nirse · HackerTrans

2个月前讨论

Well, the primary particles that hit the atmosphere are mostly protons. They cause avalanche of secondaires that are varied but mostly muons,

nirse

4个月前讨论

I'd recommend listening to Webern's Op. 27, it's a strict 2nd Viennese school 12-tone composition but also very expensive, I love it (although it works better in a concert setting then a recording): https://youtu.be/ZEtqEzPakxA?is=JgbN1lpHF1lxrXOT

nirse

5个月前讨论

Leisure only, there hasn't been commercial traffic on that canal for a long time: https://en.wikipedia.org/wiki/Union_Canal_(Scotland)

nirse

5个月前讨论

That's what you think...

nirse

8个月前讨论

It seems to be more heat resistant?

nirse

去年讨论

Secondary school physics teacher here: The article is conflating power (watt or joule per second) and energy (joule or kilowatt-hour), so any claim they make is nonsense and the article shouldn't be taken seriously. My students make the same mistake all the time but they don't get to publish it :-)

Power is energy per time unit (thus: energy = power x time), so while the power of a lightning strike is very high (~10GW), the overall energy isn't because it only lasts for a very short duration (apparently the duration of a lightning event is hard to define, [1] says about 0,5 seconds, other places mention much shorter durations, ~10us). So if that 10GW lasts for 0,5 seconds, the total energy is 1,4MWh, which is 1/6 to 1/10 of the electrical energy an average American household consumes in a year[2].

[1] https://amt.copernicus.org/articles/16/547/2023/ [2] https://www.eia.gov/energyexplained/use-of-energy/electricit...

nirse

去年讨论

I think it does:

Right at the bottom under Frequently Asked Questions:

  How much lightning would we need to capture to power the entire U.S. electricity grid?

  Merely capturing the energy from 115 lightning strikes would supply all of the U.S.'s annual electricity needs.

nirse

去年讨论

I believe it would be a far greater problem if those people didn't die. Aging populations are a huge problem around the globe and unless we'd improve the quality of life to such a margin that octo- and nonagenarians are able to care for each other, I think we're all better off with people dying of old age.

评论