# Physics for beginners

... by Matthew Raspanti

#### Images

Shows differential for integrating Biot-Savart Law

File:Rail gun.jpg

Electromagnetic momentum archery analogy

The first four terms of the Fourier series of a square wave, ${\displaystyle \psi (x)={\frac {4}{\pi }}\sin(\pi x)}$  ${\displaystyle +{\frac {4}{3\pi }}\sin(3\pi x)}$  ${\displaystyle +{\frac {4}{5\pi }}\sin(5\pi x)}$  ${\displaystyle +{\frac {4}{7\pi }}\sin(7\pi x)+\ldots }$ ${\displaystyle =\sum _{{\text{odd }}n=1}^{\infty }{\frac {4}{n\pi }}\sin(n\pi x)}$ .

Figure for calculating wave equation for transverse string waves

Five fair coins to illustrate the additive property of Shannon's information entropy

Shannon's entropy for unfair coin

Establishes that 3 items have 3!=6 permutations.

5 choose 3 versus permutation of ordered set of five objects.
List of subpages