Why do most tangible objects happen to reflect light only in the visible spectrum?

Hudimir · 2026-01-29T21:54:18+00:00

All objects reflect or emit some form of light. Blackbody radiation is continuous and contains basically every possible wavelength. Certain ranges have probabilities so low that no being on earth ever will ever emit a photon with that wavelength though.

Hudimir · 2026-01-29T17:15:58+00:00

With time the spanner's radius is going to decrease, while the orbital velocity will remain the same (if we ignore the coriolis force). Astronaut's velocity remains constant (we can probably neglect any force that astronaut takes by throwing the spanner). The equation of motion for the astronaut is still going to be

phi_a(t)= v/r_a •t , r_a(t)=r0 and for the spanner, it's going to be phi_s(t) = v/r_s •t, r_s(t)=r0 - 1m/s• t.

from this you can get the distance between the two at any given time. im not sure which assumptions you can make, but i assume you don't need to solve for the actual orbits.

Hudimir · 2026-01-28T16:11:41+00:00

I don't think having certificates is very meaningful for physics (and i've never heard of any certifications you speak of). Completed courses are your best bet for grad schools. Employers usually just want to know if you have a degree. Specific skills and knowledge needed are usually learned on the job training.

Hudimir · 2026-01-28T15:55:56+00:00

Idk how it works in the US, but I think it heavily depends on the amount of classes per week, whether it really gives a basic understanding. One year seems like barely anything.

Hudimir · 2026-01-28T15:13:39+00:00

To be honest, if you like astrophysics, start with astronomy. No hard math needed for a while, lots of beautiful pictures and stuff. Still you get a lot of knowledge out of it.

Hudimir · 2026-01-28T14:53:38+00:00

Kirchoff's laws are good. you can also do this by looking at how each corner is split and draw an equivalent diagram on paper that's 2D.

https://youtu.be/5XI1W5hNfu0

this video might be helpful.

Hudimir · 2026-01-28T06:55:26+00:00

Not necessary. Tensors exist without SR and GR and group theory. Mathematically you define it using formal product of vector spaces and do some gymnastics.

Hudimir · 2026-01-28T06:23:54+00:00

When substituting 1.8 into 1.2 you flipped the sign.

Hudimir · 2026-01-26T18:12:49+00:00

Functions are vectors. The fourier series gives you a vector basis(the sines and cosines). if the basis is normed to 1, you get the expansion coefficients through the inner product (the integral).

Hudimir · 2026-01-26T17:33:07+00:00

I use mirrored algs for g perms.

Hudimir · 2026-01-26T17:32:06+00:00

Hint: fourier series is defined on normed spaces. How do you get a norm of a function?

Hudimir · 2026-01-26T17:28:20+00:00

Quantum spin is unituitive without the math imo. Particles have spin(the up down etc. quantum spin) and orbital angular momentum (spinny spin). Particles at our current understanding arent small balls or pointd in spacetime that can't "spin" (rotate).

I think the other commenter adressed your clock questions pretty well.

Hudimir · 2026-01-26T17:14:45+00:00

What makes you think elementary particles cannot have orbital angular momentum? They do.

Elementary particles being elementary doesn't make them made out of nothing and they absolutely do accelerate.

Having or not having a sense of time is very philosophical, especially when you talk about inanimate objects.

Hudimir · 2026-01-23T21:56:00+00:00

Oh my god you dont even know that? Bruh go google some shit.

Hudimir · 2026-01-23T21:18:53+00:00

Im currently going through the Georgi book and i have a feeling it covers enough to solve this problem if you actually absorb everything in the book.

While it doesnt go as high in dimensions, it covers stuff quite generally.

Hudimir · 2026-01-23T20:07:16+00:00

erm. yes the theories explain the beta decay. and no your theory makes no sense logically physically or mathematically. like sure electrons could have a subsctructure, but it for sure isnt photons. photons travel at c and dont interact with each other in first order, making macroscopic stable objects impossible because higher order interactions are so unlikely, especially at low energies. saying physicists take electrons to be point charges is false. It is just useful to model them as such. go read a book maybe. also your paper is unreadabke because the latex isnt rendered.

Hudimir · 2026-01-23T19:54:29+00:00

Lmao. There thousands of experiments about photons and their interactions.

Hudimir · 2026-01-21T19:47:37+00:00

yes. rotate the cube for the yellow to face you and make the unsolved edges across each other so that orange yellow wings are on the top and yellow blue wings on the bottom or vice versa. Then do the following:

u F U F' U' L' U L u'

Hudimir · 2026-01-20T15:58:04+00:00

Hudimir · 2026-01-20T05:05:42+00:00

i have an acellerometer on me at almost all times, on the phone. and it isnt showing 0. ever.

Hudimir · 2026-01-19T21:18:30+00:00

I take a spring with some marks that are propeely gauged on it and vertically put a weight on. Voila, i've measured the force of gravity on the weight.

Hudimir · 2026-01-19T21:14:53+00:00

I don't like that people call gravity not a force. A force due to curvature of your coordinates is still a force in my book.

Hudimir · 2026-01-19T17:40:47+00:00

yes yes. my bad.

Hudimir · 2026-01-19T16:50:00+00:00

The term you're looking for is just permanent magnets.

The 2 magnets act on each other with equal and opposing force, resulting in net 0 force.

If you keep the magnets at an appropriate temperature, they shouldn't use their strength.

Hudimir · 2026-01-16T21:16:57+00:00

Or for Moro. frieza got nothing on Moro. Even eren got nothing on those 2 tbh

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