Recent content by StephenP91

Homework Statement There is a train traveling along a circular track. Which rail does the centripetal force act on (Inner or Outer) and what 2 factors determine the stress on each wheel. Homework Equations The Attempt at a Solution So I was thinking it might be the outer, but I...

I read it as no effect. :rolleyes: Ahh well, thank you.

No, I'm not getting it, ultimately the question is asking for some reference to momentum.

Homework Statement A wall is firmly in the ground, if you shoot water at it via a hose why does it not have an effect on the world's rotation? Homework Equations The Attempt at a Solution The question is something like that. You get the general idea.

I'm not in Uni yet. Next year, but I'm wondering: What jobs are available to Mathematicians? I want to do a degree in Mathematics in Uni (If you hadn't already guessed) and I'm just curious as to what career paths would be available to me upon completing my degree. If it turns out that...

Well, in the Photoelectric effect, when electrons get excited to a higher energy level when they attain some sort of energy. In the case of absorbing a photon, does the requisite energy (hf) have to be equal to the energy of one of the energy states. The reason I ask this is because, on the...

I just need an explanation of this. Found it in a question. :smile: Also, photons when absorb by an electron in an atom, does the energy (if less than the ionisation energy) have to be exactly equivalent to one of the energy states and if it isn't what happens? You probably think I suck at...

Turns out. I didn't need it. After I figured out the co-ords of the two stationary points and what happens when X gets inf and -inf then I could see what the roots were and according two the graphics I drew it's about 3.14 so I am pretty sure I didn't have to factorise that damned equation.

http://img215.imageshack.us/img215/1555/question10.png I have done 10)a), but b), I just can't figure it out. I am trying to find at what points y=0, but I just can't do it. I hope someone can help me. Thank you, Stephen.

By factorise I mean, place intro brackets so that I may find the information I am looking for. Namely where the graph crosses the X axis so that I can plot the graph. I was thinking though. Could I just factorise 2x^3 - 6x^2 into 2x^2(x-3) and then get the points I need, then from that subtract...

Well, it's only Pure Core 1 Mathematics. I am trying to factorise: 2x^3 - 6x^2 + 2 = 0 Now, you can't use a calculator. I've tried finding a factor using the remainder theorem, but I just can't find a simple one (|x<5|). I am sure they don't expect us to use a complicated number, like a...

I think I understand now. Because I is inversely proportional to R and because the filament's R is infinitely smaller than the copper's R, the filament gets infinitely more/all of the current. Well that's how I've made sense of it. Whether it's right or not, I don't know.

Well. I have the image of the question. http://img99.imageshack.us/img99/6834/question5.png Question b)ii). I know that the total resistance of the cable is 0 even though the copper itself still has resistance. I just want to know how the combination of the Superconducting filaments...

Much easier if I just write it without the given templates. Well, I am not exactly the good at Physics, so I've decided to ask people that are good at it. I know Ekmax = hf - work function. I am just wondering what could prevent the electron from attaining it's maximum kinetic energy. Oh...