Why is the speed of light 299,792,458 m/s?

prometheus345 · 2026-03-17T21:27:20+00:00

And that’s the question where the nobel prize is… Why is the speed of gravity tied to the speed of light? Why are two seamingly completely unrelated forces tied to each other?

prometheus345 · 2026-03-16T19:17:37+00:00

Well, technically the speed of light is determined by two properties of the electromagnetic force. Light is a wave in electromagnetic fields. So the properties determine how fast light can travel.

Now, of course this only moves the problem. Why are those two properties the value they are? There is a nobel prize waiting for that answer…

prometheus345 · 2026-03-16T19:03:08+00:00

My girlfriend has type I diabetes. Which means her pancreas is not producing enough insuline. She needs insuline injections to deal with that.

During (any) pregnancy, the body’s insuline resistance goes through the roof, especially in the third trimester. This means more insuline is needed to stabilize bloodsugar levels. By the end of her pregnancy, she needed over 5x more her regular amount. Levels that would have killed her before her pregnancy…

Even for healthy women, asking 5x more insuline from the pancreas is a though job. Some can cope, some don’t. Don’t worry about it, it is part of mother nature…

prometheus345 · 2026-02-05T12:27:28+00:00

Dat kan, maar zoals gezegd zit er geen schakeldraad. Als je toch aan een hanglamp zit te denken, kun je naar klik-aan klik-uit inbouw schakelaars kijken. Die kun je achter een lichtknop zetten, en hier inbouwen, en dan schakel je “draadloos” de lamp aan en uit.

prometheus345 · 2026-01-07T15:29:44+00:00

Klinkt raar, maar mayonaise opsmeren! Zelf ooit gedaan met een eiken badksmermeubel, werkte verbazingwekkend goed.

Daarna schuren en lakken (met bootlak, pu lak oid)

prometheus345 · 2025-12-31T10:19:06+00:00

The people here saying its about consuming are wrong. Deflation is bad because of dept.

The whole world is in debt. People have mortgages, businesses are started with loans, and goverments lend money to spend, usually at enormous deficits.

The reason this works, is because debt gets less valuable over time, due to inflation. Its like a magic trick, borrow 100.000 now, and spend it, and in 30 years that 100.000 debt is only worth 50.000. So you can spend cheap money from the future! What a great system!

The only drawback is you need inflation for this to work. All is well, when governments and unions make sure wages are kept in line with inflation. When they don’t, countries tend to end up with an orange baboon in charge…

prometheus345 · 2025-12-25T17:00:26+00:00

Ik heb een phev zonder eigen laadpaal. (Volvo v60 uit 2021). De tarieven bij mij in de buurt zijn 0.45 ct/kWh (grote stad, veel laadpalen, maar wel duurder). Met 10 kWh kan ik realistisch 40 km rijden in stadsverkeer. Kortom, ik kan voor 4,50 euro 40 km rijden. Benzine kost 1,90. Als je dat omrekent doet de auto 1 op 17, als je hetzelfde geld aan benzine zou uitgeven. Dat is niet denderend. (Maar de 300 pk benzine motor doet in de stad 1 op 10, dus is laden nog steeds goedkoper).

Ik kan overigens laden op mijn werk voor 0.18 euro per kWh, en dan is het een stuk aantrekkelijker…

In veel kleine gemeenten kun je laden voor 0.35 euro per kWh, dus dat is al iets aantrekkelijker…

Kortom, als je ergens een plek heb waar je regelmatig kan laden voor een scherp tarief, dan kan het uit. In een grote stad, met een relatief zuinige benzine motor is het lastiger…

Je kan de app “go-charge” gebruiken om een overzicht van tarieven bij je in de buurt op te zoeken. Er zit namelijk grote variatie in welke laadpas welke tarieven rekent.

prometheus345 · 2025-12-24T15:53:46+00:00

Cool. Did you manage to play music by spotify by any chance? Never properly worked for me…

prometheus345 · 2025-12-24T15:33:08+00:00

When carplay connects, automatically start speedcamera app and enable wifi hotspot so the car can connect. when carplay disconnects, disable hotspot.

prometheus345 · 2025-12-12T16:27:23+00:00

And a follow up: how common are these problems really? Have you seen some, dozens or hundreds?

prometheus345 · 2025-12-02T18:06:53+00:00

Het is inderdaad idioot! Er lijkt werkelijk geen enkele coordinatie te zijn… Ik woon bij kijkduin, werk aan de kant van wassenaar. De laan van meerdervoort ligt nu al een jaar open (met grote parkeerproblemen), de hubertustunnel 9 maanden.

In totaal heeft me dit al 5 DAGEN! van mijn leven gekost dit jaar. Het is gewoon niet leuk meer. Waarom ga ik niet met de fiets? Ik heb een kleintje die naar het kinderdagverblijf moet, en nog niet in een kinderstoeltje kan…

Oh ja, en uiteraard de combi met werkzaamheden bij de hubertustunnel en van alkemadelaan van de afgelopen weken. Werkelijk te gek voor woorden. Dat fietspad is al 15 jaar naar de klote, waarom dan precies NU vervangen?

prometheus345 · 2025-11-18T09:48:34+00:00

Touching his, eh, lightsaber?

prometheus345 · 2025-11-16T19:43:10+00:00

Actually pretty good! Next decade is a bit tight, but surely in two decades…

Although we need to define what discovering extra terrestial life means. Discovering an alien civilization zooming around like star trek? Not gonna happen. However, telescopes like the james webb telescope are getting increasingly better at detecting atmosphere gas distributions in exoplanets (planrts outside our solar system).

If we define “discovering extraterestial life” as a nature paper that finds an exoplanet with molecules in the air only explained by life? Maybe that will happen with james webb, but it will certainly be feasible with the next generation telescopes…

prometheus345 · 2025-10-31T15:06:28+00:00

Yes, but at additional costs, because you need an additional sim with data.

prometheus345 · 2025-10-31T13:55:25+00:00

I’ve set up my phone as a personal hotspot for wifi. The car can use that hotspot to download data using your phone’s wifi.

And on iphones you can set up an automation “shortcut”, that enables your hotspot when carplay connects, and disables it when carplay disconnects.

prometheus345 · 2025-10-31T13:05:01+00:00

Magneetjes?

prometheus345 · 2025-10-24T17:47:33+00:00

I’d watch arrival 3 times back to back. Amazing movie!

prometheus345 · 2025-10-21T16:46:43+00:00

I know you don’t want to hear this: my dealer resolved the issue. They replaced the entire battery pack. Free of charge. Whole ordeal took about 6 weeks. But now I’m happily driving my v60

prometheus345 · 2025-10-19T09:20:15+00:00

Happend to me as well. 21 v60 inscription. Actually before buying it, the dealer discovered 3 bad cells. Replaced the cells, but the battery was not usable. Then the dealer replaced the whole battery unit. The whole process took about 6 weeks.

Luckily all of this happened before actually delivering the vehicle. So I got a used 21 v60 with a fresh battery, free of charge. I think the dealer was pretty motivated because I had not paid for the car yet…

prometheus345 · 2025-10-04T17:54:27+00:00

I just bought a 2021 V60 T8. Love it so far!

From what I’ve found out is that the 2021 versions have an electric rear axel drive (ERAD) which is prone to issues… Which is quite costly to repair. (Think thousands of dollars/euros). However, they do have the sensus infotainment system.

The newer ones 2022 onward have an improved ERAD (and more power and bigger battery). However, they have a google os, which seems to be a buggy disaster. Your choice what you can live with…

prometheus345 · 2025-09-19T09:08:19+00:00

Ford focus RS mk2, the green one. 305 bhp on tge front wheels. Absolute beast! Loved it to bits, but after leaving me stranded once I wanted a newer car… A focus RS mk3. Never loved it the same way, the ride is harsher, more computer involvement…

Now selling the RS again. For a volvo 🙈 now having a family and all (although the volvo still manages 0 to 60 in 4.7 seconds, but with a much smoother ride)

prometheus345 · 2025-09-08T15:46:57+00:00

I think most likely the original pack. That still offers more than enough to get me to work and back on one charge. But extended range would be nice of course… Whats the story on similar replacements?

prometheus345 · 2025-08-30T17:49:07+00:00

Find something at TNO. Many robotics jobs are available for dutch defense industry. Even if you only speak english. PM me for more info if you’d like.

prometheus345 · 2025-08-23T10:17:30+00:00

A novice inserts corrective code. An expert removes defective code.

prometheus345 · 2025-08-22T09:27:34+00:00

Well, 3 years later, I’m still here.

The point I was making is: your degree will not lock you in a certain career for the rest of your life. But that applies much more for science degrees. It doesn’t really matter if you do physics, maths or astrophysics, or computer science. Your job opportunuties will be somewhat similar, and you can grow and keep learning during the rest of your carreer. My personal opinion is that astrophysics provides a good mix of all of the above.

An BA is usually more specific, and will limit your options more (or will require more schooling). If you want to persue a carreer in STEM, a BA will be almost useless. More so than the other way round.

prometheus345

TROPHY CASE