Recent content by steve0606

Sorry, I should also mention that I'm studying theoretical physics (not mathematics).

Hi there. Can anybody recommend a good textbook for an undergraduate wanting to study group theory (especially representation theory). I'm thinking of reading "visual group theory" by Carter for conceptual understanding but I also need a book to study alongside this that gives a more formal...

Homework Statement Taking k and ω to be constant, ∂z/∂θ and ∂z/∂ф in terms of x and t for the following function z = cos(kx-ωt), where θ=t2-x and ф = x2+t. Homework Equations The Attempt at a Solution I'm finding this difficult as t and x are not stated explicitly. I know how to...

Homework Statement Find all first and second partial derivatives of the following function: z = e^(-ET) where E and T are functions of z. I know how to do partial differentiation, but not when the variables are functions of z? I don't understand - is there some sort of implicit...

I am learing the particle physics bit of my physics course and don't understand how momentum is conserved when a photon produces an electron/positron pair. In the bubble chamber chamber picture here...

For a simple DC motor like this: http://i1-news.softpedia-static.com/images/news2/How-Brushless-DC-Motors-Work-3.jpg Does it reach a constant rotational speed? I know that when a current flows through it, Flemmings Left HAnd rule causes a couple of forces that results in rotation. As...

So what you're saying is that a bird would have a current flowing through it, but because its resistance is much higher than that of the cable, it is negligible. So we may say that it isn't really a proper circuit.

Thanks for your reply. If that's true, why do most people say its because "It doesn't form a complete circuit".

Imagine a circuit with a cell and no resistors. If I connected a resistor to two points in the circuit, would a current flow through it? Does a bird on a power line act like this? Why does it not get electrocuted? Sorry if this is a stupid question - I'm terrible with electronics! :blushing:

Sorry when I say "flat" I actually mean there is no apparent bubble formation. There is gas still in the beer because if I pour a "flat" pint, put into another glass, there is sometimes bubble formation like normal (even if I try this with more than 5 glasses!) Also, if the gas escaped, there is...

Technical question about nucleation of beer!? I work as a barman and am also a physics student. But I just can't seem to get my head around something: I understand that beer (referring to lager really) consists of water with CO2 dissolved in it with other, irrelevant, stuff also. You cannot see...