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by gmalivuk
Thu Jan 26, 2017 11:18 pm UTC
Forum: Science
Topic: Spaceship using Kepler's 2nd Law
Replies: 19
Views: 1183

Re: Spaceship using Kepler's 2nd Law

What bothers you about the tether?

It's like tetherball, but at the center is a planet instead of a pole.
Image
by gmalivuk
Thu Jan 26, 2017 10:19 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1790: "Sad"
Replies: 81
Views: 4714

Re: 1790: "Sad"

I just got home and haven't yet read much that pisses me off, so at this point I've still got a large reserve of restraint when it comes to dealing with that sort of head-in-the-sand fascism denier/apologist.
by gmalivuk
Thu Jan 26, 2017 10:13 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1790: "Sad"
Replies: 81
Views: 4714

Re: 1790: "Sad"

But that's a far cry from Trump being a monster, and his administration being a replay of 1930's Germany. The platform as laid out on whitehouse.gov and his executive orders are extremely fascist looking. Gag orders on scientists and others who might say things contrary to the administration's plat...
by gmalivuk
Thu Jan 26, 2017 5:40 pm UTC
Forum: Science
Topic: Spaceship using Kepler's 2nd Law
Replies: 19
Views: 1183

Re: Spaceship using Kepler's 2nd Law

My conceptual problem is in the difference between a tether and gravity. Gravity always pulls toward the center of the planet. A tether to the surface pulls toward that point on the surface, and if the angular velocity of the surface and the spacecraft differ, eventually the tether will be pulling ...
by gmalivuk
Thu Jan 26, 2017 12:41 pm UTC
Forum: Science
Topic: Spaceship using Kepler's 2nd Law
Replies: 19
Views: 1183

Re: Spaceship using Kepler's 2nd Law

It seems you're missing the fact that the rope is attached to the surface and reels the spacecraft in, where conservation of momentum means it speeds up.
by gmalivuk
Wed Jan 25, 2017 10:57 pm UTC
Forum: News & Articles
Topic: Trump presidency
Replies: 1030
Views: 39239

Re: Trump presidency

Where the hell is this idea of paranoia or schizophrenia coming from, anyway? Trump is lying , as he has been all along. Trivializing the rise of fascism with armchair diagnoses doesn't do anything to solve the problem and indirectly harms people who do have paranoid schizophrenia but manage not to ...
by gmalivuk
Wed Jan 25, 2017 10:34 pm UTC
Forum: Mathematics
Topic: Combinatorics with constraint
Replies: 14
Views: 1343

Re: Combinatorics with constraint

Dude, you can edit posts to add additional information. Please don't post 3 or 4 times in a row.
by gmalivuk
Wed Jan 25, 2017 4:41 pm UTC
Forum: Science
Topic: Spaceship using Kepler's 2nd Law
Replies: 19
Views: 1183

Re: Spaceship using Kepler's 2nd Law

No circular orbit (however big it may be) on its own has enough energy to escape, because the kinetic energy must be less than the gravitational energy in any closed orbit, or else it wouldn't be a closed orbit. However, *pulling* the ship in toward the planet does work on it, because it applies a f...
by gmalivuk
Tue Jan 24, 2017 10:02 pm UTC
Forum: Gaming
Topic: Board games anyone?
Replies: 796
Views: 152071

Re: Board games anyone?

Getting hemmed in is a real thing that can really happen in real Catan games, even without multiple jackasses purposely fucking with you, as evidenced by the number of "how to avoid being hemmed in" threads a quick Google provided. Sure, it might not happen at Grandmaster-level competition...
by gmalivuk
Mon Jan 23, 2017 4:00 pm UTC
Forum: Science
Topic: Spaceship using Kepler's 2nd Law
Replies: 19
Views: 1183

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: 1030
Views: 39239

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: 1030
Views: 39239

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: 1030
Views: 39239

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: 2804
Views: 491225

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: 89472
Views: 4863038

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: 5264

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: 545

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: 14236

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: 1912

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: 1912

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: 1912

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: 1912

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: 21971

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: 2459
Views: 251236

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: 21971

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: 647

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: 3994

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: 647

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: 9959

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: 5720

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: 5720

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: 923

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: 9959

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: 912

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: 912

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: 29002

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: 1036

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: 2073

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: 13642

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...

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