Recent content by moonkey

Got it out Thanks again for your help LCKurtz

I think I might have been reading the question incorrectly (well hopefully). I feel like an idiot. I'll give it a go and hopefully it works out. Thanks LCKurtz

I don't know what F is

Homework Statement Let C be a simple closed plane curve in space. Let n = ai+bj+ck be a unit vector normal to the plane of C and let the direction on C match that of n. Prove that (1/2)∫[(bz-cy)dx+(cx-az)dy+(ay-bx)dz] equals the plane area enclosed by C. What does the integral reduce...

Homework Statement In a volume V, enclosed by a surface S, the vector fields X and Y satisfy the coupled equations ∇×∇×X=X+Y ∇×∇×Y=Y−X If the values of ∇×X and ∇×Y are given on S, show that X and Y are unique in V. Homework Equations ∇.(A×B)=B.(∇×A)−A.(∇×B)...

Thanks rude man

Homework Statement I'm doing a physics lab that involves an inverting amplifier. I'm pretty crap when it comes to electronics. I've discovered that the output voltage won't go past 8Vrms. The amplifier is like the one here...

That makes perfectly good sense. Thanks Quinzio

Homework Statement I have exams coming up and I'm just looking for an idea of when relativity should be taken into account. For example I'm just going over a question involving photoelectric effect and potential fields and de Broglie and all that jazz and the final velocity of the electron...

Homework Statement I have exams coming up and I'm just looking for an idea of when relativity should be taken into account. For example I'm just going over a question involving photoelectric effect and potential fields and de Broglie and all that jazz and the final velocity of the electron...

Homework Statement (b) For a mass m1 in circular orbit with velocity v1, and a mass m2 orbiting with velocity v2 (about a common center of mass), the following holds: m1/m2 = v2/v1. Use this relation to derive an expression relating the mass and velocity of a star with the period and mass...

Homework Statement (2) A star orbits the centre of our Galaxy in a plane perpendicular to our line of sight. If the angular speed of this star in the sky is 40 mas (milli-arc-seconds) per year, calculate its velocity. Assume that the distance of the Galactic centre is 8 kpc. (3) If the...

Thank you very much for the reply. Helped a lot

Homework Statement (1) A Physics lecturer, on a dark night, shines his laser pointer towards the star Vega. (a) Roughly, how many optical photons from the Sun per second enter the eye of an astronomer standing on a planet orbiting Vega ? Assume that 50 % of the light from the Sun is...

Hi all, Doing a project for 1st year special topics physics module in university and we're thinking of doing the project on stars. Just wondering if anyone might know of any good literature on the sublject that we could look into as part of our research. We have until mid January to do the...