Search found 20546 matches

by gmalivuk
Mon Jan 23, 2017 4:00 pm UTC
Forum: Science
Topic: Spaceship using Kepler's 2nd Law
Replies: 19
Views: 1217

Re: Spaceship using Kepler's 2nd Law

To illustrate: it takes more delta-v to get from LEO to GSO than it does to go from LEO to an escape trajectory - hence a mass in GSO possesses more than enough energy to escape This is false. The delta-v calculation tells us that a rocket capable of getting to GSO is also capable of escaping, but ...
by gmalivuk
Sun Jan 22, 2017 7:56 pm UTC
Forum: News & Articles
Topic: Trump presidency
Replies: 1049
Views: 41485

Re: Trump presidency

That's not new, is it? That's the standard relation between journalists and people in power. If the journalists get overly critical, they get cut off and become one of the loonies. The Trump administration is perhaps a tad unexperienced, so the game leaks out to the public.But they'll learn fast en...
by gmalivuk
Sun Jan 22, 2017 1:34 am UTC
Forum: News & Articles
Topic: Trump presidency
Replies: 1049
Views: 41485

Re: Trump presidency

00.08% = 0.0008

That's not where the problem was.
by gmalivuk
Sun Jan 22, 2017 12:49 am UTC
Forum: News & Articles
Topic: Trump presidency
Replies: 1049
Views: 41485

Re: US President

↶ She also won the popular vote by a lot less than fivethirtyeight predicted though so their method was off on that as well. If anything that is worse for their method because being 1.2pp off on a predicted 3.5pp spread for a very close race is quite a bit. Besides its not like they accidentally ma...
by gmalivuk
Thu Jan 19, 2017 11:20 pm UTC
Forum: Science
Topic: RELATIVITY QUESTIONS! (and other common queries)
Replies: 2814
Views: 492503

Re: RELATIVITY QUESTIONS! (and other common queries)

I feel like it's simpler to say dots and shadows aren't the sorts of things that carry information with them, than to say that there's no such thing as a laser dot or a shadow.
by gmalivuk
Thu Jan 19, 2017 8:28 pm UTC
Forum: General
Topic: Random natterings
Replies: 89482
Views: 4879887

Re: Random natterings

Nope.

PM a mod once you've read the rules and taken a timeout, if you want to be able to post again.
by gmalivuk
Wed Jan 18, 2017 6:24 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1787: "Voice Commands"
Replies: 54
Views: 5327

Re: 1787: "Voice Commands"

Old Bruce wrote:That isn't how "GOOGLE" is spelt/spelled.

How do you figure?
by gmalivuk
Mon Jan 16, 2017 6:08 pm UTC
Forum: Movies and TV Shows
Topic: The OA
Replies: 6
Views: 564

Re: The OA

Yeah, I really wanted to like it for the same reasons you started, natraj, but a storytelling-centered plot around a storyteller I find less interesting than anyone else on the show turns out not to really be able to hold my interest very long. (Plus reading some spoilery discussions on FB, it seems...
by gmalivuk
Sat Jan 14, 2017 4:19 pm UTC
Forum: Science
Topic: Can you (passively) heat an object hotter than your source?
Replies: 98
Views: 14317

Re: Can you (passively) heat an object hotter than your source?

As already explained, it comes out every point of the surface in every direction. Each photon that doesn't come out perpendicular to the surface won't get reflected directly toward the other focus of the enclosure. The smaller the other object is, the fewer photons hit its surface.
by gmalivuk
Fri Jan 13, 2017 1:19 pm UTC
Forum: Science
Topic: Ideal balance of two bodies in orbit
Replies: 28
Views: 1937

Re: Ideal balance of two bodies in orbit

Put up or shut up.

Just get to whatever point you want to make, or stop wasting database space with these posts that don't actually say anything.
by gmalivuk
Fri Jan 13, 2017 12:34 am UTC
Forum: Science
Topic: Ideal balance of two bodies in orbit
Replies: 28
Views: 1937

Re: Ideal balance of two bodies in orbit

Tal-Seto wrote:i need a explanation of the principles of a wave

https://en.wikipedia.org/wiki/Gravitational_wave
by gmalivuk
Thu Jan 12, 2017 8:16 pm UTC
Forum: Science
Topic: Ideal balance of two bodies in orbit
Replies: 28
Views: 1937

Re: Ideal balance of two bodies in orbit

Tal-Seto wrote:
gmalivuk wrote:Ah, wonderful. A crackpot.

With a perfect explanation =:)

If you posted a picture of a horse and I responded, "Oh look, a horse," would you also complain about the lack of explanation for my statement?
by gmalivuk
Thu Jan 12, 2017 6:07 pm UTC
Forum: Science
Topic: Ideal balance of two bodies in orbit
Replies: 28
Views: 1937

Re: Ideal balance of two bodies in orbit

Ah, wonderful. A crackpot.
by gmalivuk
Thu Jan 12, 2017 4:55 pm UTC
Forum: What If?
Topic: What-If 0145: "Fire From Moonlight"
Replies: 157
Views: 22036

Re: What-If 0145: "Fire From Moonlight"

The surface of the moon is probably not a significantly different temperature than a shaded object slightly above the surface of the moon, which would account for all the reflected sunlight. Some posters clearly disagree with that assumption. Sure, and some people think the Earth is flat. I have no...
by gmalivuk
Thu Jan 12, 2017 4:06 pm UTC
Forum: News & Articles
Topic: The Darker Side of the News
Replies: 2464
Views: 252524

Re: The Darker Side of the News

Officially known as the Naval Special Warfare Development Group, SEAL Team 6 is today the most celebrated of the U.S. military’s special mission units. But hidden behind the heroic narratives is a darker, more troubling story of “revenge ops,” unjustified killings, mutilations, and other atrocities...
by gmalivuk
Wed Jan 11, 2017 11:35 pm UTC
Forum: What If?
Topic: What-If 0145: "Fire From Moonlight"
Replies: 157
Views: 22036

Re: What-If 0145: "Fire From Moonlight"

The surface of the moon is probably not a significantly different temperature than a shaded object slightly above the surface of the moon, which would account for all the reflected sunlight.
by gmalivuk
Wed Jan 11, 2017 6:05 pm UTC
Forum: Mathematics
Topic: Mathematics of p-hacking: random walks and significance
Replies: 2
Views: 664

Re: Mathematics of p-hacking: random walks and significance

Yeah, I know there are ways to deal with sequential testing, just as there are ways to adjust for multiple comparisons. I was just curious about the probabilities when things are being done improperly, either through naivete or dishonesty. (For example, as you increase the number of separate ("...
by gmalivuk
Wed Jan 11, 2017 5:41 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1784: "Bad Map Projection: Liquid Resize"
Replies: 58
Views: 4103

Re: 1784: "Bad Map Projection: Liquid Resize"

So far it appears the coding nerds haven't woken up. I was hoping to see code snippets posted that would let Photoshop (or GIMP) do liquid rescaling based on all sorts of other map-ish parameters. Here's some suggestions: coastline (cue the Fractal Folk), number of nukes, or number of microbrewerie...
by gmalivuk
Tue Jan 10, 2017 11:11 pm UTC
Forum: Mathematics
Topic: Mathematics of p-hacking: random walks and significance
Replies: 2
Views: 664

Mathematics of p-hacking: random walks and significance

I was thinking about the phenomenon of p-hacking (or data dredging ), and how it's much more likely to give apparently significant results than proper hypothesis testing would give. In particular, I'm considering the case where a researcher keeps increasing the sample size until statistical signific...
by gmalivuk
Tue Jan 10, 2017 1:45 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 233
Views: 10163

Re: Science-based what-if questions

How many lenses will get you a death beam?
by gmalivuk
Mon Jan 09, 2017 10:03 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1779: "2017"
Replies: 71
Views: 5744

Re: 1779: "2017"

It's especially hilarious because Tallest Skil likes to try to silence the people who disagree with him in these discussions by reporting their posts for things like "racism" and "genocide".
by gmalivuk
Mon Jan 09, 2017 4:39 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1779: "2017"
Replies: 71
Views: 5744

Re: 1779: "2017"

Well, this year, I started to take different forms of Doomsday argument a tiny bit more seriously. The form of the argument that I've found slightly unnerving: what is the chance that the world population distribution over time will resemble a) sigmoid until eternity, b) exponential until fast coll...
by gmalivuk
Mon Jan 09, 2017 4:08 pm UTC
Forum: Science
Topic: Light in a fog
Replies: 14
Views: 947

Re: Light in a fog

At the very least, you're simplifying directionality in a way that feels like too much. If you posit at the beginning that the radiant flux through, say, a window at any orientation into a fogless room is exactly 1000W/m^2, and then you posit a solar panel that has no dependency on the direction of ...
by gmalivuk
Sun Jan 08, 2017 3:20 pm UTC
Forum: Science
Topic: Science-based what-if questions
Replies: 233
Views: 10163

Re: Science-based what-if questions

No, it doesn't make any difference. No amount of simple lenses can do what you want.
by gmalivuk
Sun Jan 08, 2017 3:17 pm UTC
Forum: Fictional Science
Topic: Believe
Replies: 15
Views: 925

Re: Believe

What would life be like if the universe shaped itself to reflect the shared beliefs of its inhabitants? Discworld. Alright, what would happen if one day the universe started operating like that? Then the universe would probably start looking (even more) like has already been extensively described i...
by gmalivuk
Sat Jan 07, 2017 11:49 pm UTC
Forum: Fictional Science
Topic: Believe
Replies: 15
Views: 925

Re: Believe

What would life be like if the universe shaped itself to reflect the shared beliefs of its inhabitants? Discworld. Alright, what would happen if one day the universe started operating like that? Then the universe would probably start looking (even more) like has already been extensively described i...
by gmalivuk
Sat Jan 07, 2017 9:49 pm UTC
Forum: Mathematics
Topic: Misunderstanding basic math concepts, help please?
Replies: 319
Views: 29091

Re: Misunderstanding basic math concepts, help please?

Yes, things like = and < are symbols, but they are symbols that work in a particular way that can be precisely described using first-order logic. It takes a bit more work to get to the real numbers and hence to measures of distance, but that can be done in a systematic, step-by-step way, too. A set ...
by gmalivuk
Thu Jan 05, 2017 11:02 pm UTC
Forum: Science
Topic: Would the disco ball really still end up inside a black hole?
Replies: 12
Views: 1078

Re: Would the disco ball really still end up inside a black hole?

For those who lack the time/inclination to watch the 8-minute video: Scenario: Aliens want to destroy the Earth by surrounding the solar system with their ships and sending a pulse of light toward us that has enough energy to create a black hole with a Schwarzschild radius of 1 light-second. Disco B...
by gmalivuk
Thu Jan 05, 2017 10:00 pm UTC
Forum: Fictional Science
Topic: Real one way glass
Replies: 27
Views: 2081

Re: Real one way glass

...except for light bombs and solar batteries
by gmalivuk
Thu Jan 05, 2017 9:59 pm UTC
Forum: Gaming
Topic: Fallout 4
Replies: 141
Views: 13682

Re: Gaming fleeting thoughts

Obviously a lot of Thesh's ideas are impractical, but a lot of the naysaying also seems pretty ignorant of how the game already works or of what Thesh meant. Anyone can be permanently killed in an attack, or while on patrol, in a caravan, or scavenging (you better make sure you give them a proper bu...
by gmalivuk
Thu Jan 05, 2017 9:25 pm UTC
Forum: Gaming
Topic: Gaming fleeting thoughts
Replies: 539
Views: 38979

Re: Gaming fleeting thoughts

I split the FO4 discussion into the FO4 thread, as it was no longer really fleeting (plus that's one of the few threads that correctly shows up in my egosearch so I'll be able to keep up with the conversation there more than here).
by gmalivuk
Thu Jan 05, 2017 6:05 pm UTC
Forum: Fictional Science
Topic: Real one way glass
Replies: 27
Views: 2081

Re: Real one way glass

How's that supposed to prevent light from coming back out the hole it went in?

In any case, we'll need the OP to clarify exactly what's meant by one-way, as I was taking it to mean thermal radiation also doesn't pass back the other way (hence its being impossible).
by gmalivuk
Thu Jan 05, 2017 5:24 pm UTC
Forum: Fictional Science
Topic: Real one way glass
Replies: 27
Views: 2081

Re: Real one way glass

In but not out, I said.
by gmalivuk
Thu Jan 05, 2017 5:35 am UTC
Forum: Science
Topic: RELATIVITY QUESTIONS! (and other common queries)
Replies: 2814
Views: 492503

Re: RELATIVITY QUESTIONS! (and other common queries)

Yes, the spot from a laser pointer can move faster than light, and need not break apart or anything along the way. There's nothing relativity breaking about the photons you release now eventually ending up light years away from photons you released a second ago. Both destinations still have to wait ...
by gmalivuk
Thu Jan 05, 2017 2:00 am UTC
Forum: Logic Puzzles
Topic: Infinite Balls and Jugs [solution]
Replies: 611
Views: 50610

Re: Infinite Balls and Jugs [solution]

Okay, but complex numbers and limits are immensely useful for (the technology underlying) everyday life, irrespective of how uncomfortable you are with the implications thereof in certain contrived cases. I agree completely with the main point here (and now that we're talking about usefulness inste...
by gmalivuk
Wed Jan 04, 2017 11:50 pm UTC
Forum: Logic Puzzles
Topic: Infinite Balls and Jugs [solution]
Replies: 611
Views: 50610

Re: Infinite Balls and Jugs [solution]

Okay, but complex numbers and limits are immensely useful for (the technology underlying) everyday life, irrespective of how uncomfortable you are with the implications thereof in certain contrived cases.
by gmalivuk
Wed Jan 04, 2017 10:03 pm UTC
Forum: Logic Puzzles
Topic: Infinite Balls and Jugs [solution]
Replies: 611
Views: 50610

Re: Infinite Balls and Jugs [solution]

Any representation of the exact value of pi involves an infinity somewhere, no matter how much imagining you do with some approximations of circles. And what exactly is the distance around a curve? Distances between points I'll grant you, but what's a distance around a curve? What do you look at in ...
by gmalivuk
Wed Jan 04, 2017 8:28 pm UTC
Forum: Mathematics
Topic: Misunderstanding basic math concepts, help please?
Replies: 319
Views: 29091

Re: Misunderstanding basic math concepts, help please?

Treatid: You seem to keep mixing your incomplete understanding of mathematics with your incomplete understanding of physics. Math is perfectly capable of defining both distance and continuity (in multiple ways in fact), even if we're not quite sure how exactly distance works at the smallest physical...
by gmalivuk
Wed Jan 04, 2017 5:47 pm UTC
Forum: Logic Puzzles
Topic: Infinite Balls and Jugs [solution]
Replies: 611
Views: 50610

Re: Infinite Balls and Jugs [solution]

It does mean that claiming that supertasks, infinite cardinalities and, yes, even complex numbers have objective validity (or objective truth) is simply not true. What is "objective validity"? Where in objective reality can you find pi? I don't mean some approximation to a few dozen digit...
by gmalivuk
Wed Jan 04, 2017 12:48 pm UTC
Forum: Logic Puzzles
Topic: Infinite Balls and Jugs [solution]
Replies: 611
Views: 50610

Re: Infinite Balls and Jugs [solution]

The limit of the set of balls in the jug is the empty set. You can argue against defining the result of the supertask as this limit, but you can't deny that limits have real-world applications. The proof by finite induction only proves that the jug is not empty at any finite step, which no one denie...

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