141–150 of 839 posts
Earlier quoted context omitted.
It directs air moving horizontally downwards, by conservation of momentum the wing must get additional upwards momentum, called lift.
That can't be the explanation, otherwise wings wouldn't need to be curved - flat wings could fly, as long as they're tilted to redirect the air.
Why does time slow down/go faster with movement compared to another object. The well known example that if you travel into space you'd gain let's say 5 years and people on earth 25 in the same time or so. I just don't get it and I can't find any logic explanation. For instance: Two twins who came to live exactly at the same moment in the year 2000 and both die on their 75th birthday at the same time. One travels into…
There are two effects here. One is special relativistic time dilation, and you can derive these effects with very little mathematics (high school is enough). The Wikipedia page has a simple proof, but it's important to realise that this is a result of the postulate that the speed of light is constant. If you travel at 0.99c and emit a photon, it still travels at c, not 1.99c. It's absolutely not intuitive why this sh…
If you move away from a clock, time seems to slow down as your distance to the clock gets larger and the time between a change on the clock reaches you over a longer period. But if you carry a clock in your rocket it will just tick at the same pace as on earth (minus the gravitational impact, which is measured but why does gravity have an impact on time...?)
I would like to understand how cellular biology processes actually work. Like, how do all the right modules and proteins line up in the right orientation every time? Every time I watch animations, it seems like the proteins and such just magically appear when needed and disappear when not needed [0]. Sometimes it's an ultra-complex looking protein and it just magically flys over to the DNA, attaches to the correct sp…
Flight. Apparently "air flows faster on the top side of the wing, lowering the pressure" is an incomplete explanation; I even heard we don't completely understand why it works (?!?).
the summary being:
- The vertical velocity of the diverted air is proportional to the speed of the wing and the angle of attack.
- The lift is proportional to the amount of air diverted times the vertical velocity of the air
it also debunks the myth of "air flows faster on the top side of the wing, causing lift"
Earlier quoted context omitted.
Yudkowsky's explanation[1] is the first one that worked for me. I later found Quantum mysteries for anyone[2] helpful. The latter has less soap-boxing. 1: https://www.lesswrong.com/posts/AnHJX42C6r6deohTG/bell-s-the... 2: https://kantin.sabanciuniv.edu/sites/kantin.sabanciuniv.edu/...
I started to read the first one but his insistence that Many Worlds is true was too frustrating. Many Worlds Theorem seems specifically useful at saying "the variables aren't hidden because everything before wavefunction collapses actually plays out in different worlds. But, we specifically have no way of proving that theory. So now we're back to the essence of the original question - if these things seem random why…
If you are properly amazed by it, rejecting MWI or any crazy-ish borderline-conspiracy theory seems suddenly a lot harder.
I feel the whole Yudkowsky's QM series in fact served to deliver that one post.
When two particles get closer, their mutual gravitational attraction increases. As the distance approaches zero, the force approaches infinity. In the limit of d -> 0, the energy released -> infinity. Obviously at some scale the notion of a point mass breaks down, but even quantum theory would be problematic if we think of a wave function as describing a probability distribution, wouldn't it? What's the "official" st…
What follows is very hand-wavy, and the renormalization sibling post may touch on it. An answer is that the d->0 approaches infinity presumes a nice, continuous analytic function. If d->epsilon, you can't get to that singularity. There was an equivalent problem in the E/M space with "The Ultraviolet Catastrophe" [1], which turned out to go away if you assumed quantization. I'm not going to claim this is a perfect ana…
Why bicycles stay upright. For every authoritative-sounding, in-depth explanation, there is an equally plausible, yet conflicting and contradictory alternative.
For example, see "Some recent developments in bicycle dynamics" (2007). Especially the folklore section:
"The world of bicycle dynamics is filled with folklore. For instance, some publications persist in the necessity of positive trail or gyroscopic effect of the wheels for the existence of a forward speed range with uncontrolled stable operation. Here we will show, by means of a counter example,that this is not necessarily the case.
https://pdfs.semanticscholar.org/bb70/d679c5a2ff67dd2a1a51f2...
I would like to understand how cellular biology processes actually work. Like, how do all the right modules and proteins line up in the right orientation every time? Every time I watch animations, it seems like the proteins and such just magically appear when needed and disappear when not needed [0]. Sometimes it's an ultra-complex looking protein and it just magically flys over to the DNA, attaches to the correct sp…
I never really understood what happened really when the guy fell inside it in Interstellar and how come he started seeing all those photos. I just accepted it as Hollywood bs.
I know my question is based on a movie but would still like to know what will someone witness (assuming of course they somehow live)