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Re: HSC 2013 3U Marathon Thread double post

Q8 b) ii) because the two lines aren't perpendicular to each other. 5) b) you can graph it, you can memorise the identity sin (pi - x) = sin (x)

re: HSC Physics Marathon Archive 2) 5.2x10^(11) m away from Jupiter ? o.o I doubt I'm right..

Imagine going to an examine that you studied for 7 days. Only to forget all the names of the characters and quotes as soon you sit down on that paper.

Probably around: distinctively visual: 17-18/20 Close study of text (Cosi): 8/20 Into the World: 11/20 I was ranked 4th T.T and my teachers and tutor were expecting me to get a band 5. I guess not anymore...

re: HSC Physics Marathon Archive 2=\frac{1}{2}(1.11)^2\ t 4=(1.11)^{2}\ t Careful of silly mistakes. :L

re: HSC Physics Marathon Archive The values are quite similar. Can I see your working out?

re: HSC Physics Marathon Archive Correct~ $In relation to the operation of AC induction motors, give an detailed explanation on why three-phase transmissions are used. (6 marks)

re: HSC Physics Marathon Archive $On planet Rice, a man drops an $ 0.1kg$ pen. Two metres above the surface of Rice. He noted that the pen took $1.11\ seconds$ to hit the ground. If the distance from the surface to the centre is 2563 kilometres. Find the mass of the planet.

Re: HSC 2013 3U Marathon Thread I'm going with seanieg89 answer. $Using first principles prove that $ \frac{d}{dx}(x^{n})=nx^{n-1}

Re: HSC 2013 3U Marathon Thread Here is a fun question to burn off.. In this video here five men has 5 different colours of clothing to choose from, what is the probability that all the men come out wearing a different colour.

You're correct keep going

What do you mean?

Re: HSC 2013 3U Marathon Thread $i)\ \ \ Given that $a=y+d $ use the binomial expansion of $(y+d)^{n},$ where $n$ is positive integer, to show that $a^{n}-y^{n-1}(y+nd)$ is divisible by $d^{2} $ii)\ \ \ Hence show that if $a$ is the first term, $d$ the common difference, $L$ the $n$-th term of...

Re: HSC 2013 2U Marathon Ahh... that makes alot more sense, I was wondering how to show the solution in an more formal sense. I'm sorry Sy I will never doubt you again.

Re: HSC 2013 2U Marathon $A ladder is resting again an wall makes an $ 60^{\deg}\ $angle with the ground.$ $ When the base off the ladder slides 1 metre further from the wall it makes an $45^{\deg}\ $ angle with the ground. $$ Find the length of the ladder.

Re: HSC 2013 2U Marathon I don't think 2 unit learn angle sums...

Re: HSC 2013 2U Marathon P(Even\ for\ 1 \ throw)=\frac{1}{2}\\P(Even\ for\ 2 \ throws)=1-(\frac{1}{2})^{2}\\P(Even\ for\ 3 \ throws)=1-(\frac{1}{2})^{3}\\\therefore P(Even\ for\ n \ throws)=1-(\frac{1}{2})^{n}

Trust me when I say this don't buy Maths in Focus, grab the pdf off your teacher or someone else. The examples and questions that MiF gives you will only be useful if you are planning to get a band E2, and it's content isn't that great either. If you want a textbook that 'explain the concepts...

Re: HSC 2013 2U Marathon $Consider the circle$ \ x^{2}+y^{2} -2x-14y+25=0 $ Show that if the line $y=mx$ intersects the circle in two distinct points, then: (1+7m)^{2}-25(1+m^2)>0