Search results

I went for: 1. A 2. D 3. B 4. D (dunno, kind of looked like what would happen :p) 5. C (sin@ = sin(180-@) and range is based on sin2@ so range doesn't change. Increasing the angle means that there is a larger vertical component of the velocity increasing time of flight) 6. B (random...

Ahh, that makes more sense then. I reckon you'd be safer in drawing the graph of either force separately because the net force logic only works between two protons (so you'd end up having to draw another diagram to make it relevant to neutrons :-S).

I don't think the nuclear force becomes repulsive again at larger distances - I'm pretty sure it's just very localised (partly explained by the pion transfer theories) and so it just kind of fades off. If it became repulsive like that then neutrons wouldn't be useful probes or for fission...

The main ones would be: - analyse the signficance of the hydrogen spectrum in the development of Bohr's model of the atom and - describe how Bohr's postulates led to the development of a mathematical model to account for the existence of the hydrogen spectrum: Rydberg eq'n

Thanks dude. Physics is my last exam too so I can understand the feeling of having one last hurdle. It'll be awesome once we're over it :D. Anyhow, best of luck to everyone in the exam! You're all intelligent people so I'm sure you'll do fine.

If you wanted to go slightly over the top with the explanation you can say that a weak force interaction resulted in a down quark becoming an up quark (turning a neutron into a proton). In order to conserve charge an electron is released from the nucleus along with an anti-neutrino (in order to...

Yeah, that makes sense.

Well the moderator nuclei are small ones which slow the neutrons down and don't absorb them. Theoretically, I suppose you could find a material compound which contained a fissionable isotope and an element which could provide moderator nuclei, however, I've never heard of such a combination...

The control rods absorb the nuetrons which keeps the reaction rate relatively constant (rather than letting it grow exponentially). They create a situation where roughly one neutron per fission goes on to split another atom. Moderators slow down the neutrons. Fast neutrons are more inclined...

Hot damn, you champion. Thank you very much!

Well, quoting from the jacaranda text: It's the idea that underpins all that basic Galilean style relativity we did in 'moving about' in the prelim course. If you remember it you had questions like 'Aircraft A is travelling north at v ms-1 and aircraft B is travelling east at u ms-1 - what...

The significance is that all that time dilation, length contraction, relativity stuff follows from that assumption. If you assume that the speed of light is constant relative to an observer then other quantities have to become variable. The derivation of time dilation which I quite like, for...

Yes, the Usyd combined BSc, MBBS / BScMed, MBBS, To scrape the crème off the top of the HSC latte so as to stop loosing so many of the top students in NSW to the UNSW undergraduate med program.

Awesome, that's exactly how my graph looked. Provided yours is right I'll be sitting pretty.

The dodginess seems to be here: in your use of the log "law". I couldn't track down any formal refutation but I had a search of the dr math site and I came across this. Probably not enough to sate your desire for answers though.

I spent about 4-5 of those 7 marks talking about proteins (amino acids, peptide bonds, primary/secondary/tertiary/quaternary structure). Hopefully I didn't neglect eletrophoresis.

I think you should take 15 units. You'll be more likely to get a UAI of 100.

'Cause at higher altitudes you get less oxygen than you would at lower altitudes when you breath in. Initially I believe this leads to less oxygen being transported to your muscles so you 'run out of fuel' faster, so to speak. Eventually your cardiovascular system adapts though (might take a few...

When you see (pi)- it's like e-. When you see a single minus like that it indicates that the particle has a charge of minus one (not simply that it has a negative charge). It'd be the same deal if you saw K- which represents a Kaon particle with a charge of minus one. Given that charge then all...

Time of flight is 2.5s so when t=2.5 , y=0. s = ut + 1/2.a.t2 (s = y = 0) (4.9)x(2.5)2 = (2.5)x(u) therefore initial velocity u = 12.25 ms-1. We also know that the time to reach max height is 1/2 the time of flight (1.25s) so we can calculate: Max height = (12.25)x(1.25) - (4.9)x(1.25)2...