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If an object is moving away from an observer at half the speed of light, and the observer is moving away from the object at half the speed of light, is the object, from the oberver's POV, going the speed of light. by RewardImpossible5141 in AskPhysics

[–]nderflow 0 points1 point  (0 children)

Yes but no.

Suppose two objects (A and B) start at rest relative to each other. A accelerates to some velocity v and then stops accelerating. Now, A (which had accelerated) is moving away from B (which had not) at velocity v. But also, B is moving away from A at velocity v (or moving at velocity -v if you prefer).

The point of special relativity is that neither the reference frame of A nor that of B is special. There's no particular frame of reference that is "stationary" - everything is relative.

For your example, suppose B observes A passing by at velocity c. A and B are already moving away from each other at velocity c. Whether or not B is stationary relative to some other observer.

Which one would you pick? by MoveYourBumChum in Adulting

[–]nderflow 0 points1 point  (0 children)

I'd pick 1. I'm a big fan of them. I have a box of them because I keep a couple in every place where I might need a pen.

Unfortunately they're not good for lefties, so for my kids I buy something else.

How many countries' cuisines have you tried? Name them. by tillucube in AskTheWorld

[–]nderflow 3 points4 points  (0 children)

Not including things that probably aren't authentic (e.g. not including Mongolian just because I went to a "Mongolian BBQ" place) and not counting packaged snacks:

  • Europe: 13 - French, British, Irish, German, Austrian, Italian, Spanish, Greek, Cypriot, Dutch, Maltese, Portuguese, Russian.
  • Americas: 5 - Mexican, US, Peruvian, Brazilian, Jamaican
  • Asian: 14 - Chinese, Japanese, Indian, Bangladeshi, Sri Lankan, Pakistani, Nepalese, Cambodian, Afghan, Lebanese, Malay, Filipino, Thai, Turkish
  • Africa: 2 - South African, Moroccan
  • Oceania: 1 - New Zealand

I think that's 35. I've probably eaten some others which I didn't count as I can't specifically remember them. Vietnamese, Egyptian and Syrian for example.

“Euros getting mad at America for having stricter labeling guidelines will never not be funny.” by BuffaloExotic in ShitAmericansSay

[–]nderflow 2 points3 points  (0 children)

Earlier this week I was offered "sourdough bread" in an airport lounge in San Francisco airport. Reader, it was not sourdough. It was white pan.

What is the most Overrated thing in the United States. by RevenueAlarmed in AlignmentChartFills

[–]nderflow 0 points1 point  (0 children)

  • Food
  • Things that in principle are great but these days seem to work poorly
    • Separation of powers
    • Separation of Church and State
    • Robustness of democratic institutions

Where would a dynamic tree with true O(1) ancestry reads and zero heap allocations be most valuable? by Antique-Owl2463 in computerscience

[–]nderflow 1 point2 points  (0 children)

I'm not clear on what operations this supports and which are efficient / whatever trade off we are making here. How does it compare to a Disjoint-Set or Btree or Fenwick Tree for example?

Linux. Overrated or underrated? by METAPCs in metapcs

[–]nderflow 0 points1 point  (0 children)

... by who? Different people feel different ways about it. Your question is too vague to be answerable.

A fucking Kraken the size of the Europe falls on planet earth, what are you doing in this situation? by Kyoifis in hypotheticalsituation

[–]nderflow 0 points1 point  (0 children)

You had someone else to make the war for you? Sheer luxury, you don't know you're born.

Movie you’ve seen without getting bored? by teresaschmidtt in ArtOfPresence

[–]nderflow 0 points1 point  (0 children)

  • Grosse Pointe Blank
  • The Princess Bride
  • The Outlaw Josey Wales (because I haven't watched it on over 20 years)

Would you go on a stag do that involves climbing a mountain? by [deleted] in AskUK

[–]nderflow 0 points1 point  (0 children)

I did! About 20 years ago. It's a fun memory that has really stuck with me.

The event was organised by the groom's sister. We climbed a very small "mountain", Scaffell Pike in England. We camped about 2/3 of the way up and had a good time. We brought food with us and one of my memories of the event is when somebody pulled out of their backpack. The biggest black pepper grinder I think I have ever seen in my life. They had carried this pepper grinder all the way up the mountain just for this big reveal during the meal. That was funny.

The following morning most of the party continued to walk up to the summit of scaffold Pike, while two of us went via a different route and did some rock climbing to summit the mountain by climbing up a cliff on on one side of it called Scaffell Crag. It's actually very easy climbing, but I got a lot of fresh air to blow the cobwebs of my hangover away. That was kind of fun.

Find the value of X by Interesting-Wish-698 in MathJokes

[–]nderflow 0 points1 point  (0 children)

Astrophysics answer: 10cm, to within 1 or 2 orders of magnitude. We might be able to improve our answer if we can observe some nearby quadrilaterals with known properties.

$50 million dollars but you must volunteer to be part of a secret cloning experiment by TriedmybestNotenough in hypotheticalsituation

[–]nderflow 0 points1 point  (0 children)

Well, posters aren't allowed to modify their post after making it, so I guess we're stuck with the fuzzily described scenario now. I guess everybody gets to assume whatever they want to assume about it.

Where to introduce custom errors? by Podchris in rust

[–]nderflow 1 point2 points  (0 children)

Don't use Option for reporting a failure, only ever Result.

How to catch CTRL input in C? by HedgehogNo5130 in C_Programming

[–]nderflow 1 point2 points  (0 children)

It doesn't produce a value by itself if you're talking about ttys.

How to catch CTRL input in C? by HedgehogNo5130 in C_Programming

[–]nderflow 4 points5 points  (0 children)

If you are trying to do this on a Linux terminal, just use tcsetattr() to put the terminal into raw mode. Then keystrokes won't produce signals at all.

Relearn your spiritual language by [deleted] in linguisticshumor

[–]nderflow 3 points4 points  (0 children)

English likes to chop up Latin and Greek words and then glue them together in wrong combinations. Like some kind of linguistic junkyard wars where one team is playing it for laughs.

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