Search found 74 matches

by Qwert
Thu Apr 26, 2012 6:23 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1047: "Approximations"
Replies: 159
Views: 70974

Re: 1047: "Approximations"

Another fun one:

1 AU ~= 499 light-seconds, accurate to 1 in a million.

Or more amusingly coincidental:

1AU ~= 500 ls to within 1 in 500
by Qwert
Tue Jan 03, 2012 8:00 am UTC
Forum: Science
Topic: Gravitons... wild goose chase?
Replies: 37
Views: 7368

Re: Gravitons... wild goose chase?

Per wiki: Unambiguous detection of individual gravitons, though not prohibited by any fundamental law, is impossible with any physically reasonable detector.[12] The reason is the extremely low cross section for the interaction of gravitons with matter. For example, a detector with the mass of Jupit...
by Qwert
Thu Oct 27, 2011 11:22 pm UTC
Forum: Fictional Science
Topic: Portals that don't allow you to create energy
Replies: 22
Views: 7231

Re: Portals that don't allow you to create energy

Free energy by using this system: http://i.imgur.com/GaDxp.png So long as the object falls from high enough (and through a vacuum) for the bi-directional heat engine to equalize the temperature differential between the portals, you will get a useful amount of work every time it passes through the po...
by Qwert
Thu Oct 27, 2011 6:25 am UTC
Forum: Fictional Science
Topic: Portals that don't allow you to create energy
Replies: 22
Views: 7231

Re: Portals that don't allow you to create energy

Alternatively, you can have the portal take energy from its surroundings cooling them if energy would be created and have it dump energy as light (or other radiation if energy would have gone walkies). This would mean that there would be sharp changes in temperature of the portal frame (the stuff a...
by Qwert
Wed Aug 10, 2011 6:55 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0936: "Password Strength"
Replies: 893
Views: 321359

Re: 0936: "Password Strength"

It really bugs me when admins set password requirements by character use. if I have a password like "i4teuynv894yo8jtdu7r" (~104 bits) it is more secure than "Password." (~59 bits), period and "P" be damned.
by Qwert
Fri Jun 10, 2011 4:19 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0910: "Permanence"
Replies: 121
Views: 34416

Re: 0910: "Permanence"

This reminds me of when I named my computer. I really should have consulted someone who knew Latin. I named it Machina Ex Deus, which, from what I understand, is just Deus Ex Machina with different emphasis. Anyone know how to say "the Machine from God"? I probably should have just called...
by Qwert
Thu May 26, 2011 7:25 am UTC
Forum: Gaming
Topic: Minecraft
Replies: 9442
Views: 1537068

Re: Minecraft

Patchnotes wrote:* Fixed minecarts next to each other causing extreme velocities (sorry!)


Image
by Qwert
Thu Apr 28, 2011 4:06 am UTC
Forum: Gaming
Topic: Portal 2 : Princess No-Knees 3 : Jump Harder
Replies: 833
Views: 174772

Re: Portal 2

You know the part where you have to cover part of one pillar with moon semen conversion gel, then put a portal on the side of that to make it go up higher onto the other pillar, and go back and forth like that for a few times ? I actually had to look that part up. Honestly, I spent like half an hou...
by Qwert
Mon Apr 04, 2011 8:40 pm UTC
Forum: Coding
Topic: Prank Code
Replies: 40
Views: 6686

Re: Prank Code

Today I was bored listen to the teacher rehash last class's algebra 2 lesson because half the class was too stupid to do the homework right, so I wrote the following on one of the school calculators and left it running: I did something similar, except it was to swap between RADIANS and DEGREES only...
by Qwert
Fri Mar 25, 2011 5:43 pm UTC
Forum: Science
Topic: Would a Relativistic Kill Vehicle work?
Replies: 78
Views: 10676

Re: Would a Relativistic Kill Vehicle work?

Two more things that make drag a mostly non-issue: We've already accelerated it to .99c, and the interstellar medium is just about as close to a perfect vacuum as we can get; since it could survive acceleration to .99c AND the drag it received while doing so, I think that drag wouldn't be a problem ...
by Qwert
Wed Mar 23, 2011 4:23 am UTC
Forum: Science
Topic: Would a Relativistic Kill Vehicle work?
Replies: 78
Views: 10676

Re: Would a Relativistic Kill Vehicle work?

Here's what I've never seen explained satisfactorily about the "RKV": If it's going so fast, why doesn't it just go straight through the planet? Everyone just does the calculations of how much energy it would be carrying and then says "that's sufficient to blow up everyone", com...
by Qwert
Mon Mar 21, 2011 4:28 am UTC
Forum: Gaming
Topic: Minecraft
Replies: 9442
Views: 1537068

Re: Minecraft

Wolves look cool! I would like the next update to fix redstone wires bending toward things they aren't truly connected to... and make them bend toward the input end of a repeater as if it was wire because I do not like having to give it an extra straight wire to connect. For example, if i have wire...
by Qwert
Sun Mar 20, 2011 7:00 am UTC
Forum: Science
Topic: failsafe features in fission reactors
Replies: 15
Views: 1960

Re: failsafe features in fission reactors

Also, the problem reactors have been seawater flooded, meaning they are functionally destroyed for power generation. This was why they had the explosions and such; they were trying to avoid flooding a finely tuned billion dollar piece of equipment with highly corrosive seawater, especially in light ...
by Qwert
Fri Mar 18, 2011 7:09 pm UTC
Forum: Gaming
Topic: Minecraft
Replies: 9442
Views: 1537068

Re: Minecraft

Dunno if it's quite what you want, but here's my flatgrass map with chests full of hacked in supplies.

http://dl.dropbox.com/u/1861575/Flatgrass.zip
by Qwert
Tue Mar 15, 2011 7:15 pm UTC
Forum: Gaming
Topic: Minecraft
Replies: 9442
Views: 1537068

Re: Minecraft

So... has there been update on the game? Because I think there is an increase in slime production, this is the first time I've seen so many slimes... Also, holy hell, I have a tiny little 3x4x1 water breaking pit near bedrock at the bottom of my chain and two squid have spawned in it. It's hilariou...
by Qwert
Sat Mar 12, 2011 9:46 pm UTC
Forum: Gaming
Topic: Minecraft
Replies: 9442
Views: 1537068

Re: Minecraft

Thankfully he literally can't do any more than the last greifer. Kind of pathetic that he's trying really.
by Qwert
Sat Mar 12, 2011 9:36 am UTC
Forum: Gaming
Topic: Minecraft
Replies: 9442
Views: 1537068

Re: Minecraft

That depends on Psion.

Replaced most of the path and replanted 2 and a half forests, but that was LOT of wood destroyed.
Left a full log stack in the bank, as well as some wool and dye.

Near as I can tell, if it had wood it's gone, if it didn't its untouched.

Man this sucks :(
by Qwert
Mon Feb 28, 2011 4:01 am UTC
Forum: Gaming
Topic: Minecraft
Replies: 9442
Views: 1537068

Re: Minecraft

So I am on psions server (btw love it very good connectivity) and i dig straight down till i hit bedrock and find some diamond then i start running into a weird problem. I'm mining the stone and its coming back as dirt or iron and other things. When i spam torches near these areas it reveals what t...
by Qwert
Sat Feb 19, 2011 10:32 pm UTC
Forum: Science
Topic: Magnetic pendulum
Replies: 33
Views: 4759

Re: Magnetic pendulum

All the magnets do is add more potential energy (distance between the magnets) and more 'weight' (the magnetic force) into the system, functionally identical to gravity since they are both 1/R^2 forces. Since you know that increasing the weight or height does nothing to the period, why would adding ...
by Qwert
Wed Feb 16, 2011 5:32 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0861: "Wisdom Teeth"
Replies: 116
Views: 28352

Re: 0861: "Wisdom Teeth"

I apparently don't have wisdom teeth, so I guess this is one comic I can never "Randal get out of my head" to.
by Qwert
Tue Feb 01, 2011 5:45 pm UTC
Forum: Fictional Science
Topic: What fictional science is required for space-fighers?
Replies: 131
Views: 17962

Re: What fictional science is required for space-fighers?

I think fighters make sense if you are trying to use direct fire weapons like rail-guns, lasers, dumbfire missiles, etc, because (1) it allows for their use at ranges that disallows dodging and limits countermeasures, and (2) allows more surface area from which to launch the weapons. A big warship c...
by Qwert
Mon Jan 17, 2011 9:58 pm UTC
Forum: Science
Topic: Black Hole Sun, Won't You Come?
Replies: 31
Views: 3388

Re: Black Hole Sun, Won't You Come?

If you're hovering above the event horizon, you can just travel all the way around the circumference of the black hole (moving perpendicular to your thrust), measuring the distance as you go. When you get back to your starting point, divide by 2pi and now you know your Schwarzschild radius. From th...
by Qwert
Fri Jan 14, 2011 2:15 am UTC
Forum: Science
Topic: Black Hole Sun, Won't You Come?
Replies: 31
Views: 3388

Re: Black Hole Sun, Won't You Come?

letterX wrote:
zaybu wrote:... as it is impossible to determine the location of the event horizon from local observations.


Really? I don't think I've ever heard that factoid before. Why not?

This sitehas a bunch of great animations and describes what everything means for the most part.
by Qwert
Tue Jan 11, 2011 5:42 pm UTC
Forum: Mathematics
Topic: A few questions about the golden ratio
Replies: 14
Views: 3906

Re: A few questions about the golden ratio

Interestingly, the largest region of inputs that require a lot of computational time for Euclid's algorithm (for finding the GCD of two numbers) is along the line [imath]y = \phi x[/imath].
by Qwert
Sat Jan 08, 2011 5:54 pm UTC
Forum: Science
Topic: Wave on a string propagating into a black hole
Replies: 15
Views: 1977

Re: Wave on a string propagating into a black hole

You're right, I wasn't aware of how serious that was. But is that all there is to it? Does the existence of the string itself guarantee that the wave will come back? It is tempting to think about a black hole as an object from which you have to go faster than light to escape, and therefore nothing ...
by Qwert
Fri Dec 24, 2010 5:20 am UTC
Forum: Fictional Science
Topic: What fictional science is required for space-fighers?
Replies: 131
Views: 17962

Re: What fictional science is required for space-fighers?

On the laser issue: Mass Effect had a great point on the effectiveness of lasers in space combat. No laser today fires a perfectly parallel beam, so at long engagement ranges they are essentially bright lights. Also as a battle would progress debris and vented atmospheres would further degrade laser...
by Qwert
Wed Dec 22, 2010 8:08 am UTC
Forum: Science
Topic: particle vs wave explanation
Replies: 25
Views: 3787

Re: particle vs wave explanation

It's a kind of vague question, but I'll give it a shot. We know that light in some ways acts as a particle, mostly through effects such as black-body radiation, the photoelectric effect, and Compton scattering, which only make sense if light comes in discrete packets (and "quantum" means ...
by Qwert
Wed Dec 22, 2010 2:02 am UTC
Forum: Science
Topic: Lunar Eclipse Dec. 20/21!!
Replies: 11
Views: 2034

Re: Lunar Eclipse Dec. 20/21!!

Photodump time Jupiter, through the telescope: jupiter.jpg Moon pre eclipse through the 'scope: P1000143.JPG Eclipse is starting, just the camera: P1000241.JPG P1000243.JPG Through the scope (really misty so the shadow was dark grey): P1000251.JPG 15 or so minutes later, rest are just camera shots: ...
by Qwert
Tue Dec 21, 2010 12:42 am UTC
Forum: Science
Topic: Lunar Eclipse Dec. 20/21!!
Replies: 11
Views: 2034

Re: Lunar Eclipse Dec. 20/21!!

Totally bumping this with a reminder that it is happening tonight starting at 1:30 am EST and ending at 5am with the greatest eclipse at 3:17am EST (oops, was reading off the wrong timezone before :oops: ). Also totally going to spam any good pictures I get like I did during the last one:
by Qwert
Thu Dec 09, 2010 3:03 am UTC
Forum: Science
Topic: Rotation Problem
Replies: 18
Views: 2093

Re: Rotation Problem

It's what I got plugging into Wolfram Alpha so I think so. On whether it seems reasonable: I_{0}\omega_{0} = I_{1}\omega_{1} I_{0} = {2\over5}mr_{0}^2 I_{1} = {2\over5}mr_{1}^2 {r_{0}^2 \omega_{0} \over r_{1}^2} = \omega_{1} with some very rough magnitude checks you get: r_{0}^2\approx 10^{16} \omeg...
by Qwert
Thu Dec 09, 2010 1:09 am UTC
Forum: Science
Topic: Rotation Problem
Replies: 18
Views: 2093

Re: Rotation Problem

What changes in that function when the shape changes?
by Qwert
Thu Dec 09, 2010 1:05 am UTC
Forum: Mathematics
Topic: Double integrals in polar
Replies: 12
Views: 1368

Re: Double integrals in polar

A polar integral is: \frac12\int_a^b \left[r(\theta)\right]^2\, d\theta Which with double integrals is: \int_{a}^{b}\int_{0}^{r(\theta)}r\, dr\, d\theta not \int_{a}^{b}\int_{c}^{d}r(\theta)\, dr\, d\theta In this case, r(\theta) = 2 , giving you \int_{0}^{2\pi}\int_{...
by Qwert
Thu Dec 09, 2010 12:44 am UTC
Forum: Science
Topic: Rotation Problem
Replies: 18
Views: 2093

Re: Rotation Problem

ajd007 wrote:You're close. You mentioned something about the moment of inertia. What does this depend on?
Also think about the concept of angular momentum. What property does it have in an isolated system?



In particular, is there something special about the shape of the sun that matters here?
by Qwert
Sun Nov 28, 2010 2:40 am UTC
Forum: Forum Games
Topic: Factorial!
Replies: 99
Views: 54451

Re: Factorial!

78! = 11324281178206297831457521158732046228731749579488251990048962825668835325234200766245086213177344000000000000000000
by Qwert
Sun Nov 21, 2010 8:21 am UTC
Forum: Science
Topic: Is gravity really weak?
Replies: 18
Views: 2771

Re: Is gravity really weak?

Quoting the Wikipedia article on the fundamental forces: To get an idea of just how strong the electric force is, let us make a calculation. In a 1-gallon-U.S. (approx. 4 liter) jug of water, there are approximately 4,000 grams of water or 4000 \ \mbox{g}\,H_2 O \cdot \frac{1 \ \mbox{mol}\,H_2 O}{18...
by Qwert
Fri Nov 12, 2010 7:16 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0818: "Illness"
Replies: 116
Views: 36135

Re: 0818: "Illness"

It's all we can ask that he tells us that things might be changing instead of disappearing for a while with no notice.

Hope everything turns out ok for him and his family. :)
by Qwert
Fri Sep 17, 2010 5:30 am UTC
Forum: Gaming
Topic: Cool games on the interweb redux
Replies: 514
Views: 332896

Re: Cool games on the interweb redux

rtg928 wrote:Does anyone know how to download flash and java based games? I want to play some of these games when I am offline.

I just use the little "Block" tab addblock plus adds to flash/java elements. The custom field has the exact address of the file.
by Qwert
Thu Aug 05, 2010 7:55 am UTC
Forum: Science
Topic: The relativistic doppler effect
Replies: 8
Views: 1520

Re: The relativistic doppler effect

doogly wrote:The wavelength of the light length contracts, the frequency time dilates. The light is not a point particle.


More accurately, do to the Wave–particle duality, light behaves as both a wave and a particle; in this case, we are talking about a wave-like property.
by Qwert
Fri Jul 30, 2010 7:57 am UTC
Forum: Gaming
Topic: Alien Swarm
Replies: 149
Views: 13548

Re: Alien Swarm

On hard, I like taking both miniguns and the tesla sentries. Autogun is awesome for killing a few baddies at any range while sipping ammo (thank you autoaim!) while the other minigun is kick-ass for killing 30 at once in a hallway as they swarm you. Best part is that the guns share clips, so you get...
by Qwert
Fri Jul 30, 2010 4:08 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0773: "University Website"
Replies: 177
Views: 40459

Re: "University Website" discussion (#773)

SO TRUE!

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