Year 12 2013 Chit Chat Thread (1 Viewer)

[Sy123]

Do you know the easy way to integrate:

I know how to integrate:

easily if that's what you mean :s

You just notice that it is in the form f'(x) cos f(x) so you can integrate it to make sin f(x)

But yeah I can't think of an easy way to do your one

 

[RealiseNothing]

I know how to integrate:

easily if that's what you mean :s

You just notice that it is in the form f'(x) cos f(x) so you can integrate it to make sin f(x)

But yeah I can't think of an easy way to do your one

Hope this isn't too small.

 

[twinklegal19]

I try to keep reading time to planning out the last question though :/
Because in my exam, the questions will be difficult and I won't be able to flick through it like I did with Baulkam Hills

Ah fair enough

only thing I could think of that works

 

[Sy123]

Hope this isn't too small.

Ahhhh wow that is really efficient. Thanks for the tip!

 

[RealiseNothing]

Ahhhh wow that is really efficient. Thanks for the tip!

It only works for reducable functions, ie when you differentiate it enough it will go to 0.

 

[twinklegal19]

It only works for reducable functions, ie when you differentiate it enough it will go to 0.

basically just polynomials?

 

[SpiralFlex]

Tabularr integrasian.

 

[Lieutenant_21]

What should I do to become blitz speed at MX2?
For easy-er type questions I can solve them at an average speed (I think), and from what I've seen and heard, the main problem in MX2 is time management.

So I want to know what I can do to maximise my solving speed in the easy stuff like Complex Numbers, easy Polynomials and Graphs (and easy Conics)
I don't want people to say practise because its boring to just do the same easy questions over and over

How long does it take you to do the first 3 questions in MX2 (Old format)?
I find the best way to do tedious conics questions fast is by thinking of a method for solving the question first then start the algibra work because sometimes if you just start doing the algebra then realise something is wrong or it is the wrong method a lot of time is be wasted.

 

[Lieutenant_21]

Hope this isn't too small.

wow, nice method!

 

[Sy123]

How long does it take you to do the first 3 questions in MX2 (Old format)?
I find the best way to do tedious conics questions fast is by thinking of a method for solving the question first then start the algibra work because sometimes if you just start doing the algebra then realise something is wrong or it is the wrong method a lot of time is be wasted.

Hmmm I'm not sure about that I haven't really timed myself on it.

And yeah I do something similar for conics, where I will think of how to approach the question before doing the question.

 

[Lieutenant_21]

Hmmm I'm not sure about that I haven't really timed myself on it.

And yeah I do something similar for conics, where I will think of how to approach the question before doing the question.

Do you think they are doable in around 20 mins?
Most people who state rank in mx2 have at least 1 hour for the last 2 questions. So far I get only around 7 questions done in 3 hours lol

 

[Sy123]

Do you think they are doable in around 20 mins?
Most people who state rank in mx2 have at least 1 hour for the last 2 questions. So far I get only around 7 questions done in 3 hours lol

Wow 20 minutes.....
Yeah I reckon its doable but you would probably have to be damn fast for that

 

[asianese]

Not always I dont think. From what I know, once you get to a certain point in 3 unit, it becomes more a game of luck as one stupid mistake can pretty much rule you out of SR contention (maybe some people with more knowledge on HSC maths and stuff could confirm this).

This is certainly the case.

For a very good - top 4U student, 3U comes down to the luck of the draw of the last question and stupid mistakes. Esp with school assessments, it is a dogfight between the top 4U students to minimise (or eliminate .. ) silly mistakes to gain top 3U position.

 

[Sy123]

In the Physics course, for projectile motion, and possibly other topics, I prefer to use the formulas for the 3U course.

i.e





I can easily derive these, and gives me the power of calculus, they are similar to the ones given on the formula sheet, however they lack for instance, the angle of projection, the initial position of the projectile and so on.
For practise I have been using 3U methods the whole time.

Will I lose marks for doing this?

 

[brent012]

I think general conensus is use 3 unit to check if you want and that more often than not it's easier to just use the formulas given in the sheet.

 

[enoilgam]

I think general conensus is use 3 unit to check if you want and that more often than not it's easier to just use the formulas given in the sheet.

I never did physics, but from what I remember from other courses, stick to the syllabus or what they want you to use. Going off the syllabus in the HSC is not encouraged (which I find stupid, but that's another story).

 

[Sy123]

I think general conensus is use 3 unit to check if you want and that more often than not it's easier to just use the formulas given in the sheet.

I'm much more comfortable with the 3U way, and what I do is, I make everything a pronumeral until I find an expression for the final answer

i.e.



And then I plug in the values from there because I only need to use a calculator once, hence saving time.
I find the formulae clunky and not very efficient.

Will I lose marks though?

 

[Sy123]

I never did physics, but from what I remember from other courses, stick to the syllabus or what they want you to use. Going off the syllabus in the HSC is not encouraged (which I find stupid, but that's another story).

:/

What if I convert the formula into my own version.

i.e.



Where g is a positive constant, and direction of force is downwards hence negative

Let V be the velocity of projection, by right angled trigonometry,







Since delta y is change in y

If I do the same for v_y but express as

Am I allowed to do this?

 

[enoilgam]

Am I allowed to do this?

I would ask your teacher or a HSC marker - I'm not too sure. Although, if I had to guess, I would say that they would tell you to stick to what you are given.

 

[brent012]

Will I lose marks though?

Possibly, especially if you hypothetically make mistakes and/or if marks are awarded for working. I can't remember how marking works for Physics but even if they don't mind you using 3u formulas if you make a mistake you won't be getting partial marks for working. Like Enoil said you should really just stick to the syllabus. They aren't hard formulas and are provided in the exam anyway.