Chandra is the unsung hero of space telescopes. Far better known is the Hubble Space Telescope, which is rightly famous for the spectacular images it has produced. But Hubble was only ever intended to be one arm of a four-pronged approach to astronomical observations, another of which is provided by Chandra. Whereas Hubble produces images … Continue reading Chandra: the Universe as seen in X-rays
Key Facts: Waves
We can define a wave as something that carries energy from one place to another without the transfer of physical matter. To understand this definition it is useful to think about two different ways of feeling heat. In a shower, heat is created by an energy exchange inside the storage tank or shower unit and … Continue reading Key Facts: Waves
Electric Motors
Having covered Fleming's Left-Hand Rule previously, we will now apply its general principles to the specific application of an electric motor. In particular, we will look at how the sideways motion due to a linear force, as predicted in Fleming's Left-Hand Rule, can be used to produce continuous rotation. We will be focusing on a … Continue reading Electric Motors
Resultant Forces (part 3)
In the final part of this mini-series, we have to deal with situations where the two component forces are neither opposite nor at right angles; the forces are simply at some general angle to each other. Typical situations where this could apply in real life are tugs pulling a ship or an airplane flying through … Continue reading Resultant Forces (part 3)
Kinetic Theory
Scientific theories are constructs (models) that we use to explain our observations. They are different from scientific laws, which are rules that have to be obeyed and which can be applied across a wide variety of situations. The best known example is the Big Bang Theory but we'll be looking at a theory that relates … Continue reading Kinetic Theory
Sound waves and sonic booms
When an object moves through the air, the noise it creates spreads out in all directions, moving away in waves that travel at the speed of sound. But what happens when the object is moving faster than the speed of sound? In this case, the sound waves that are trying to move ahead get overtaken … Continue reading Sound waves and sonic booms
Online Astronomy Resources
There are many great resources available online to support your learning in the astronomy module of the course. In this post, which I'll update as we go along, I'm going to list a few of my personal favourites, some of which link directly to the required course content but others are included as a way … Continue reading Online Astronomy Resources
Mr Tarrant's physbang 'blog 