Do lit up light bulbs or stars reflect light?
Yes, but not much. Their spectra is overwhelmingly due to internal energies, not reflection.
If I may suggest, you might look up what a back body actually is. The physics I studied does not describe the Sun as a black body.
Nor did I. The majority of my post went into describing how a black body is a mathematical ideal for which there is no real instance, and that the Sun and the CMBR are
good examples of black bodies. I also cited the Sun's spectrum to show how it resembles, quite closely, a black body of equal temperature.
Its been my understanding that a black body is defined as an object that absorbs 100% of the electromagnetic spectrum, although there are no true black bodies. I understand the relationship between temperature and black body spectrum, but is that the same a black body? Just asking, I'm completely open to learning.
A true black body absorbs all incident photons, and thus any light emitted is from its own temperature. The Sun, by virtue of being so bright, is effectively a black body - its spectrum is overwhelmingly made up of its 'own' photons, rather than those reflected from elsewhere.
Why can't I believe it's not butter?
Religious indoctrination and/or atheistic secular feminism. Take your pick
Why was Physics class an elective in high school? It seems pretty important...
I'm not sure what it means for a class to be "an elective in high school" (it's probably a US thing), but physics (and science in general) are pretty important subjects. Our world is built on science and technology, and understanding its basis lets you go pretty far in the world.
The reason is that the way Phusics is taight requires good mathe skills.
The schools need to change this, and teach a non math Pgysics or use the Truabgulation System that avoids Algebra.
Why? Physics is the study of the fundamental rules of how and why the universe operates as it does, and the universe operates mathematically. Objecting to the heavy mathematical basis of physics is like objecting to the heavy atomic basis of modern chemistry - yes, that's now how people in Ye Olden Days did it, but we now know more than them, and atoms are the fundamental unit of chemistry. Likewise, mathematics is the fundamental unit of physics.
Though something tells me your objection to the way physics is taught isn't due to some revolutionary insight into educational reform - I think it's more likely you couldn't understand the mathematics involved, so objected to their very presence.
does a black hole have a pressure density?
The internal mechanics of black holes are a bit sticky. GR and QM don't agree when it comes to black holes, so I personally throw up my hands and say "It's as dense as can be, and that's good enough".
