In basic circular motion in physics we are given the following equation for the centripetal acceleration on a body moving in circular motion: However how can this be proved? Well, acceleration is a vector- so what we need to know is it’s magnitude and direction. The second part of which is obvious, it’s in the […]

### Proving the Volume of a Sphere (Cylindrical Co-ordinates feat. triple integrals)

We are always taught that the volume of a sphere is 4/3πr^3 at school. But how can this be proved? One of the ways is to use cylindrical co-ordinates and integrate over suitable ranges in each of this co-ordinate system’s dimensions. But before we can do this, what are cylindrical co-ordinates? Cylindrical co-ordinates is similar […]

### Schwarzschild radius – Classical Derivation

If you want to derive the Schwarzschild radius for a given body, without mastering linear algebra and tensor mathematics – don’t fear. There is a classical method, that gets to the right answer. No need to delve into the Schwarzschild metric, when you have trusty old Newton. **Disclaimer- If you can always do this derivation the […]

### The Exponential Function – Why so useful?

An exponential function is a function where the input variable (usually written as x) is an exponent. Functions with constants in the exponent are also considered exponential functions. Then what is so amazing about these exponential functions? It all comes down to the rate of change of such a function (also known as the derivative […]

### Simple Time Dilation Derivation | Special Relativity

As I was interested I decided to derive the time dilation equation. My video if you’re interested in doing so yourself is linked here. To begin with I took 2 observers, one stationary and one moving. Both use a photon clock to measure the passage of time. It’s just two parallel plates, when a photon […]