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These questions piss me off: http://www4.boardofstudies.nsw.edu.au/testResults.cfm?testID=15045029&testUUID=A01A58B3-DD06-9617-ADC4C493CABD738B&question_id=2644&question_num=9&correctAnswer=C&user_answer=B&courseID=15330&testQuestionID=300377963 From the HSC's point of view- do slotted tubes...

Ahh shit- thanks bro. Yeah I knew there were the two types of current but I forgot that they travelled in opposite directions

I found these questions hard (effing motors and gens :(). Can you guys explain how to work them out (it'll be good practice for the marathon too)...

Its not in the course lol- its way beyond syllabus. Q/ Explain the effect on the electric current produced by a photocell if the distance from the light is doubled

Does this have something to do with the coriolis effect?

Strong troll. I'll bite though- I don't know what the Copenhagen equation is but I think Schrodingers cat has something to do with quantam mechanics and inherent uncertainty. I think its like a thought experiment where a cat is inside a box and whether an atom decays or not (which we know is...

Maybe... I'm not 100% sure tbh- you might be looking at it too deeply but idk. I'm interested to see what others think of this

It will remain unchanged at the poles because the Earth has no rotational velocity at the poles so a change in rotational velocity will have no effect.

Yes you guys are right- at the equator there is a centripetal acceleration given by a=v^2/r which 'subtracts' from the effective value of g so when you decrease the Earth's rotational velocity, this effect is reduced and hence g increases. I think from memory the value of g is about 0.02ms-2...

Yeah cheers- thanks guys :) Its good when people point out the small details imo

Personally, I've just been reading over other people's notes to get an understanding of the whole course. Then I'll start papers on monday and I'll probs find areas of common weakness -> these then I'll go back and read again etc.

Assume that the Earth rotated slower than it does currently. Predict what would happen to the value of g (gravitational acceleration) at: a) The equator b) The poles

Maybe- it'll all come down to you personally. Like 1st at a school in the 350's could be a high B5 candidate or a state ranker. How do you feel with all the concepts and stuff? If you feel like you get it all and can articulate a nice answer, then defs, 95 is very achievable. Good luck :)

Transistors- small switches that can control or amplify the current etc. Were invented in response to crap communications technology (the thermionic devices)- you can BS about all their advantages etc. Made of semiconductors (n-type and p-type -> BS here). There are two types, PNP and NPN- not...

How hard a 95 is depends frankly on how good you are. 95 isn't a joke of a mark- if you are very solid in your phys and chem, then it is very achievable. If you're a bit shaky, than it is a very hard mark to get- it all depends on you. You can probs tell if you're 95 material by looking at your...

Yeah I didn't know how to do that until there was a question in Terry Lee and that's where I learnt that wherever you have 1's in a trig equation, you can just 'delete' them like that. Its a nice trick

Use double anges to eliminate the 1's. For example, cos(pi/8) becomes 2cos(pi/16)^2 -1 which will 'delete' the 1. Then use double angles on the sin(pi/8)=2sin(pi/16)cos(pi/16). Factorise and then De Moivre's- BOOOOOM. Nice question though

Nah iirc the answer is B. OP do you want a worked solution?

I don't know tbh. I haven't looked at papers yet- has it ever come up before? Jacaranda talks about how transistors work with PNP etc. but their explanation is confusing as eff. I'm currently looking over semiconductors now though- I'll see what these guys have in their notes and let you know

I'll probs do some tutoring and then also work experience at law firms etc