## Search found 126 matches

Sat Mar 30, 2019 9:00 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2934
Views: 701310

### Re: Miscellaneous Science Questions

There is only a countably infinite amount of numbers with two representations, and the whole thing is fixable, but it needs to be fixed if you want your bijection. And after the fix, your bijection will be a lot less beautiful and a lot less simple to use for further proofs. Can't you just start by...
Fri Oct 26, 2018 12:27 pm UTC
Topic: 2063: "Carnot Cycle"
Replies: 27
Views: 6329

### Re: 2063: "Carnot Cycle"

Archgeek wrote:
Flumble wrote:Either way I care not: I'm driving a huge ass-truck, not a car.

Is this a truck loaded with butts, or donkeys? Or is it a truck in the shape of a donkey, or that of a butt?

Ass-trucks are for hauling ass.
Fri Aug 03, 2018 1:56 pm UTC
Forum: Mathematics
Topic: Terminology Question: Percentile vs Percentile Rank
Replies: 9
Views: 4170

### Re: Terminology Question: Percentile vs Percentile Rank

It looks like the percentile rank is the percentage of values that are below a score (so, just a number), while the percentile is the group of all of the values that are below a given percentile rank. If your mass is at the 89th percentile (89% of the population has less mass than you), then the pe...
Mon Jul 16, 2018 9:52 pm UTC
Topic: 2020: "Negative Results"
Replies: 15
Views: 3378

### Re: 2020: "Negative Results"

Found one :
Sun Jan 28, 2018 2:33 pm UTC
Forum: Mathematics
Topic: Elevator problem
Replies: 14
Views: 6205

### Re: Elevator problem

The pick 5 from 21 thing, all likely, with the bias that you can only goes down from 23 to 1, so each level passed without stopping is eliminated. In how many different ways can you choose 5 elements from a set of 21 (23 floors minus the 23rd where you start and the 1st where you end = 21)? How man...
Mon Jan 15, 2018 8:55 pm UTC
Forum: News & Articles
Topic: Winfrey presidency
Replies: 156
Views: 42432

### Re: Winfrey presidency

Now for a TV broadcast the likes of "Dr. Phil" and Dr. Oz." make for great television and if your a daytime television show (including the bit abut getting advertisers to fund it) then they're ideal. Even someone fully capable of choosing competent advisors for the position of presid...
Thu Jan 11, 2018 7:14 pm UTC
Topic: Trolley Problem
Replies: 349
Views: 114484

### Re: Trolley Problem

CorruptUser wrote:I cant view videos at the moment. Did most people switch or not?

From what I remember, 2 flipped the switch, and 5-6 either froze or elected to not flip.
Wed Jan 10, 2018 10:18 pm UTC
Topic: 1940: "The Food Size Cycle"
Replies: 52
Views: 10256

### Re: 1940: "The Food Size Cycle"

somitomi wrote:
Hiferator wrote:But yes, some phablets are ridiculous.

The word "phablet" itself is ridiculous.

I can't not see "phallic tablet". Now neither can you. You're welcome.
Wed Jan 10, 2018 10:09 pm UTC
Forum: Mathematics
Topic: PI - Invention or Discovery
Replies: 88
Views: 17207

### Re: PI - Invention or Discovery

Tub wrote:Your nose is a hole in your body for the ingress and egress of air. By definition, it's a vent. If you put your finger in there, you've also in-vented it.

I appreciate that you decided to post this. I really do.
Mon Jan 01, 2018 6:45 am UTC
Forum: Language/Linguistics
Topic: Is this logical statement true or false?
Replies: 15
Views: 6876

### Re: Is this logical statement true or false?

[O]ther "all / almost all" pairs may be true or false depending on other things about the world. In the case of "statements about the future" (and indeed most classes of statements) half are true and half are false since for every statement A that is false ~A is true and vice ve...
Sun Dec 31, 2017 8:50 pm UTC
Forum: Science
Topic: Multipath Crazy Straw
Replies: 24
Views: 5824

### Re: Multipath Crazy Straw

If you assign a "resistance" to each branch, you could calculate the fluid flow similarly to how you calculate electrical current flow in a resistor network. What about gravity? Gravity will affect the suction force required to operate the straw, but I don't know if it would affect the re...
Tue Dec 26, 2017 5:22 pm UTC
Forum: Science
Topic: Odd sunlight reflections off glass windows
Replies: 11
Views: 3715

### Re: Odd sunlight reflections off glass windows

Variations in air pressure could cause fairly uniform distortion for multiple windows... Do you think that the differences in temperature between the outside and inside could cause the differences in pressure? I was referring to a pressure difference between the atmospheric pressure (on both sides ...
Tue Dec 26, 2017 4:56 pm UTC
Forum: Science
Topic: Multipath Crazy Straw
Replies: 24
Views: 5824

### Re: Multipath Crazy Straw

If I made this what path would the fluid actually take? And something bad has got to happen with the 'g's, right? If you assign a "resistance" to each branch, you could calculate the fluid flow similarly to how you calculate electrical current flow in a resistor network. The flow is drive...
Fri Dec 22, 2017 5:38 pm UTC
Forum: Science
Topic: Odd sunlight reflections off glass windows
Replies: 11
Views: 3715

### Re: Odd sunlight reflections off glass windows

I assume it's something like that, but either all glass is like that (and I've just never had the opportunity to see it before), or there's something very odd about our street... If it is this effect, it would only be visible on surfaces at a range of distances determined by the focal length of the...
Fri Dec 22, 2017 4:31 pm UTC
Forum: Science
Topic: Odd sunlight reflections off glass windows
Replies: 11
Views: 3715

### Re: Odd sunlight reflections off glass windows

The attached picture shows the patterns created by sunlight being reflected off of windows behind the camera onto the walls of some flats that are being built on vacant land at the end of our garden. What am I seeing? I'm only showing a couple of the reflections here, but our house is part of a ter...
Wed Dec 20, 2017 6:38 pm UTC
Forum: Mathematics
Topic: Bump Function
Replies: 7
Views: 4646

### Re: Bump Function

Update: I am just looking at the function y = x 1/x for now. This function should have the same limit behavior near zero since for small x, a ≃ x and b a ≃ 1. The first derivative of this function y' = y*(1 - ln(x))/x^2. Let s = 1 - ln(x), and rearrange y' = y*[1/x 2 * s]. As Demki helpfully pointed...
Thu Dec 14, 2017 6:12 pm UTC
Forum: Mathematics
Topic: Bump Function
Replies: 7
Views: 4646

### Re: Bump Function

It’s also worth noting that your title doesn’t match your question, which is good because the title is impossible. A bump function can be infinitely differentiate, but it cannot be analytic. When I wrote the title, I thought "analytic" just meant that it consisted of compositions of "...
Thu Dec 14, 2017 3:17 pm UTC
Forum: Mathematics
Topic: Bump Function
Replies: 7
Views: 4646

### Re: Analytic Bump Function

At x=0, can you prove that your function… • is continuous? • is differentiable? • is twice-differentiable? What do you imagine a proof that it is infinitely-differentiable would look like? Iff it is continuous, the limits from the left and right sides of the transition points will exist and be iden...
Tue Dec 12, 2017 10:52 pm UTC
Forum: Mathematics
Topic: Bump Function
Replies: 7
Views: 4646

### Bump Function

Consider the function from R to R defined piecewise as follows:

Code: Select all

`a = x/(1-x)b = 1/af(x) = 0         | x ≤ 0f(x) = a^b * b^a | 0 < x < 1f(x) = 0         | x ≥ 1`

I believe that this function is infinitely differentiable at x=0 and x=1. How would I go about proving this?
Fri Dec 08, 2017 4:20 pm UTC
Topic: 1925: "Self-Driving Car Milestones"
Replies: 22
Views: 5684

### Re: 1925: "Self-Driving Car Milestones"

JGeezer wrote:Been quietly lurking for some time, but I had a dream where I was working on autonomous vehicles a week or two ago (really), and in it I said "Just say into here where you want to go, and it will take you somewhere that sounds vaguely like that".

"Diagonally!"
Wed Dec 06, 2017 1:24 pm UTC
Forum: Logic Puzzles
Topic: Escape the Frictionless Circle
Replies: 156
Views: 62141

### Re: Escape the Frictionless Circle

morriswalters wrote:Isn't this just a 2 body problem dressed up to look special? The rope is gravity and the rotation happens in the plane?

Similar. Except here the tension in the rope doesn't have a nice conservative function of distance like gravity does since the human can add energy to the system.
Fri Dec 01, 2017 5:49 pm UTC
Topic: 1923: "Felsius"
Replies: 78
Views: 11228

### Re: 1923: "Felsius"

Rombobjörn wrote:Great, now we'll have an unresolvable schism between users of "Felsius" and users of "Celsenheit".

"Felsiusenheit"
Mon Nov 27, 2017 5:32 pm UTC
Topic: 1920: "Emoji Sports"
Replies: 23
Views: 7188

### Re: 1920: "Emoji Sports"

stilettoblade wrote:I read the Consequence Archery as archery on a space station, so the consequence if you miss is that you'll die from decompression (I think the emojis are astronaut-bow&arrow-satellite)...

Yeah, that's more likely to be what RM was going for.
Sat Nov 25, 2017 2:49 pm UTC
Forum: Fictional Science
Topic: How do you define..."you"?: Question about Infinite Universe
Replies: 22
Views: 6866

### Re: How do you define..."you"?: Question about Infinite Universe

It must therefore be as if your universe is finite but unbounded (wrap-around) with everything repeated across the tile/wrap boundary 1 . Or else the next You over isn't quite You. And sufficiently so to make the original assumption moot, in the long-term. I don't think the OP was suggesting that t...
Fri Nov 24, 2017 5:56 pm UTC
Topic: 1920: "Emoji Sports"
Replies: 23
Views: 7188

### Re: 1920: "Emoji Sports"

I'm also curious about what consequence archery would be. Are you firing at satellites? Or from a satellite? I interpreted Consequence Archery as something like "failure to perform will result in consequences, which may include orbital death ray satellites". Similarly, Consequence Golf. I...
Wed Nov 22, 2017 12:48 pm UTC
Forum: News & Articles
Topic: In other news... (humorous news items)
Replies: 15136
Views: 2592909

### Re: In other news... (humorous news items)

elasto wrote:...dowsing...

I wonder if focusing on something right in front of you and walking around with no long-term directional goal makes you more likely than not to walk downhill (path of least resistance and all that). Could that be an improvement over a purely random walk for finding water?
Tue Nov 21, 2017 5:32 pm UTC
Forum: News & Articles
Topic: In other news... (humorous news items)
Replies: 15136
Views: 2592909

### Re: In other news... (humorous news items)

A law not backed by morality? How about the laws that used to require voters to be male? Or poll taxes and literacy tests. Or the laws legalizing slavery and the laws requiring people to turn in runaway slaves. Surely such laws were still argued for using moral language at the time. Whether they we...
Mon Nov 06, 2017 4:18 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 622
Views: 123625

### Re: Penetrate Earth

Why would a black hole move through the Earth, though? Are you just assuming it's so small and moving fast enough that it, what, sucks material up to get it out of the way or something? I'm not too sure why you think this doesn't just destroy the Earth outright and instead punches through. As I und...
Sun Oct 29, 2017 6:21 pm UTC
Forum: Language/Linguistics
Topic: Regional Dialect and Idiolect Oddities (pronunciation)
Replies: 944
Views: 274659

### Re: Regional Dialect and Idiolect Oddities (pronunciation)

How many syllables does "vehicle" have for people? I have two, first syllable rhyming with "deer" (couldn't find a rhyme for the first syllable that would work for rhotic speakers...). I don't think I've ever heard it pronounced with two syllables. I say /'vi.ɪ.kʊl/, and the onl...
Fri Oct 27, 2017 3:38 pm UTC
Forum: Mathematics
Topic: What is a Euclidean Number
Replies: 13
Views: 5002

### Re: What is a Euclidean Number

doogly wrote:I mean I carry an imaginary ruler with me everywhere I go, are you not likewise prepared?

Isn't that just two rulers stapled together at right angles?
Tue Oct 17, 2017 2:55 pm UTC
Forum: Language/Linguistics
Topic: Regional Dialect and Idiolect Oddities (pronunciation)
Replies: 944
Views: 274659

### Re: Regional Dialect and Idiolect Oddities (pronunciation)

I don't recall ever hearing "noir" pronounced.
Maybe I'm just not remembering it, or maybe I just need to get out more.
Thu Oct 12, 2017 4:02 pm UTC
Topic: 1900: "Jet Lag"
Replies: 29
Views: 6829

### Re: 1900: "Jet Lag"

Most Brits are familiar with the American language from movies and TV (or films and telly, as we call them), and are pretty much bilingual. But for some reason, it must be rare for people to discuss times in the movies, because it always confuses me when somebody says something like "five of s...
Mon Oct 02, 2017 9:06 pm UTC
Topic: 1896: "Active Ingredients Only"
Replies: 40
Views: 7390

### Re: 1896: "Active Ingredients Only"

snip But that isn't an incorrect belief. It is true that knowing that the pill is a placebo doesn't change how it affects you. It doesn't affect you. If you do get better anyways, it by definition isn't due to any ingredients in the pill, and almost certainly has nothing to do with the pill at all....
Mon Oct 02, 2017 8:52 pm UTC
Topic: 1896: "Active Ingredients Only"
Replies: 40
Views: 7390

### Re: 1896: "Active Ingredients Only"

Well, it doesn't work for me since I read that Wiki page; now it won't work for you either. Sorry. Fortunately knowing that it's a Placebo doesn't reduce it's effect. Sort of by definition, placebos don't "work" at all in the sense that you mean. I believe x7eggert was trying to solve the...
Fri Sep 29, 2017 6:11 pm UTC
Forum: Language/Linguistics
Topic: Regional Dialect and Idiolect Oddities (pronunciation)
Replies: 944
Views: 274659

### Re: Regional Dialect and Idiolect Oddities (pronunciation)

Eebster the Great wrote:
Mega85 wrote:How do you pronounce "trypophobia"?

I don't

How do you pronounce "violence" and "violent"? With two syllables or three syllables?

Two syllables. The o is silent for me.

Same here.
Wed Sep 27, 2017 3:00 pm UTC
Forum: Mathematics
Topic: A Set of Points
Replies: 2
Views: 2622

### Re: A Set of Points

Thanks notzeb! That's just what I was looking for. I figured some sort of complex analysis was the way to go here, but I'm not familiar enough with it to notice that congruence.
Tue Sep 26, 2017 8:45 pm UTC
Forum: Mathematics
Topic: A Set of Points
Replies: 2
Views: 2622

### A Set of Points

Consider the set of points in R 2 defined by the following construction rules: Rule 1: The points (0,0) and (1,0) are in the set. Rule 2: For any pair of points A and B in the set, the point created by rotating B 1/5 of a turn (2π/5) about A is also in the set. This is sufficient to create a minimal...
Mon Sep 11, 2017 8:03 pm UTC
Topic: How would you change the U.S. tax system?
Replies: 197
Views: 61120

### Re: How would you change the U.S. tax system?

If we change the current U.S. marginal tax system such that the first bracket is taxed at 15% and the second is taxed at 20%, then what is a function that gives the change in effective tax for a given income? Uh... the tax bracket itself? I'm not sure you're asking what you think you're asking. It ...
Mon Sep 11, 2017 4:52 pm UTC
Forum: Science
Topic: Stupid Science Q&A
Replies: 34
Views: 4976

### Re: Stupid Science Q&A

Someone I know wrote:It makes sense that there are a lot of hurricanes right now because it's near a full moon, and the moon causes the tides

...
Tue Sep 05, 2017 9:24 pm UTC
Forum: Logic Puzzles
Topic: 538 hats riddle
Replies: 20
Views: 7611

### Re: 538 hats riddle

With 7 people you can use two rules. Rule one - If you see four people with the same color, then you must guess that you have the opposite color. Win - 70/128 Lose - 42/128 Rule two - If you see six people with the same color, then you must guess that you have the opposite color Win - 14/128 Lose -...