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Ohm's Law tells us about the current conductivity of a substance or RESISTIVITY (p). The resistivity of a substance is given by the amount of electric field that is needed to make a certain current per area flow through a conductor. Each material has a specific resistivity that you can look up...

OK, attached is a prac report I did to show as an example to a Physics class I was teaching. It is not the best in the world because I whipped it up in half an hour. However, it will give you a basic idea. Prac reports also need a risk analysis (as stated in the post before). In Hypothesis you...

Actually the tense used in prac write ups is impersonal, ie there is no we, I or such. eg The apparatus was set up as follows. The ball was observed to fall to the ground with increasing acceleration. When measured it was found to equal 9.45 ms-1. And so on. Does that help?

Actually that's not entirely true. von Braun is a mega name in getting the Americans to the Moon! The recent TV series on ABC about the Race to Space was fantastic and outlined a lot of that. It also mentioned his Russian counterpart (whose name escapes me now) but between them they made it...

Oh and there is never such a thing as a stupid stupid stupid question. If there is something you don't understand you can never get an answer without asking :D Ask away. :uhhuh:

But always remember in the report to account for errors. There could have been errors due to the fact that the string is not massless and would have contributed in some way on both ends. What about air resistance. There could be lots of factors. Just be creative. :D

Can I just say now, there is no right or wrong way of doing these questions. You acn use the Physics equations OR you can use Ext 1 Maths to do it. I always preferred the Ext 1 maths way because you can derive equations that take into account initial conditions and whether you start on top of a...

Certainly Pauli's discovery of the neutrino is significant because it showed there were other particles inside the atom. Scientists then went looking for more. Heisenberg had a bigger contribution to the model of the atom. He also rejected the mechanical model and went in search of a...

The first thing to understand is that every point on a wave front acts like a pebble in a pond. When you drop a pebble in a pond it makes a circular ripple that moves outwards. When you get lots of them all in a row you see a long straight wave front. OK? Diffraction - diffraction occurs when...

The understanding of matter, meaning the structure of the atom, I am assuming since it is Quanta to Quarks ;) OK, firstly the discovery of the electron and the way it works in cathode ray tubes allowed physicists to develop the Cathode Ray Oscilloscope which significantly altered a physicists...

Pauli proposed the Pauli exclusion principle which stated that no two electrons in an atoms can have exactly the same set of quantum numbers. The quantum numbers n, l, m[sub]l[sub], and m[sub]s[sub], describe the energy of the electron (and dictate the orbital level), angular momentum of the...

No real need to use the 3 Unit maths approach. You would only use 3 unit integration if they were going to ask you to do things like: - find the distance the electron travelled, - find the time it took for the electron to leave the electric field and so on. a) The energy gained from the...

It certainly should.

Further to the ball toss in the car. If the car is travelling at a constant velocity or stationary (which is, to all intents and purposes also a constant velocity) then you cannot perform an experiment to determine if the frame of reference is moving or not. If you toss the ball up it will...

I wouldn't say whiners, I would just say discussing the issues that are pertinent. From the perspective of someone who did the HSC some years back (under the older system) and is now teaching the newer system, I think there are pluses and minuses. My year through was one of the first to have...

Or recognise the 60o, 30o, right angle triangle with sides 1 unit, 2 units and root 3 units long. Then sin30o = 1/2 So sin230o=1/4 :D Hope that helps

I don't believe there is any one good book for HSC Physics because each has strengths and weaknesses. I have found (from a teaching and tutoring perspective) that: Physics 2 - Andriessen, Pentland etc (make sure you get the one for the revised syllabus, the other one misses things and has extra...

Well, you need to know how to describe the three sorts of accelerators: - Linear Accelerator - Cyclotron and - Synchrotron Know how each works and how they accelerate charged particles. Then know why they accelerate charged particles: to smash them into other particles to break them apart and...

I would like to add my best wishes. Think well, write well, do your best and don't panic! (The Hitchhiker's Guide was right when it said that.) :read: All the best for the HSC and remember, the pain is almost over. One last push. And then it is time to partay... GOOD LUCK! :graduate:

And the question is? Not all of us have the questions. AND, another neat trick. If you have done projectile motion in Extensions 1 or 2 maths. USE THAT to do Physics questions. You derive your own equations (less to remember) and are more likely to get the right answer if you set up the initial...