Recent content by alex_b93

Homework Statement Using the Reissner Nordstrom line element, which I've given in the relevant equations section, I'm looking to show that the time like Geodesics obey the equation again show below. Homework Equations Line Element[/B] ##ds^2= - U(r)c^2dt^2 +\frac{dr^2}{U(r)} +r^2(d\theta^2 +...

Hi, I was wondering if anyone could help with this problem that I am stuck on? Homework Statement I need to work out a formula for the irradiance(intensity) as a function of the distance for a LLoyd's mirror interference arrangement. The question suggests considering the similarities...

Can anyone help at all?

Hi, Was wondering if I could get some help with part b of this question? I've attached the question and my attempt in the pictures as there was a lot of data and writing, so thought this would be the easiest way. With my attempt I think I'm missing something pretty obvious, but I'm drawing...

Talking to people in class it apparently uses the approximation for exp, I'm so confused.

Okay I got it, cheers for the help mate. I have one last question to do, and would appreciate it if you could perhaps give me a nudge in the right direction with it. It leads on from the last question. Position of a particle acting under a constant force F in the same z direction is...

Ah right, now I'm getting answers that match up now, I didn't think to do it that way, thank you for the advice. Problem is now though the form it is wanted in is extremely similar to what I'm getting, or rather we're getting, except the last term is [1-exp(-kt/m)] Rather than...

Don't know how I missed the whole constant thing, feel a bit of an idiot now. I'm getting (V0 - mg/k)+ mg/k ∫exp(-kt/m) [(V0 - mg/k)+ mg/k] [-m/k exp(-kt/m) + c] Am I heading the right way now?

Yeah okay, so this is what I ended up with as the position z(t) = [( m exp(kt /m)(g m-k U_0)) /k + gmt) ]/k + c Which is quite hard to understand when wrote on here. But is that correct, trying to work out when I'm going wrong as I can't get it in the right form. If that is right...

Awesome, thanks mate. If I were to need to find the position I would need to integrate that, right? Just that I need in a specific form, and I can't seem to get it in that form.

Okay so I ended up with u(t) = [U_0 - (gm/k)] exp(-kt/m) + (gm/k) Is that anywhere near correct?

Homework Statement Particle (Mass = m) falling through a viscous liquid due to gravity. Experiences a drag force that is proportional to its speed. Magnitude of drag force . F = ku = +ve Constant x velocity. At time t = 0, z = position = 0, initial speed = u_0. Homework Equations...