Physics Articles, Guides, and Tutorials

Recent

Posterior Predictive Distributions in Bayesian Statistics

Confessions of a moderate Bayesian, part 4 Bayesian statistics by and for non-statisticians Read part 1: How to Get Started with Bayesian Statistics Read part 2: Frequentist Probability vs Bayesian Probability Read part 3: How Bayesian Inference Works in the Context of Science Predictive distributions A predictive distribution is the distribution that we expect for…

How to Use Duality in Computational Electromagnetic Problems

A number of weeks ago I happened across a post that caught my eye. Dale asked a question about the number of photons in an electromagnetic field. His question was answered in full but what caught my attention in the discussion was seeing a familiar friend; the rather odd field combination, ##E+iB## [1]. The impetus…

Equations of Motion Revisited

Introduction In any school Physics course, the Newtonian equations of motion are very much a ‘stock’ item. Students learn the equations and are given a variety of problems which provide practice in determining which equation(s) to use to solve any particular problem. What is perhaps a little surprising is that in general no-one applies the…

How to Master Projectile Motion Without Quadratics

Introduction In a homework thread a while back a PF member expressed dismay along the lines of “oh no, not another boring projectile motion problem.” Admittedly, I shared the member’s sentiments at the time.  Yet after some thought, I concluded that it is the unvarying recommended strategy of the genre that makes it boring: (a)…

Introduction to Electric Vector Potential and Its Applications

Main Point: The electric vector potential offers a  means of determining the non-conservative component of a mixed stationary or quasi-stationary electric field While many are familiar with the static magnetic vector potential ## \bf A = (\mu/4\pi) \int \bf j~ dv/s ## with ## \bf j ## = current (area) density within differential volume ##…

I Know the Math Says so, but Is It Really True?

I’m sure anyone who has hung out long enough here on Physics Forums has encountered threads which go something like this (I’ll use an example based on threads I’ve seen and participated in in the relativity forum, but I’m sure similar things occur in other forums as well): Original Poster: I don’t understand how black…

Does the Block Universe of Physics Mean Time is an Illusion?

I have written many Insights (and coauthored an entire book) explaining how the puzzles, problems, and paradoxes of modern physics can be attributed to our dynamical bias and resolved by rising to Wilczek’s challenge [1]: A recurring theme in natural philosophy is the tension between the God’s-eye [4D] view of reality comprehended as a whole…

Introduction to Pitot-Static Systems in Gliders

Like many others, I have been seeking new and fun things to do during a pandemic.   I decided on the new Microsoft Flight Simulator 2020, but the Condor 2 Soaring Simulator is my intermediate step.  I am certified as a pilot, including gliders, but I have not flown for many years because of the expense.  …

Trending