Recent comments in /f/explainlikeimfive

homeboi808 t1_j2a8dpo wrote

It would make more sense to state what % battery loss is used per hour or city/highway driving, or total time you can drive for city/highway.

The Leaf advertising 121 MPG means nothing, as I don’t know how many “gallons” a full charge has. My car advertises like 36 MPG city, and with a 12gal tank I know I can drive ~430 miles.

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LochFarquar t1_j2a8c6u wrote

>Still, it's a 95% chance of a guilty verdict.

We've had many people let off of death row from DNA evidence exonerating them. These are the cases that are supposed to be the most scrutinized and the cases where the system is the most certain. And DNA exonerations are only a subset of the people who are actually innocent and on death row -- it would be foolish to think that DNA has caught all of the actual innocence cases.

Why do we have so many exonerations? Because trials are a highly imperfect tool of determining guilt -- police and prosecutors have vastly more resources than public defenders, people tend to trust the system (I think many people agree with your view that prosecutors only bring cases to trial when they're sure), the guy in the jumpsuit and cuffs looks guilty, jurors have a view that an innocent person would testify but defendants almost never testify based on how the rules of evidence work, etc.

If I say, "many defendants who insist on going to trial do so because they are innocent," and your response is "but they're almost all convicted." That only disproves my point if we assume that all convictions are correct, and I don't make that assumption.

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Lithuim t1_j2a5uss wrote

Animal teeth last their entire lifetime, because they starve and die as soon as there’s a problem.

They don’t eat much acidic or sugary foods so rapid decay isn’t all that likely, but they definitely do have problems as they age. It’s a significant cause of mortality among aging carnivores since their teeth are also their primary survival mechanism.

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nstickels t1_j2a53d3 wrote

Blood moves at roughly 3 feet per second through the body. So assuming average height, it’s approximately 1.5 seconds for blood from the foot to go back to the heart, where it is pumped out again throughout the body. This is repeated every single beat your heart is making. Now that cooled blood will be mixing with warmer blood in the heart, but each and every beat after that first 1.5 seconds will be mixing in slightly cooled blood from your foot over and over.

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boytoy421 t1_j2a4zzo wrote

Couldn't you get around that by doing a ground-based acceleration stage? I'm thinking basically a big-ass track on the ground that you could use to accelerate the second stage (using idk magnets, or even just like a detachable rocket sled) So that by the time you ignite the 2nd stage you're already going X speed without the rocket using any fuel? I mean you could also presumably use a big-ass cannon but the acceleration would turn the astronauts into people salsa presumably

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Aussie_Mo_Bro t1_j2a4gi2 wrote

Birds that hop around on the ground evolved to be roosting birds.

They spend most of their time in tree branches.

It is not an efficient mode of locomotion, though, so birds that forage on the ground evolved with longer, thicker legs in order to walk.

The trade off is that they aren't as strong or nimble flyers

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nstickels t1_j2a3wh7 wrote

This right here. Imagine you are on jury duty with 11 other people and you are sequestered, meaning you are not allowed contact to the outside world, you are not allowed to go to work, you aren’t allowed to see your family or friends. And for all of this, you are making a whole $20 per day. These 11 other people all agree the person is guilty, but you don’t agree. They all want to leave. You want to leave. You are the only reason they can’t leave.

So first they are probably going to ask you why you don’t agree. Then you will need to layout why. The others will all go over your reasons and for each reason, try to explain why they disagree. This process will repeat all day every day until you agree with them. Yes, you could hold out for several days to weeks and eventually have it declared a hung jury. In most cases though, instead of having your every thought picked apart and analyzed over and over all day for days on end, you will end up agreeing just to make it stop.

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mmmmmmBacon12345 t1_j2a3g6p wrote

Its a measure of efficiency to allow people to compare the energy consumption, they're rated in MPGe (Miles Per Gallon equivalent)

Why list it as Miles per Gallon instead of kWh/mile or miles/kWh? Because they did some surveying and determined people don't know what a kWh means in terms of their car and found MPG less confusing and consistent with the existing markings

121/91 MPGe city means the Leaf used 0.278 kWh/mile on the city driving test and 0.370 kWh/mile on the highway test

It doesn't directly compare to the costs/CO2 emissions of a gasoline powered vehicle because it doesn't deal with the upstream power generator efficiency but its a start and allows for comparisons of efficiency between electric cars beyond just the stated range which is heavily influenced by overall battery capacity

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