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Re: HSC 2015 4U Marathon Here's my solution for part (i) and an idea for part (ii) - it's probably not written in the most mathematically concise way but it's something: https://imgur.com/kldJ69o

Hi everyone, I realise this is probably a simple concept which I just don't seem to be able to grasp very well. This was the question which got me thinking about it: https://imgur.com/tqbIeIi Basically, I'm confused about how I should understand calculating the volume in part (ii) in...

Sometimes I do it timed for 3 hours, sometimes I just do it like an exercise. It is true that doing the former increases your exam technique, however as you said, it does become very exhausting after a while. Personally I would suggest doing a mix of both and do whichever one you feel like doing...

Re: MX2 2015 Integration Marathon How was I meant to do it?

Re: MX2 2015 Integration Marathon I got \frac{2}{sin\alpha }[tan^{-1}\frac{1+cos\alpha }{sin\alpha } - \frac{\pi}{2} + \alpha ] Idk if it can be simplified though

Re: MX2 2015 Integration Marathon Yep - that's the way that I first did it to get an answer of \frac{\pi}{2\sqrt{30}} But then I started fiddling around with partial fractions and t method and solved it a different way - but I must have made a mistake somewhere because it yielded the wrong...

Re: MX2 2015 Integration Marathon Next Q: \int_{0}^{\frac{\pi }{2}}\frac{dx}{6-sin^{2}x}

re: HSC Chemistry Marathon Archive Next Q - 2007 HSC Q19 There are many benefits and problems associated with the use of radioisotopes in industry and medicine. Evaluate the impact on society of the use of radioisotopes in both industry and medicine. In your answer, give specific examples of...

Re: HSC 2015 4U Marathon And then how do you evaluate that integral? t method seems a little tedious, is there a simpler way?

Re: HSC 2015 4U Marathon How did you do this?

Re: HSC 2015 4U Marathon https://imgur.com/wTEEPbf Don't know how to do part (iii)

Do it, if you think you might like it. I thought it would be insanely hard, but it's not as hard as it may seem. If you don't like it you can always drop it

I just tried copying out one of my creatives with a new artline felt-tip pen - 900 words in 32 minutes, booyah :headbang: Seriously tho, using a felt tip is about 2836449% less straining on your hand than a kilometrico

Hmm... I reckon part of it may be down to the fact that up until about a week ago I've been using kilometrico pens - but this week I've been using artline pens which are much easier to write with. I might time myself tomorrow and see how many I can write using an artline

Just curious, how many words can you guys usually write in exam conditions in 40 mins? When it's a question I haven't seen before, it's usually around 800-900 for me and idk if that's enough lol

re: HSC Chemistry Marathon Archive Next Q: Explain the optimal conditions for the production of ammonia in the Haber process and hence evaluate the importance of monitoring the reaction vessel for the Haber process (6 marks)

re: HSC Chemistry Marathon Archive Another good one to distinguish between Pb2+ and Ca2+ is to add hydroxide - if a (white) ppt forms, Pb2+ is present, if not, Ca2+ is present

re: HSC Chemistry Marathon Archive Next question: (a) A solution containing an unknown cation is tested in a variety of ways. The results were as follows: No ppt with dilute hydrochloric acid No ppt with ammonia solution Demonstrates a greenish flame test. (i) Identify the unknown cation. (ii)...

Thx haha, I'm gonna need all the luck I can get :lol:

Yeah you're exactly right, and plus it wasn't a very good plotline anyway, hence why I'm changing it