BillWoods6
BillWoods6 t1_jeg5gdu wrote
It takes the Earth 24 hours to turn on its axis once. Or, as it seems to us, for the Sun to go across the sky and come back around. So at points 15 degrees apart in longitude, solar noon will occur an hour apart.
On the equator, the Earth is about 40,000 km around. So at points 1 km apart, solar noon will occur 2.16 seconds apart.
BillWoods6 t1_je295xg wrote
Reply to comment by DarkAlman in eli5: How did people build bridges over deep and/or dangerous water if they didn't have the equipment to go under water? by Internetscraperds9
> Suspension bridges at a basic level only required a rope to be pulled across a river, and that can easily be done with a boat.
Or by other methods.
> Ellet's brainstorming sessions with his men raised several ideas that could enable a line to be suspended across the gorge; these included firing cannonballs with the line attached, towing it across the river with a steamer, and tying it to a rocket that would then be launched across the gorge. ... Ellet also took the opportunity to generate publicity for his project. Organizing a kite-flying contest, he offered $5[nb 6] to any boy who flew a kite across the gorge and secured the kite string to the other side.[23]
https://en.wikipedia.org/wiki/Niagara_Falls_Suspension_Bridge#Charles_Ellet_Jr.'s_temporary_bridge
BillWoods6 t1_jaf1sim wrote
Reply to comment by breckenridgeback in ELI5: Does a volcano have a 'floor' under the lava? or does it go straight to the centre of the earth? by _zobi1kenobi
It's liquid enough to circulate somewhat, dragging the more-solid slabs of the lithosphere around the surface of the Earth.
BillWoods6 t1_j98l2k4 wrote
Reply to comment by fiendishrabbit in Eli5 How does nuclear fuel get spent so fast? by Vegetable_Noise_1124
> Basically a radioactive element that has been arranged to encourage it to just react a little bit faster.
They don't; there's no way to do that. RTGs just use isotopes that decay pretty quickly. Notably plutonium-238, which has a half-life of only 88 years.
BillWoods6 t1_j9747gw wrote
Uranium-235's half-life is 700 million years. It's not even warm to the touch. Fissioning it releases much more energy than it would decaying to lead, and much, much, much faster. So that's useful for human purposes.
I wouldn't say it's a large amount of spent fuel, considering the amount of energy released. Each fuel pellet -- the size of a fingertip -- releases about as much a ton of coal.
BillWoods6 t1_j2ekdxq wrote
Reply to comment by Kay_Kay_Bee in ELI5 why do people refer to it as the pacific northwest rather than simply the northwest? by Longshot_Louie
Keep it simple -- just use numbers. I mean, there's an infinite number of integers available, so no need for duplication, right?
BillWoods6 t1_iyacrl6 wrote
Reply to comment by [deleted] in Eli5: How big of a problem is the extreme demographic change in Japan? by I_Tory_I
> Also, there's an easy fix by just allowing migration into Japan.
For Japan, that's not easy. A mono-ethnic country that wants to stay that way, a written language that's hard to learn.
BillWoods6 t1_ix4uw5b wrote
Reply to comment by ZookeepergameOwn1726 in eli5 why is 9 the last number? and why then we use 10 and repeat in sets of 10? by anujshr7
> Over time though, base ten has "won" as humans tend to count of their fingers and we have ten of those. Counting with your toes can't have been practical
So the change came when we invented shoes?
BillWoods6 t1_iueelu4 wrote
Reply to comment by FracturedPrincess in Eli5: Anyone who knows their military history. Why was ‘going over the top’ used in WW1? by [deleted]
Basically, they found themselves in a siege on a continental scale.
BillWoods6 t1_iua4wl1 wrote
Reply to Eli5: Anyone who knows their military history. Why was ‘going over the top’ used in WW1? by [deleted]
If one side wanted to attack the other, the better option would have been to go around the flank of the other's entrenched position. But the trenchworks had been extended from the sea coast to Switzerland. So....
BillWoods6 t1_iu5640k wrote
Reply to comment by Yancy_Farnesworth in ELI5: Does a nuclear explosion make other atoms radioactive or simply contaminates it? by Sklifosovsky20
> Hydrogen is stable and not radioactive with 1 or 2 neutrons.
You meant 0 or 1 neutrons.
BillWoods6 t1_its90wu wrote
Reply to comment by nednobbins in Eli5: I don't understand why there seems to be a general consensus that gdp will continue a trend of growth, and why this would be beneficial, considering the cyclical nature of economies and empires rising and falling. Isn't economic downturn on some level unavoidable or even beneficial? by candymannequin
> ... the world population has increased by nearly 100x since then and growth seems to be accelerating rather than slowing down.
It isn't.
> Peak population growth was reached in 1968 with an annual growth of 2.1%. Since then the increase of the world population has slowed and today grows by just over 1% per year.
Ironically, 1968 is also the year The Population Bomb was published.
> By the end of the century – when global population growth will have fallen to 0.1% according to the UN’s projection – the world will be very close to the end of the demographic transition.
BillWoods6 t1_jegn5ci wrote
Reply to ELI5: What actually happens when you call your representatives? by glitterismyantidrug_
Your representative ('s staff) will take note of your opinion, but more-or-less in proportion to the effort you make.