# Read about math and physics | 62 Discussions | Page 1

1. ### I Prerequisite mathematics for intermediate mechanics?

I will be taking intermediate mechanics next semester, and am a bit concerned about potential gaps in my mathematical knowledge. Long story short, I used to be a physics major, switched to electrical engineering, and then decided to double major after a semester in EE. The issue is that, as a...

3. ### B Who invented electric potential and why?

Why was that concept necessary ?, I know there's also a gravitational equivalent of this concept I couldn't find anything on google Thanks Daniel
4. ### Need some help with a fictional math equation

Okay so I recently found out that in official canon, the Galactic Republic of Star Wars was founded 25,000 years before the first original movie. Hyperdrives were presumably invented around 25,000 BBY. By the time of the Phantom Menace which is in the year 32 BBY, Technology has stayed basically...
5. ### The applications of eigenvectors and eigenvalues | That thing you heard in Endgame has other uses

Zach Star gives an explanation of Eigenvalues and Eigenvectors, with some applications
6. ### Other Textbook Recommendation

Hello there, do you guys have recommendations for math textbooks that i should have? The math is of course related to physics, I mean the maths that a physics student must know.
7. ### Math Switching from science PhD to math BS???

Hello, TL;DR: Could it be practical to leave a PhD in earth science in order to earn a BS in math (starting at the upper division level) if I'm tired of having a spotty math foundation and want to be able to learn anything? I've been on a slow, wandering path towards a vaguely defined "career...
8. ### Cauchy-Riemann Theorem Example in Physics

I was thinking of the wavefunction in QM but I'm not sure how it's used and when.
9. ### I Hypothetical Eclipse Calculation

Hypothetical: Approximately how far from earth would a star the size of the sun have to be for an object the size of a quantum particle to cause a total eclipse of that star when orbiting the earth at a distance equal to that of earth to the center fro the moon?
10. ### B Quantum total eclipse of the sun?

This might be total nonsense, but the thought popped into my head while I was trying to get to sleep, so I thought I see if I could find any advanced help with the following hypothetical: If light were instantaneous, how far from earth would the sun have to be to cause a quark orbiting in place...
11. ### Studying Need some advice: dive straight into physics, or do math first?

Hello, So, I'm looking for some advice from people here who have experience studying physics outside of an academic program. Recently, I've started Griffiths E&M. Although it hasn't been long, I've been having an absolute blast: like, heart-fluttering, "helping me with suicidal depression"...
12. ### Programs Pure maths or applied maths as a second major to physics

I am currently in my second year of studying a bachelor in physics and applied maths. My aim is to one day do research in physics. I am particularly interested in subjects such as gauge theories, AdS/CFT and gravity. My question is whether it would be more beneficial to switch from studying...
13. ### What's the use of unit vectors?

Homework Statement: Hallo. Can somebody explain to me what's the importance-use of unit vector in the below (second) equation? Why isn't the first equation just enough to describe r? What's the reason for unit vector to even exist? Homework Equations: in the photos
14. ### Math behind the Fresnel lens

Homework Statement: what is the mathematical explanation for fresnel lenses Homework Equations: No equations were provided I'm gonna post a link to one article I found that I think has the answer, but I couldn't understand because of my lack of knowledge in physics and math...
15. ### A Is there any theory that can be modeled in any type of space?

Is there any theory in physics that can be modelled in any type of space (Hilbert space, Euclidean, Non-Euclidean...etc)? And if yes, could that theory also contain/be compatible with all types of (physical) symmetries?
16. ### B What is in a Jumping Ball?

I am a beginner and I know a little bit of Math. Can anyone tell me what concepts in Math do I need to know to see one ball jumping in space? I need names of the concepts which lets me realize this Jumping Ball. Thanks.
17. ### Programs What math subjects should a physics major master?

Throughout a degree as a physics major, you take a bunch of math courses, and it's safe to say that you should have a good understanding of all the calculus and algebra courses. But what math subject/specific course should I master at a spiritual level? Especially ones that are needed for...
18. ### Admissions Maximizing the "goodness" of a recommendation letter

Hello everyone, since recommendation letters are usually important when applying for graduate studies, I'd like to ask the following: What do you guys think of the statement 'The best way to maximize the "goodnes" of your recommendation letter is by not caring about it' ? I guess it's...
19. ### How do I find the intersection of three cones?

Homework Statement tl;dr: looking for a way to find the intersection of three cones. I'm currently working with a team to build a Compton camera and I've taken up the deadly task of image reconstruction. Background Theory: https://en.wikipedia.org/wiki/Compton_scattering For a single Compton...
20. ### Programs Any advice on a double major

So I decided to go for two degrees instead of one so the goal is two associate degrees.One in Physics and the other in Mathematics any one have any advice on the this math heavy course of action I’ have set for myself.
21. ### I How to get a Chaos Sequence from this Equation?

Hi, I have this equation about Rossler system, describe as Eq. 1. Given that the chaotic behavior of the system for parameter values a=b=0.2 and c=5.7. How can I calculate the chaotic sequence for this equation below. The equation also referred from...
22. ### Is it possible to express friction force as a tensor?

Homework Statement Consider the equation for the friction force Ff = m FN. is it possible to express the friction force as a tensor? If so, what rank tensor is it, and what are the ranks of the tensor m and the normal force FN? Homework Equations Ff = mFN The Attempt at a Solution [/B] So...
23. ### Curious about Work done by Gravitational force

Homework Statement I don’t understand why this would relate to cosine and not sine, if gravity is often assiciated in the up and down part of a free body diagram. Homework Equations Wg=mgdcos(theta)[/B] The Attempt at a Solution Is it because it would depend on your reference frame?
24. ### Conditions for the applicability of u-substitution

What are the conditions for applicability of u-substitution, i.e. when does it not work? Note that I'm not asking when is it a bad idea (that won't get you any closer to evaluating the integral), but are there any conditions that cause u-sub to yield wrong answers? I started running into what I...
25. ### What math is used the most in cosmology/astrophysics?

Considering one is taking all the required math courses for a typical physics degree, what math electives are most crucial to the field of cosmology/theoretical astrophysics? Also, is it true that mathematical modeling courses(discrete and dynamical modeling across physics) are more important to...
26. ### Intro Physics Level of Math Required for Young’s University Physics

I am a high school student who is planning to start Young and Freedman’s University Physics out of personal interest. However, I am not sure what level of math is required for the book. I haven’t learnt Calculus yet, so I’m planning to study Strang’s Calculus alongside Young’s University...
27. ### I What math topics should one master for first year physics?

I’ll be taking the year long physics sequence at my college this fall and I want to know what specific math topics I should master, so that I can conquer my first year of physics. I’m planning to brush-up on any necessary topics from algebra, through precalc, and including calc 1. It’s an honors...
28. ### Courses Figuring out which (undergrad) classes to take

I have spent the past few months incredibly conflicted. I just finished my freshman year of undergrad (at a 4-year American university) and I have discovered Biophysics, a field which I really want to pursue. However, I still love math and want to continue with my Applied Math major. I'm afraid...
29. ### B What do I need to become an Astrophysicist?

Hi! I just started high school and have developed a passion for cosmology and astrophysics. I would like to know if I really need to be very good at physics and mathematics (and if there is more that I need to be good at) and where do i find a job (spaces like N.A.S.A., SpaceX etc). Thanks for help!
30. ### Scattering angle in relativistic kinematics

Homework Statement Considering 2 scattering particles with momenta ##p_{1}, p_{2}##, where ##p_{2} = 0## in the Lab reference. The momenta of these 2 particles after elastic collision are ##p_{1}', p_{2}'##, respectively. Due to the 4-momentum relation, we have ##p_{1i}p_{1}^{'i} = e_{1}e_{1}'...