# Recent content by psychotropic

1. ### HSC Marks all nighter thread

when are the other merit lists published?
2. ### Extension 2 questions for 2014?

1. You can either write one long story, or a suite of short stories (no more than 4/5). If you are writing a suite, you must make sure that the stories are thematically linked, and when looked at together, are greater than the sum of the parts 2. Being able to write and do well in Extension 2...
3. ### Multiple Choice

a polystyrene cup?
4. ### Multiple Choice

13 has to be D. If we accept the premise that the writing on the cup means nothing and is simply a trick, then the cup could be made from either PE or polystyrene (polystyrene cups are very popular). It would hence seem that this would mean A and B are correct, which cannot be the case. However...
5. ### HSC 2012-2015 Chemistry Marathon (archive)

re: HSC Chemistry Marathon Archive An indicator is a substance that, in solution, changes colour depending on the substance that is added to it. This colour can be used to approximate the pH of the solution, as indicators are known to have certain colours at different pH levels pH...
6. ### Boundaries on Idea/Topic for Critical

I also did a critical essay this year. My advice would be to start off fairly broad, perhaps with an investigation of a genre, or literary paradigm, a particular author, or texts across time that you think share some interesting parallels. However, after your initial 6-7 weeks of research...
7. ### Section I - Multiple Choice

Case I is incorrect as you have to consider which person is excluded. this means that you have to multiple case 1 by 6, yielding 4020
8. ### Section I - Multiple Choice

the answer to 10 is b
9. ### HSC Physics Marathon 2013-2015 Archive

re: HSC Physics Marathon Archive using V = 4pir^3/3 We find r = 62.035m then we use g = GM/r^2 and we get g = 1.7332 x 10^-11 Then we use v^2 = u^2 + 2 ar, with v = o and r = 1125m. This yields u = 1.97 x 10^-4 m/s Using the symmetry of the parabola, the velocity which it hits his head with is...
10. ### HSC Physics Marathon 2013-2015 Archive

re: HSC Physics Marathon Archive the speed is 1.97 x 10^-4 m/s
11. ### aah devs. thanks for your help!

aah devs. thanks for your help!
12. ### devestating- have you sent them to anyone, such that they might be on your email? Thanks got...

devestating- have you sent them to anyone, such that they might be on your email? Thanks got your troube
13. ### HSC Physics Marathon 2013-2015 Archive

re: HSC Physics Marathon Archive I believe the RHS should be on v because t = d/v
14. ### HSC Physics Marathon 2013-2015 Archive

re: HSC Physics Marathon Archive changed? i think i typed something in the calculator incorrectly. As to your qn: t = d/v 3.28 = 4.37c(1-v^2/c^2)^0.5/v squaring both sides and rearranging: v^2 (4.37^2 + 3.28^2) = (4.37c)^2 which gives the answer. I forgot to square the 3.28 when i squared...
15. ### HSC Physics Marathon 2013-2015 Archive

re: HSC Physics Marathon Archive Due to the effect of length contraction, the journey will appear less than 4.367 light years for those within the spacecraft, which means that they may be able to journey in 3.28 years. Quantitatively, d = 4.367*c(1-v^2/v^2)^0.5 t = d/v Using these equations...