Yeah, quantum mechanics lingo: measurement = interaction
Yeah, quantum mechanics lingo: measurement = interaction
Actually a good point, tho. And also a good thought: If there is no special direction, what would be up? And that’s where quantum mechanics gets even weirder: It’s either up or down in the direction you measure.
The technical term you’re looking for is “almost all” prime numbers. Not joking btw.
I had to derive osmotic pressure for my statistical mechanics exam in my bachelor’s. So in what sense don’t we know?
At least cosmology does use some serious quantum physics, even quantum field theory. Source: took 1 year of theoretical cosmology lectures.
They weren’t talking about radioactive decay, electrons are stable. They were talking about electrically charged particles emitting electromagnetic radiation when accelerated. (Circular movement is accelerated, see centripetal force) Since they use energy for this, they would very quickly fall into the nucleus (if I remember correctly, in around 10^-14 s).
Bodies with mass also emit gravitational waves when accelerated, but much less.
I’m not trying to argue approximations. Physics is just approximations all the way down. But as a physicist, I also love arguing about technicalities, and that’s also kinda the point of science communities for me.
But the point of general relativity is that a free-floating observer is equivalent to an observer in free space. That means that falling due to gravity, which you call a force, is an unaccelerated movement, i.e. no force.
In our current understanding of physics, it’s an effect from the curvature of space and not a force. Quantizing gravity results in unphysical divergences. Whether there will be a way to model gravity as an exchange of particles, we can’t know for sure. So according to our current knowledge, it’s not a force.
Well, firstly, we can quantize gravity pretty easily, it just has unphysical divergences.
But secondly, I think it makes most sense to talk about the current accepted physics because we don’t know how quantum gravity will work.
Gravity isn’t a force tho…
The only thing I quickly found is this paper, which says that learning multiple things is not better nor worse than one thing at a time, but it also states in the abstract that cognitive psychologists believed up to that point that mixing multiple topics is beneficial.
That is actually not backed by science. Mixing material is a lot more effective than focusing on one thing.
I think you just have to differentiate whether you want to do mathematically rigorous QM (which gets arbitrarily hard), or just do useful calculations.
Well, when you get to Lie groups, it gets a lot harder. But generally I agree, nonrelativistic quantum mechanics is mathematically not that hard.
There’s also WYGIWYW (“What You Get Is What You Want”) and is primarily used for latex, because you give up some manual control for a (allegedly) better looking result.
CP symmetry has been experimentally measured to be violated. What we still believe is that our world is invariant under CPT symmetry.
Correction: It’s Sagittarius A*
to me it feels like keeping distance instead of having a good relationship, only second to “sir”.
Just to add some formality to this, the original commenter might want to look up the shell theorem for classical mechanics and Birkhoff’s theorem for general relativity.