you could use some sort of airlock and measure the increase in air pressure when the balloon is introduced, but tha...
by parallax
Tue Jul 03, 2007 4:07 pm UTC
Forum: Science
Topic: Pressure in a balloon
Replies: 44
Views: 13128

What's a good way to measure the volume of the balloon?
by parallax
Tue Jul 03, 2007 2:19 pm UTC
Forum: Mathematics
Topic: a number game
Replies: 21
Views: 4302

There is no optimum pure strategy. If everyone picks the same number every time, you can win by defecting to a slightly lower number.
by parallax
Tue Jul 03, 2007 2:13 pm UTC
Forum: Mathematics
Topic: Sizes of infinite sets, also calculating Godel numbers
Replies: 15
Views: 4024

The problem with those definitions is that infinite sets can be put into one-to-one correspondence with their own subsets. You could end up concluding that set A was bigger than itself. For the Godel word problem, I'd probably just use the word "cab" or another similar word with letters fr...
by parallax
Fri Jun 29, 2007 3:52 am UTC
Forum: Science
Topic: Question about heavy and light falling objects
Replies: 30
Views: 4922

A bowling ball and a softball will both start accelerating at the same speed due to Earth's gravity. The only difference is that the bowling ball will pull the Earth towards it slightly (very slightly) faster than the softball will.
by parallax
Mon Jun 25, 2007 7:58 pm UTC
Forum: Forum Games
Topic: One word at a time
Replies: 276
Views: 41407

Once or twice in a life-time, there comes a time...a moment when everything becomes clear. I've always known mine: It starts with "A" and it ends with something that tastes like rotten tuna, but I actually believe that if everything tasted better than delicate anglerfish, Earth would becom...
by parallax
Mon Jun 25, 2007 6:36 pm UTC
Forum: Mathematics
Topic: Division by Zero (Please, no new threads about this)
Replies: 367
Views: 85105

It should be noted that 1/0 is undefined even in the limit sense. Mathematicians say "The limit is infinity." as a shorthand for "The limit is undefined and unbounded."
by parallax
Mon Jun 25, 2007 6:13 pm UTC
Forum: Science
Topic: Shaken Up Pop Cans
Replies: 12
Views: 3644

Not the top, but the side. The point is to get the bubbles that have collected on the sides of the can to go to the top, where there is no liquid blocking their escape. That way there won't be any liquid that has to get out of the way (read: explode out the top) due to the expanding volume of the g...
by parallax
Mon Jun 25, 2007 6:02 pm UTC
Forum: Forum Games
Topic: One word at a time
Replies: 276
Views: 41407

Once or twice in a life-time, there comes a time...a moment when everything becomes clear. I've always known mine: It starts with "A" and it ends with something that tastes like rotten tuna, but I actually believe that if everything tasted better than delicate anglerfish, Earth would becom...
by parallax
Mon Jun 25, 2007 5:37 pm UTC
Forum: Science
Topic: Physics question
Replies: 22
Views: 4944

The idea that every action must be caused by a prior action is flawed. Virtual particles are continuously spawned in vacuum fluctuations. The analogy I like to use to solve the "What happened before the beginning of time?" question is this: The beginning of time is like the north pole. The...
by parallax
Mon Jun 25, 2007 5:18 pm UTC
Forum: Science
Topic: Shaken Up Pop Cans
Replies: 12
Views: 3644

Well, the can will return to equilibrium given time. Keeping the can cold could speed up the process by redissolving the carbon dioxide faster.
by parallax
Sat Jun 23, 2007 3:00 pm UTC
Forum: Serious Business
Topic: Asexuality
Replies: 330
Views: 75211

I imagine many asexuals feel the same way about intimacy with another person as most straight people feel about intimacy with another person of their gender.
by parallax
Thu Jun 21, 2007 1:19 am UTC
Forum: Logic Puzzles
Topic: How do you save your father?
Replies: 43
Views: 9082

Are we to assume the father will die instantly if he is unsupported rather than slowly strangle to death?
by parallax
Sun Jun 17, 2007 9:57 pm UTC
Forum: Forum Games
Topic: Picture Pwn4ge!
Replies: 8368
Views: 1225839

Image
by parallax
Fri Jun 15, 2007 2:25 pm UTC
Forum: Forum Games
Topic: Corrupt-a-wish
Replies: 26091
Views: 2544515

spectacu-awesome wrote:I wish people wouldn't repeat wishes.


Granted:

I wish wishes wouldn't be repeated.
by parallax
Fri Jun 15, 2007 1:55 pm UTC
Forum: Mathematics
Topic: What's your favourite irrational number?
Replies: 78
Views: 22825

OmnipotentEntity wrote:Area of the Mandelbrot set, assuming it's irrational.


The area of the boundary of the Mandelbrot set, assuming it's nonzero and irrational.
by parallax
Fri May 25, 2007 5:25 am UTC
Forum: Science
Topic: Non-existing physical constructs
Replies: 198
Views: 31933

Macbi wrote:A bottomless pit. Preferably without air resistance.


"When you fall in a bottomless pit, you die of starvation."

"Little help down here?... Maybe some Lunchables?... Or a juice box?... "
by parallax
Thu May 17, 2007 6:07 am UTC
Forum: Science
Topic: Non-existing physical constructs
Replies: 198
Views: 31933

An island full of perfect logicians.
by parallax
Thu May 17, 2007 6:05 am UTC
Forum: Forum Games
Topic: Non-Sequitur Showdown.
Replies: 4342
Views: 552334

If I could only find my polar bear . . .
by parallax
Wed May 16, 2007 9:01 pm UTC
Forum: Coding
Topic: OMGWTF programming contest
Replies: 41
Views: 12511

I finally figured out a possible algorithm for adding numbers in prime-factor representation, but the contest is over now. :(
by parallax
Wed May 16, 2007 8:45 pm UTC
Forum: Mathematics
Topic: defining a number as "real"
Replies: 58
Views: 13444

A "real" number is simply any number that's useful to think about. This probably includes all the integers and rationals, as well as all the algebraic numbers. By necessity, it would also include pi and e, and any other transcendental numbers that play a specific role in mathematics. You c...
by parallax
Wed May 16, 2007 8:12 pm UTC
Forum: Science
Topic: [Physics] Electromagnet paradox
Replies: 17
Views: 5470

The answers so far that seem the most plausible to me are the magnetic field carrying off momentum (but wouldn't it be symmetric?) and the idea that without instantaneous-action-at-a-distance, we have to throw out Newton's third law (I thought it still applied?). If the iron starts accelerating bef...
by parallax
Tue May 15, 2007 8:01 pm UTC
Forum: General
Topic: Would you believe the news if it told you aliens were here?
Replies: 35
Views: 6654

spacermase wrote:Depends on said aliens, said aliens' form of transportation, and essentially if they looked like something that was plausible.

However, I'm something of an optimist, so my first inclination would be to believe.


Wouldn't believing that aliens are invading our planet make you a pessimist?
by parallax
Tue May 15, 2007 7:54 pm UTC
Forum: Mathematics
Topic: defining a number as "real"
Replies: 58
Views: 13444

You can define the reals as infinite decimal expansions if you exclude numbers that end in all 9s.
by parallax
Sun May 13, 2007 10:17 pm UTC
Forum: Science
Topic: [Physics] Electromagnet paradox
Replies: 17
Views: 5470

The magnetic field has momentum as well, which should cancel out the difference in momentum of the two objects.
by parallax
Sun May 13, 2007 1:38 pm UTC
Forum: Science
Topic: [Physics] Electromagnet paradox
Replies: 17
Views: 5470

Magnets are attracted to iron by the same force that iron is attracted to magnets. It's Newton's third law.
by parallax
Thu May 10, 2007 7:49 pm UTC
Forum: Science
Topic: [Physics] Blue shifting at 1/2 speed of light.
Replies: 11
Views: 5167

hotaru wrote:
One feature of the formula is that no summation of velocities ever exceeds the speed of light.

really?


No summation of velocities ever exceeds the speed of light assuming the velocities being summed are themselves less than the speed of light.

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