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Really? The only topic i actually enjoyed in preliminary physics was the cosmic engine. HSC Space module is pretty interesting, furthering your work on moving about and integrating it with space, and you learn about Einstein's theory of special relativity. Motors and generators is much more...

Math/Chem/Phys (haha all my subjects except english)

\sqrt{11 - 6\sqrt{2}} \equiv a + b\sqrt{2} $Squaring both sides$ 11 - 6\sqrt{2} \equiv (a + b\sqrt{2})^2 $Go from here$

Posted my response before i saw yours Spiral, didn't mean for you to delete your response. Was anticipating an awesome explanation.

EMF = Electromotive force. It is synonymous with potential difference and voltage, the things that cause charged particles to move. Back EMF is only the same as induced EMF when it opposes the supplied EMF. In a motor, when the power source is switched on and the armature is constantly...

Re: 2012 HSC MX2 Marathon Yes please!

Haha this is my fastest latex yet as well. :P

You mean solve for x? 2sin^2x + cosx = 2 $Recall Pythagorean identity: $ sin^2x + cos^2x = 1 sin^2x = 1 - cos^2x $Using this,$ 2(1 - cos^2x) + cosx = 2 2 - 2cos^2x + cosx = 2 2cos^2x - cosx = 0 cos(2cosx - 1) = 0 $I'm going to assume the domain of solutions is restricted between 0 and...

It is more reactive than copper, meaning it has a greater tendency to donate electrons than copper. Copper, being less reactive, has a greater tendency to accept electrons. So if you dip copper in to a Cu2+ solution, zinc will oxidise donating electrons to the copper ions forming Zn2+ and...

I remember vaguely that it is used to sample areas that are potentially rich with desired minerals/metals. Have a look in your textbook.

how do i get as many friends as you

Chemistry notes are incredible! Each dot point is thoroughly covered - some containing model answers to past HSC questions which you can model your answers after. Highly recommended for anyone looking for excellent chemistry notes.

Go through your errors on the test. Your mistakes are lessons to never make them again.

I've forgotten where.. Spent some time in year 11 gathering all the resources i could get my hands on haha. No problem, i'm glad i helped! Best of luck with the rest of your HSC. :)

At least finish off rationalising.. Don't just leave it there.. (1 + \sqrt{2})^2 - \frac{(1 - \sqrt{2})^2}{(1 + \sqrt{2})^2(1 - \sqrt{2})^2} = 3 + 2\sqrt{2} - \frac{3 - 2\sqrt{2}}{(-1)^2} = 3 + 2\sqrt{2} - \frac{3 - 2\sqrt{2}}{1} = 4\sqrt{2}

Rationalise right term first by multiplying numerator and denominator by (1 - \sqrt{2})^2 Expand left term. Combine both terms together for answer.

Liquid. Temperatures < -119 degrees celcius would be solid. Substance will start melting at -119 degrees celcius. Temperatures > -119 degrees celcius would be liquid (assumed all temperatures higher will be liquid as no boiling point given) So temperature = 1 degrees celcius would be liquid.

HSC past paper questions: http://www.boardofstudies.nsw.edu.au English trial past papers in the resources section of this site.

You could practise writing essays to various types of questions so you'll be prepared for any question they throw at you tomorrow.

No problem! I think those are the main calculations although i may have forgotten something. If you need any further clarifications with any of those concepts, feel free to PM me.