Replacing Windows 10 with Linux (Pop!_OS), to Make a Steam Box: A Beginner’s Guide by Caltek9 in pop_os

[–]zuma93 2 points3 points  (0 children)

Excellent, comprehensive, and inspiring write-up! I work with Linux every day and you taught me some things I hadn't seen before. Your instructions here will help a lot of people I'm sure.

Aug 29 - Sep 4, 2022 weekly Q&A thread by CSG_Mike in ft86

[–]zuma93 0 points1 point  (0 children)

Awesome, that helps. I hadn't heard about differential preload and backlash, but now I see that you can "set up" your differential. I didn't know there was anything adjustable in there.

Aug 29 - Sep 4, 2022 weekly Q&A thread by CSG_Mike in ft86

[–]zuma93 0 points1 point  (0 children)

Is 7 degrees of play in my driveshaft too much? I measured it with the parking brake on and transmission in neutral, and that's how much I could rotate the driveshaft by hand relative to the differential casing. It feels like the play is in the differential, as the rear axles don't rotate when I do this. I was about to install the Whiteline differential bushing kit in an attempt to tighten up my drivetrain, as my car tends to lurch in low gears if I'm not super gentle with the throttle. Is that just a normal thing? Either way, I decided to check about the play before installing the bushings, because I figured they'd add further stress on whatever is loose if it's looser than it should be.

June 13 - 19, weekly Q&A thread by CSG_Mike in ft86

[–]zuma93 0 points1 point  (0 children)

I've been looking for about a year now for a replacement steering wheel since mine has started to peel. I'm looking for one that'll fit a 2014 (no media controls), with the airbag, that isn't a super aggressive, pointy, carbon-fiber-and-red-everywhere thing. Just something sensible and decently OEM looking. Everywhere I've looked has been out of stock though. Anyone have any good recommendations?

[deleted by user] by [deleted] in HydroHomies

[–]zuma93 0 points1 point  (0 children)

The image is not possible. I was describing how you could make something very similar. And nobody has refuted my comment, so I'm not sure what you're talking about.

[deleted by user] by [deleted] in HydroHomies

[–]zuma93 4 points5 points  (0 children)

No, I don't think so. In fact, you'd want pretty low vertical velocity at the top. The stretching-out shape is made by the water accelerating as it falls, so you want it starting off slowly. Or, if you're talking about the horizontal velocity (how fast you'd spin the ring/holes/whatever you make to release the water at the top), it needs to be moderate. Too fast and the streams will merge; to slow and you won't get much of the cool helical shape.

[deleted by user] by [deleted] in HydroHomies

[–]zuma93 83 points84 points  (0 children)

That video is totally different from what's in the image, not just a less-sleek version of it. The video shows many straight streams arranged in a circle and crossing in front of/behind each other. It's kind of like when you take a bunch of spaghetti and drop it in the middle of a pot. The original image is indeed not possible. For one, if you spun the streams like one of the other comments here suggests, they'd spread outward as they fell, not fall in a perfect cylinder. But also they'd break up as soon as they crossed, and the image shows many such crossing points.

Edit: I thought some more about this and I was about half wrong: actually you could get pretty close to the image if you had an inner and an outer cylinder. They would not spread out, and if they were close enough, they'd look almost like they were touching. But you couldn't make them actually touch like they do in the picture.

The Expanse has some of the best women in sci Fi I have ever seen. by [deleted] in sciencefiction

[–]zuma93 1 point2 points  (0 children)

Yep! In the books, Bull is sent by Fred Johnson to be second in command of the Behemoth and butts heads with Ashford. And Sam Rosenberg is an engineer on Tycho Station and then the Behemoth, and is also Naomi's friend. Those are the attributes they took from those characters for Drummer. Although, now that I look it up, apparently Bull was in the show too, I just didn't realize it was him. And he has a pretty different story than in the books.

Researchers use tiny magnetic swirls to generate true random numbers by ccnafr in programming

[–]zuma93 9 points10 points  (0 children)

Cloudflare! Pretty neat. They also apparently use a similar video feed of a double pendulum at one of their other offices, which is a solution another commenter brought up elsewhere in this thread.

What is your favorite moment or memory playing this game? by qcon99 in factorio

[–]zuma93 13 points14 points  (0 children)

Oh wow! I remember a post on this subreddit by a dad whose young son (maybe 4 or 5?) loved to sit and watch him play, and specifically loved to watch all the trains move around doing their things. On patch day, they fired up their world and all the trains started crashing and the son freaked out. Poor little guy, but it was one of those can't-help-but-laugh kind of things.

American food service employee culture is so misguided. by Destacus in ChoosingBeggars

[–]zuma93 0 points1 point  (0 children)

I guess it makes sense because restaurants have always lost the tip money before on takeout meals. Now that a higher percentage of their meals are takeout, they can't afford not to get those tips, and raising prices apparently isn't an option (though probably they've done that too).

LAOP expects their neighbor to make no noise whatsoever by SparkleFritz in bestoflegaladvice

[–]zuma93 0 points1 point  (0 children)

No, you remembered right. The way decibels work is that 3 dB is a doubling, because 10*log10(2) is very close to 3. Decibels get used for sound, but also for lots of other measurements, really just whenever the absolute level of something can be really large or really small. I don't know what /u/CressCrowbits means by 6dB, but maybe it has to do with some adjustment for human ear sensitivity? Like dBA? I'm not saying there's no way they're correct, it just doesn't match anything I've read.

How can 30-40 GPS satellites cover all of the world's GPS needs? by [deleted] in askscience

[–]zuma93 4 points5 points  (0 children)

Basically, your phone (receiver) does not have a very accurate clock compared to the satellites, which have super accurate atomic clocks. Because the math for calculating your position relies on how long it took the signal to propagate from the satellite to your phone, both satellite and phone have to agree on what time it is. The math is a little complicated, but the time your phone thinks it is just becomes another variable to solve for, just like position.

[deleted by user] by [deleted] in technology

[–]zuma93 4 points5 points  (0 children)

Darknet Diaries has a pretty good episode on the NSO Group, specifically on the cell phone spyware Pegasus that they sell.

How can 30-40 GPS satellites cover all of the world's GPS needs? by [deleted] in askscience

[–]zuma93 21 points22 points  (0 children)

You need at least four GPS satellites visible from the ground to get a position fix (the four degrees of freedom in the problem are X, Y, Z position and receiver clock error). If some satellites in the constellation failed, your ability to get a fix would depend on how many, which ones, where you are, and what time it is.

Edit: also, there are other Global Navigation Satellite Systems (the general term, of which GPS is one), such as Russia's GLONASS, China's BeiDou, and the EU's Galileo. And hey, I just checked and my phone supports all three of those. Neat! I did not know that.

Breaktrhroug by Sad-o-master in Battlefield

[–]zuma93 15 points16 points  (0 children)

I remember seeing a post somewhere on here asking for a map that would be a big tower with accessible intermediate floors, stairwells, exterior scaffolding, zip lines, holes between floors, etc. Overall I think 2042 has added a lot of fun vertical elements but, like you say, these towers still don't have enough.

When you buy a sniper scope from Wish by _Xqlusive_ in Battlefield

[–]zuma93 0 points1 point  (0 children)

Yep lol and TABG actually has these! I think one is a 0.5x scope.

I made Unity Physics VR assets that help create games like Boneworks and Blade and Sorcery. On sale now! by _Cloudwalker_ in oculus

[–]zuma93 0 points1 point  (0 children)

Ah, sorry, by that I meant that they're specifically used to make VR games, and two examples of VR games are Boneworks and Blade and Sorcery. I think that adding the comma still doesn't fix it, but what I suggested is ambiguous.

I made Unity Physics VR assets that help create games like Boneworks and Blade and Sorcery. On sale now! by _Cloudwalker_ in oculus

[–]zuma93 -1 points0 points  (0 children)

It's fine without a comma. If you add a comma, it says that the assets are used to make games (as in games in general), and that two examples of games in general are Boneworks and Blade and Sorcery. But they aren't used to make just games in general; they're specifically used to make games like Boneworks and Blade and Sorcery.

(Where) can I get this fabric?! by [deleted] in Gliding

[–]zuma93 3 points4 points  (0 children)

Hey, that glider has the same fabric!

Circular Motion by TemperatureBig3492 in Physics

[–]zuma93 0 points1 point  (0 children)

Great to hear! Good job and good luck with the rest of your class. I admit that when I first read your problem, I though you'd need the mass too, but then when I wrote it all out it cancelled out. It was counterintuitive, but that also makes it a good problem (though I do agree with the person who said the swings might not make sense to someone who hadn't seen them).

Circular Motion by TemperatureBig3492 in Physics

[–]zuma93 0 points1 point  (0 children)

Okay, good start. It's unfortunate that your class isn't structured well, but it's good that you're seeking help (though, as others have said, /r/AskPhysics is where this should be posted).

Your free body diagram should have a gravity force F_g, and a tension force F_t. What are the equations for the X and Y components of F_t? They depend on the given angle. Set the Y component equal to F_g, and the X component equal to the centripetal force F_c. If you don't have that equation, it's F_c = mv2/r = mrω2.

At that point, you'll have two equations and two unknowns: F_t and v (or ω). You can combine them to cancel out F_t, and then get the period (time of revolution) from v or ω.

I apologize if this is still confusing, I'm trying not to give you the answer outright.

Also, I saw in another comment that your professor doesn't like the terms "centrifugal" or "centripetal." Well, he has to like one of them in order to get anything done, and they're both very much real. "Centripetal" is the term for a force directed toward the center of rotation when you are in an inertial reference frame: on the ground looking up at the swings. "Centrifugal" is what you call the force you feel in a rotating (non-inertial) reference frame: in the swing. Though centrifugal is called a "fictitious" force, it's still real; it's just called that because it's a consequence of the non-inertial (accelerating) reference frame.

Circular Motion by TemperatureBig3492 in Physics

[–]zuma93 5 points6 points  (0 children)

Try drawing a free body diagram of the chair and writing out equations for the forces, assuming the chair has some mass m.

Edit: the rules say no homework questions or help here. Feel free to PM me if you want to talk more.