Science of NFL Football - Projectile Motion & Parabolas

submitted by: nsf
"Science of NFL Football" is a 10-part video series funded by the National Science Foundation and produced in partnership with the National Football League. In this segment, NBC's Lester Holt looks at the science of projectile motion and parabolas with the help of former NFL punter Craig Hentrich. NSF-funded scientists Professor Jim Gates from the University of Maryland, Professor John Ziegert of Clemson University, and Professor Rhonda Hughes from Bryn Mawr College, explain the...

The d'Alembertian and Maxwell's equations

submitted by: cloudmichael
The d'Alembertian is a linear second order differential operator, typically in four independant variables. The time-independant version (in three independent (space) variables is called the Laplacian operator. When it's action on a function or vector vanishes, the resulting equation is called the wave equation (or Laplace's equation). When it's action is identified with a non-zero function (or vector function) the resulting equation is called Poisson's equation. This equation is fundamental...