Recent comments in /f/explainlikeimfive

royalrange t1_iuh6efa wrote

Think of a chunk of crystalline solid. The atoms inside this solid are very ordered, and as such, if there is any small movement or vibration of the atoms, it will propagate as waves. This vibration will have different frequencies/wavelengths and energies associated with it. In quantum mechanics, the energy of waves are discrete and a phonon is just a fancy way of describing one unit of energy of a vibration at a particular frequency/wavelength. At room temperature, you will have many of these waves or phonons in a crystalline solid due to the atoms vibrating a lot.

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frakc t1_iuh672g wrote

There few thing which should be adressed too

Better lubricating oils and steel quality allows engines to opperate on higher power without melting.

Better design of valves. Old valves had ton of space between them and engine walls. Thus lot of conbastion agent were escape prior burning, greatly reducing power. Big distance was important for 2 things. First manufacturing was on much lower level and offset could be big. Second steel quality resulted in high expansion of metal, so it was important to leave space to prevent stacking and wall break

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Flair_Helper t1_iuh4vmn wrote

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nmxt t1_iuh4qpe wrote

I’ll try to go for a true ELI5 here. Life needs oxygen to burn food. Burning food gives living organisms a lot of energy, which they can use to move around, or grow fast, or break up some more food etc. it’s not strictly necessary though, life started out without oxygen, and there are many living things (bacteria and others) today that make do without it. There are other ways to get energy, doing it with oxygen is just much more effective. Organisms like us can’t live without oxygen because we came to rely on it.

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Writerro t1_iuh4dt5 wrote

Linux on servers is not in embedded form, but fully functional, with every feature that regular desktop PC can have, if not more :)

It is the other way if anything - linux on android phones have reduced features available to user, because of permissions et cetera. That's why it's harder to hack android phone, because people there are not installing packages, but using Google play, people there have no root access et cetera.

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wachtwoord123456 t1_iuh3xgm wrote

>So if a government wants to borrow money it issues bonds at a fixed interest rate at a certain maturity date?

Correct. There are other ways a goverment can raise money, but issuing bonds is often seen as a good way to be able to spend more money without causing inflation. A bond is nothing more then "you pay us X now, we will pay Y back in Z years."

>How does it know what to set that rate at?

Goverments have credit ratings (similar to companies). Since a lot of investors use these ratings to decide to buy or not buy their bonds, goverments can use a similar analesys the investors use to decide there interest. Most goverments also have an institution to monitor there economy. These will probably have an inestigation ready with the effects of different interest rates.

>Bonds are sold on the secondary market at market value but that is just between private investors right?

Correct

>How does the secondary market price impact how the government services its debt given they will just offer par 100 at 4%?

The only thing that changes is who the goverment has to pay at the end of the agreed period. The secondary market doesn't change the bond, just the owner. Where it does matter is when they want to issue extra bonds. If on the secondary market your bonds are valued less then expacted new bonds will probably need a higher interest rate to be sold. While if there sold fir more they could lower the rate for New bonds.

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_OBAFGKM_ t1_iuh3es9 wrote

> But does the sun take the same path through the sky if the observer is on the North Pole vs the Equator?

No: if you're on the equator the sun will be directly overhead, if you're at the north pole the sun will always be in the southern part of the sky.

> Also, is there any day / location where the sun rises directly in the east, goes directly overhead, and then sets directly in the west?

The closest you could get to this is being exactly on the equator during an equinox. It's still not perfect, the tilt of the earth makes what you're describing impossible, but it's pretty close.

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Bedlemkrd t1_iuh2vi9 wrote

They do real jousting at the tournament of kings in Las Vegas it's a dinner show once a week. The winning knight from last week gets to sit it out and be the "king" that presides over the event.

They wear full plate and armor pads and the bout is won whe you unseat the opponent. Lances for jousting are blunted and sometimes have something on the end like a fist or square end to give you more force but less pierce. The lances are also designed to break at a certain pressure to also not dismount yourself like you would if it was like a pole vaulting implement.

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rasa2013 t1_iuh2lsx wrote

You've probably heard of "fight or flight response" at some point. Most animals have one. What it really refers to isn't just behavior, it's physiology.

Your body literally has systems dedicated to fight or flight response. In your brain, there are brain regions that activate in response to threat and get your body ready to survive. It's supposed to be functional: if you need to fight or run, you need adrenaline, focused attention, threat awareness, more blood to get to your muscles, and to know you're in danger.

Panic attack is when that response is triggered (where the idea of a trigger comes from) even though there isn't imminent danger from a third party perspective. Sometimes not even from your own perspective.

From the POV of your body, though, it's just trying to protect you. It has associated something with severe threat and it's responding appropriately.

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