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85 is definitely possible. Just study very hard for your HSC exams :)

Hopefully we get a question on proving pi or e being irrational :) those questions tend to be a lot of fun

More like probability = gg :'(

Post your predictions for what you may think will come up in this years MX2 exam, in particular, question 16 :) Also discuss any thoughts relating to the upcoming exam. I predict that there will be a nasty conics question in question 16.

I was referring to your first image. Also, that the magnetic field lines drawn should be into the page rather than out of the page. Using the crosssection.jpg image, if you move a plane around the Earth, you will see that there is a change in magnetic flux, and hence, the answer must involve...

Yes, from what you have drawn, if you move the solid metal sheet (representing the planes in the question) through the magnetic field, there is a change in magnetic flux. If you just move the sheet up and down the page, you can see that there is no change in magnetic flux.

When you're moving north to south or south to north, you will be travelling on the same set of flux lines which means that there will be a minimal change in magnetic flux. However, if you move west to east or east to west, you pass through a lot of flux lines which means that there is a great...

Marks are given for the derivation, so it would be best to derive the ratio everytime

Consider: m.a^m = a^m + a^m + ... + a^m (m terms) m.a^m > a^0 + a^1 + ... + a^(m-1) (since a>0 and m is a positive integer) m.a^m + [m.a^(m-1) + ... + m] > a^0 + a^1 + ... + a^(m-1) + [m.a^(m-1) + ... + m] m.a^m + m.a^(m-1) + ... + m > 1 + a^1 + ... + a^(m-1) + m[a^(m-1) + ... + 1] m.a^m +...

It wasn't as bad as I expected, but I really don't know how I went

The given identity has no restrictions on a,b,c,d except that they all must be real. Letting c=1 and d=1 should be correct

If you have roots x=a, x=b, x=c and you want 1/sqrt(a), 1/sqrt(b) and 1/sqrt(c), subbing x=a, x=b and x=c into y=1/sqrt(x) will yield your desired roots :)

To estimate, we will need your rankings :)

I used to attend Sigma Science, but had to leave due to commute issues, what I can say about the tutoring centre is that it helped me a lot. In prelim, I was ranked ~12th in physics, but after joining sigma science, I ended up getting rank 3 in the first HSC assessment task. This was because...

15: All reactions are 1:1 with CO2 so by n=m/M, the smaller M is, the greater the moles of CO2 and hence the greater the volume. Calculating the molecular weights of the reactants, we see that option D (NaHCO3) has the least molecular weight (84.01 grams/mole). Therefore, D. 17: From the...

Morning of the exam, got mid 90s. Cramming only works if you already have a good understanding of your subject.

Defs 99.50+

Everyone shares textbooks regardless :)

How did you get bonus points from macquarie? I thought that you couldn't get them if you were doing actuarial studies?

Very happy :D English on 1st week monday and tuesday 4U on 2nd week monday Physics on 3rd week monday Chemistry on 3rd week wednesday 3U on 3rd week friday