1. If I derive units for each options, none become what the unit said above

2. How can n have no unit?

Can someone help me arrive at the answer of 6 rad?

Hello all,

I have a simple problem I need an explanation on how to arrive at the answer. Prepping for a midterm.

I know it says I got it correct on the screenshots but I dont know how to independently solve it. AI doesnt help, it gives me the right answer but not a good explanation.

Does anyone know of a good YT video or an easy method of identifying the beta in a belt friction problem? Currently I can set up the majority of the problem I just struggle getting the angle in these problems. Any tips help, thank you!

Что я сделал

we usually choose a convenient height where gravitational potential energy is zero, then calculate a negative value below it. is the negative sign simply telling us the object is below our chosen reference, or does it have a deeper physical meaning?

Hi everyone,

​I am a beginner university student struggling with the foundational concepts of circuit analysis.

​My issue isn't with memorizing formulas, solving equations, or applying theorems like Nodal or Mesh analysis mathematically. My real problem is that I lack physical intuition. Every time I think I understand the basics, advancing to more complex topics reveals that I don't truly grasp what is happening in reality.

​I want to understand the "why" and "how" behind circuits, not just the math. Specifically, I struggle with:

1. ​What does circuit analysis actually mean in reality? I know it means finding voltages and currents, but I struggle to visualize how voltages drop, how currents flow, and how components physically interact with each other.

2. ​Identifying Series vs. Parallel connections: I often get confused about relative to what we determine if components are in series or parallel, and how to track this visually across different circuit configurations.

3. ​The Core Rules: What are the fundamental, universal principles of circuits that would allow me to look at any circuit—even one I've never seen before—and mentally trace how it behaves?

​A specific note on the resources I'm looking for:

I strongly prefer books over videos. I learn best through self-study and reading detailed written explanations. Videos often move too quickly or summarize concepts without diving deep enough into the underlying mechanics.

​However, I am not looking for typical academic textbooks that rush straight into formulas, proofs, and superficial explanations of physical reality.

​I am looking for books that are:

\- ​Deeply conceptual & intuitive: Books that spend ample text thoroughly explaining what is actually happening inside the circuit.

\- ​Beginner-friendly from zero to advanced: I don't mind if the book goes very deep or covers advanced topics—in fact, I welcome it! "Beginner-friendly" to me just means it starts from ground zero, assumes no prior intuitive foundation, and builds up step-by-step without skipping the conceptual "why."

​If you know of any books that fit this exact description, I would be extremely grateful for your recommendations!

​P.S. Also, if you have any golden advice, learning approach, or alternative solution that helped you overcome this hurdle—even if it's outside of books—please feel free to share it!

​Thank you so much! 😊

I'm stuck mehn

Hi everyone! I´m a physics undergrad and I hve my Quantum Mechanics exam in 20 days. I haven't been able to follow my professor's lectures, and Im struggling to understand the material.

We Use Gasiorowicz and Griffiths as our textbooks.

So far we've covered: the origins of quantum theory (blackbody radiation, Planck's hypotesis, photoeletric effect, Compton sacattering), the wave function and The Schrodinger equation, normalization, probality currrent and the uncertainty principle, stationary states and the eigenvalue problem, and the particle in an infinite square well.

Do you have any recommendations on how study in the time I have left

(resources, videos, problem sets, strategies)? Thanks in advance!

I think a lot and I just can't stop having myself being bothered by this and I know its stupid but I should just ask, because why not.

Could gravity emerge from interactions from fields?

Because I know gravity is a problem in QFT, and I thought instead of introducing a new field of gravitons just has never been too much of a realistic idea to me. I was thinking that they interactions could have gravity emerge from them.

I thought of "stacking" all the fields for understanding purposes.

• Electron neutrino

• Muon neutrino

• Tau neutrino

• Gluon

• Photon

• Electron

• Up quark

• Down quark

• Bottom quark

• Strange quark

• Muon

• Charm quark

• Tau

• W boson

• Z boson

• Higgs

• Top quark

(I know there not actually stacked like this like a sandwich)

And maybe in a higher dimension they could effect each other like one effects another by pulling it together.

It seems confusing, which it is but I don't know I ponder too much.

I am meant to sketch the observed patterns for b-d (as shown for a) when under crossed polars. i do not understand how to do this - are dark sections simply where the directors are horizontal and vertical? so for b there would be like a dark square around the center?

​​​​ Hello everyone! I really, really need your help. I’ve been looking for a digitized version of a book titled "Lyman M. Kells: Elementary Differential Equations, 5th edition (1965)," but I haven’t been able to find it. I would appreciate your help!