Recent content by mrneglect

Thank you, this is exactly what I was looking for!

Consider the following object: The exact dimensions are unimportant, but its x, y and z dimensions must not be too similar (so I'm told). I have been told that an object such as the one above will behave strangely when thrown up into the air whilst spinning. If it is sent spinning...

I've got an exam tomorrow, and this is one of the topics I can't get my head around. Any help would be much appreciated. Homework Statement Homework Equations The Attempt at a Solution I've calculated that alpha=4.78x10^9. I understand that a Delta function is a periodic...

Aha, OK, so you can get some pretty low energy photons coming out of atoms, but what about high energy photons out of alternating current? Is there some maximum cut-off there too?

I know that light (such as that emitted by a fluorescent bulb) is generated by electrons falling into lower energy states and releasing an amount of energy as a photon. But radio is transmitted by producing an alternating current in a conductor, and (I assume) it's the acceleration and...

Well for some reason that's not in our course, but I shall certainly be using it from now on!

Oh, I see, so it doesn't wrap around! That's probably why it's "+ i - j + k". Thanks for that. I knew it was something simple. :smile:

Vector Planes & Orthogonality -- Help! I must be doing something really stupid, and I'll kick myself when you point it out, but I'm having difficulty with this question: Find the unit normal to the plane x + 2y – 2z = 15. What is the distance of the plane from the origin? OK, so I know I need...

But how can there be an Earth when the switch is closed when there isn't an Earth anywhere in the circuit? And I don't know why the two waves have different amplitudes; they were held taut and parallel (not on a spool). The equipment looked like this:

Ah, sorry, I wondered if I had posted in the wrong place. Well the reason is that I don't see how closing the switch will force a node. I can understand than an earthed end will force zero volts and thus a node (like wiggling a string which is nailed to a wall), and an open circuit will...

I'll try to make this as concise as possible. I'm trying to get my head around how signals behave in coaxial cables. If you set up a circuit like this: Then the earthed end will force a node at that end, right? So you'll end up with your reflections having a phase shift of pi and looking...