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For question 16 I'm predicting that there's going to be a 6 mark permutation question like 2012 HSC. Also having either a summation like all the cssa papers or a conics question like 2013 question 16. What do you guys think :P

u_{n+1} = u_n +u_n ^2 $ and $ u_1 = 1/3 $ Find $ \sum_{k=1}^{\infty}(\frac{1}{1+u_k})

Do we need to know what the intensity vs frequency graph looks like?

Before starting I would like to say that there are many people who are better than me in 2U maths on this site and I can confidentially say that I'm just an average student. Putting that aside here's the guide: In order to be so called "good" in maths you need a good foundation. Starting from...

I found the taylor series e^x=1+x+\frac{x^2}{2!} +... $ Let $ x= -x^2 e^{-x^2} = 1-x^2 + \frac{x^4}{2!} - \frac{x^6}{3!}+... $ Integrate both sides $ \int{e^{-x^2}}dx = \sum_{k=0}^{\infty}{\frac{x^{2k+1}(-1)^k}{k!(2k+1)}} +C Did i integrate it or not ?

Can someone tell me what it is and how you use it? Its in ellipses.

Does anyone have any physics/ chemistry papers from this year?

Does this sound right ? When light hits an n type semi-conductor, if the frequency is higher than the work function electrons will be emitted towards the p-type semi-conductor from the n-type. Light must hit the n-type semiconductor as the electrons are in the n-type thus it requires...

Split ring = DC motors/generators Slip ring = AC motors/ generators Split ring reverses current direction every 180 degrees slip ring ?

Is it possible to do Actuarial studies without directly or indirectly working with interest ? Is engineering really worth it?... I don't want to finish a four year course without a job.

Does anyone know the links for raw marks to scaled marks for : Maths x1 maths x2 Physics Chemisty English (even though ive seen it)

A black hole occurs when a star dies and its escape velocity is greater than the speed of light. Considering Einstein's theory of special and general relativity if i travel at 0.9999c towards the center of the black hole (The speed is only the rockets thrust) would Einstein's theory break and...

Okay so BCS theory explains how superconductors maintain 0 resistance below critical temperature... Can someone explain how it explains it? I dont get it...

1) Which one has a higher conductivity? Wouldn't it be n-type due to the extra electron ?

How do you prove \frac{1}{7 \cdot 2^2 \cdot 3^5} = 2(\frac{1}{7 \cdot 3^7} + \frac{1}{9 \cdot 3^9} + \frac{1}{11 \cdot 3^{11}} +... )

If i rock up with a beard(aka slight stubble in my school lol) we cant sit the test on that day and we get 0... First does this rule apply for all schools and are they allowed to do that for hsc ?

A radio station emits radio waves at a frequence of 104.1 MHz. What is the energy, in joules, of each proton being transmitted by the radio station?

For extension 1 and 2 maths along with physics whats the mark you need to get to state rank and whats the 1st mark ?

Can someone explain the jokes and innuendo's made about MIF i kind of get it but not the ful story ahaha can someone explain?

Since there's an individual thread for integration there should be one for something far more challenging. Rules: 1) Answer questions before adding more 2) Questions must have the answer(Since permutations are trivial) but write them in white as a way of checking!! 3) Non-2015ers must wait and...