Recent comments in /f/explainlikeimfive

ScienceIsSexy420 t1_j6orvnh wrote

No, a private entity can refuse you service for any reason they want, except for a few protected reasons. You can refuse service to someone for the attitude, offensive clothing, or because you don't like their face. But you can't do it because you don't like their skin color or sexual orientation. There are some exceptions carved out for religious views, like in the case of sexual orientation, but even the church can't kick you out for your skin color. So it's a hybrid of religious exceptions, and private entities can be selective

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Spiritual_Jaguar4685 t1_j6orsf9 wrote

Planes fly due to two forces, lift which is generated by air traveling across the wing, and thrust which pushes the plan forward. Combine those two and you get flight.

The Earth's rotation doesn't really enter into it because in theory everything Earthy also rotates, including the air in the sky and the plane on the ground. In theory, since the plane and the air in the sky are part of the spinning Earth system it all cancels out and spinning or no spinning, the motion of the Earth doesn't interact with the physics of an air plane.

But of course the air in the sky isn't just spinning with the Earth, we have wind and storms and jetstreams and things like that mean the bulk motion of the air IS important to flight. For example, because of the Jetstream that blows roughly from NYC to Ireland, it takes around 45 minutes longer to fly back to the NYC from Ireland, because you're flying into the wind.

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ScienceIsSexy420 t1_j6orojk wrote

No, they absolutely can, except for a few protected reasons. You can refuse service to someone for the attitude, offensive clothing, or because you don't like their face. But you can't do it because you don't like their skin color or sexual orientation. There are some exceptions carved out for religious views, like in the case of sexual orientation, but even the church can't kick you out for your skin color

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CryonautX t1_j6ori4c wrote

Short answer: It had been decided that light will always move at a specific speed no matter who or what observes light and even time itself would bend to make that be always true.

Long answer: Let's start with understand a bit about relativity. Let's say you're on a train with a friend and your friend gets up and walks towards the bathroom. From your perspective you see your friend moving at about walking speed towards the bathroom. It's not particularly fast. But what about someone outside the train? Let's say a man is standing a safe distance away from the train tracks and your train zooms past this man. This man sees your friend who was walking to the bathroom. From his perspective, she is going really fast and is zooming past the man. Now your friend has 2 speeds. One really fast speed from the perspective of the man outside the train and a slow speed from your perspective. Both speeds are correct and it all depends on what the speed of the observer is. Everyone will have many different speeds just like your friend and that is what relativity is.

But here's the thing. Light is special because it will always have 1 speed: c! No matter who the observer is and how fast the observer moves, light will always move at the same speed(in vacuum) which is a specific number that is roughly about 300 million meters a second. Now obviously this would seem to contradict the earlier point about relativity but here's the magical thing that lets light move at c. The observers looking at light will either have their time sped up or slowed down to make it such that light is moving at c. So if you try to run really really fast to try and catch up to light, light won't appear to have a lower speed, it would still be moving at c by magic because time slows down for you and light will appear to go faster to make it so it moves at c.

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stairway2evan t1_j6orepn wrote

Christian colleges are private entities - since they aren't part of the state, they can kick you out any time for any reason. Students who decide to go there (presumably because their religion is very important to them, or because it's cheaper or more prestigious than an alternative school) are choosing to follow the school's rules.

Don't get me wrong, we can certainly argue that a school's policies are draconian, or out of line with what most modern religions allow or expect of their adult members. But that doesn't mean we can stop a school from setting its own rules (within the bounds of the law), and they'll likely keep doing it as long as people are still signing up to go.

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Arbitrary_Capricious t1_j6or2sg wrote

Because the government is so determined to keep it secret. Not just legitimately secret tests, but things like refusing to confirm the base exists (when it's easily visible from a number of publicly accessible vantage points). When the government acts like that, people are driven by a combination of curiosity, paranoia, and well, basically trolling, to find out what's there. Honestly, if they'd just said what everyone knew--we test secret planes out there, please stay away or we will take action--they'd probably have less of a problem. But when the response to "What are you doing at that base?" Is "What base?" when it is obvious that there is. In fact, a base then you're pretty much inviting conspiracy theories.

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AcusTwinhammer t1_j6or182 wrote

I didn't take the class, it was just a quick summary he gave of part of his class, but if humans are selecting the answers, or even just reviewing and editing the answers, there is going to be some sort of bias--"that's too many Cs in a row," or "there's too many As in this section." Whether or not one specific "SAT tips!" advice or another was actually better, I don't know.

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Any-Broccoli-3911 t1_j6or03c wrote

Because you don't live in a low altitude region most likely, which is normal since most people live a lot more than 1 meter above the sea level and we won't even get an increase of 1 meter by 2100 in most prediction (though we will get close).

Also, most low altitude regions have dikes to block the sea and river from flooding the land.

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breckenridgeback t1_j6oqudf wrote

The air is rotating along with the surface of the Earth. And so is the plane. The movement of a plane is relative to the moving surface.

Except for very near the poles, or a few supersonic aircraft, a plane traveling "west" is in fact still being carried eastward by the Earth's rotation. It's just traveling eastward less quickly, so its position relative to the surface moves westward.

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