Physics Forums

I would like to explain to someone about why the Sun's gravity does not pull the Earth into the Sun. I know that the reason that the Sun's gravity does not pull the Earth into the Sun is that the momentum of the Earth orbiting the Sun is in equilibrium with the Sun's gravity. What I need to... Read more

I tried to simulate a circuit from MIT Power Electronics Lecture 2, and this is the simulation when it has reached periodic steady state. I added ground, original circuit didn't have one. Yellow line - v(vy, vz) - should be voltage across inductor L2. I know that the negative... Read more

I would like to explain to someone about why the Sun's gravity does not pull the Earth into the Sun. I know that the reason that the Sun's gravity does not pull the Earth into the Sun is that the momentum of the Earth orbiting the Sun is in equilibrium with the Sun's gravity. What I need to... Read more

I took 1 semester course sequences and did independent research. I still get research ideas but I am not as sharp as I used to be.

TL;DR: This thread is a review of the book Our Mathematical Universe. This thread is a review of Max Tegmark's book Our Mathematical Universe. The thesis of Our Mathematical Universe is that not only does mathematics perfectly describe the universe, the universe is mathematics.. In... Read more

Been working through some advanced calc problems and the definition of continuity keeps feeling kinda weird. The epsilon-delta thing doesn't quite click intuitively for all cases, especially with those piecewise functions. Seems like there's a persistent disconnect between the formal proof and... Read more

Hello everyone, As a freshman Physics student, I plan to learn MCNP and improve my skills in this field over the summer break. This might not be the ideal place to ask, but I am currently looking for a laptop that can smoothly run MCNP for this purpose. My main question is regarding the... Read more

Hi everyone Einstein mathematical theory suggests that wormhole are found inside a blackhole in a quantum foam and more therefore the universe doesn't have an edge because to create a wormhole you would need to fold something and to fold something you would need edges and if einstein's math is... Read more

I solved gravity After deconstructing the complexities of general relativity and tensor calculus, I have developed a single, unified F= equation that accurately calculates gravitational force across all environments from gravitational orbits to Mercury's precession, and super massive... Read more

In the figure below of a semi-circle, show that ##h=\sqrt{ab}##. In the special case where ##a=1##, then ##h=\sqrt{b}##. A complete discussion can be found in chapter 2 of the book An Imaginary Tale by Paul J. Nahin.

Hello, I have tried to implement an open circuit microstrip resonator . I got the microstrip resonating at 5Ghz as shown below. However the S-parameters is very bad. Is there a way to improve the matching so It will have a better dip in 5GHz. ... Read more

Hello, I have tried to implement an open circuit microstrip resonator . I got the microstrip resonating at 5Ghz as shown below. However the S-parameters is very bad. Is there a way to improve the matching so It will have a better dip in 5GHz. ... Read more

dsbarclay - 0 - 0 - How did you find PF? - google search I am a graduate level engineer interested in physics. There's no easy way to say this, but your other post will be deleted by the moderators in due course. In fact, it's gone already.dsbarclay said:How did you find PF?: google search I am a graduate level engineer interested in …

I am a recent M.Sc. Mathematics and Data Science student in India, currently in my first semester. The course is challenging and rewarding, especially coming from a non-traditional mathematics background. Current modules include Real Analysis, Linear Algebra, Probability and Statistics... Read more

Consider a vector-like lattice gauge theory whose fermion content has Weyl number ≡ 0 (mod 16) i.e. anomaly-free in the sense that admits symmetric mass generation, the 16 of SO(10) / one SM generation being the canonical example tuned near the lower edge of the conformal window. Now switch on a... Read more

Consider a vector-like lattice gauge theory whose fermion content has Weyl number ≡ 0 (mod 16) i.e. anomaly-free in the sense that admits symmetric mass generation, the 16 of SO(10) / one SM generation being the canonical example tuned near the lower edge of the conformal window. Now switch on a... Read more

In a recent thread @bhobba suggested the book "Fields and their Quanta" with the hint "It's a bit pricey". I was just wondering what he meant so I looked it up. When I saw the price I was impressed: 160,-€ for around 200 pages. That got me thinking: Any idea what makes this... Read more

I wanted to have a quick check on how Bell's theorem was formulated so consulted the wiki page: https://en.wikipedia.org/wiki/Bell's_theorem But then saw the following odd section: ===== Hypothetical characters Alice and Bob stand in widely separated locations. Their... Read more

I hope I haven't already mentioned this one but I think it was in a personal message. I hate to do this but you have to see this one. The story is intelligent and extremely well thought out. If nothing else then just watch S01E05. Even though it's a cartoon The Matrix doesn't even come near!

1. Abstract & Scope Spontaneous tin whisker growth has been characterized as a catastrophic electronic failure mechanism for over seven decades, with mitigation strategies focusing exclusively on suppression. Recent work has identified intentional nanowire synthesis as a recognized future... Read more