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do i know you?

Okay.. but i suggest you read over that section in a textbook.

Sorry i don't, but go through a textbook and past HSC/trial papers for questions on it.

That was to do with the debate whether cathode rays (streams of electrons produced in discharge tubes) were waves/particles.

*cough cathode rays :P

It's not a particle and a wave. It behaves as a particle or a wave. There are no experiments where light exhibits both particle and wave properties simultaneously. Light must be considered as a particle to explain certain phenomena such as black body radiation and the photoelectric effect. We...

What exactly are you finding difficult to understand about quantum theory? Reflecting is to throw back without absorbing (how light bounces off a mirror) where as emitting is to produce and discharge. The phenomena you observed involving magnets, superconductors and liquid nitrogen is due to...

Numerator becomes x(x^2 - 1) + x^2 - 1 Split the fraction in to two, factorise denominator as difference of two squares and simplify. One function is odd so that becomes 0, other one becomes tan^{-1}x As x -> infinity, tan^{-1}x \rightarrow \frac{\pi}{2} As x-> -infinity, tan^{-1}x...

Re: 2012 Year 9 &10 Mathematics Marathon i think you only have one 5L jug and one 3L jug. are you taking it to be 3 jugs? @enoilgam, i've been playing a game exactly like this on my phone and it's so much fun haha :)

english - so far 67/90 (didn't get handed back creative) very happy with this as i am terrible at english and i got 14/15 for comprehension :D maths 3u - 64/70 (was annoyed after this, i accidently skipped a 2 mark question... but great mark nevertheless) maths 4u - 88% chemistry - 96/100 (maybe...

very pleased with my trial marks :') did much better than i expected

0 \leq arg(z - i) \leq \frac{\pi}{6}

good joke m8 i don't have years worth of experience in fps games for nothing if we ever play laser tag, you're going down

ahh okay thanks, i'll update

I had a typo before which may have confused you and i've corrected it. It is 30 + 20ln(2/5)

Sorry, i meant it to mean metres

Haha just helping around as everyone else is at the BoS meat :P It is, that's why i subtracted it when considering the forces, using \Sigma F = ma

By Newton's 2nd law of motion, ma = -(\frac{1}{10}mg + \frac{mv}{20}) = -\frac{m}{20}(20 + v) a = -\frac{1}{20}(20 + v) v\frac{dv}{dx} = -\frac{1}{20}(20 + v) \int ^0 _{30} \frac{v}{20 + v}dv = \int ^d _0 -\frac{1}{20}dx \frac{1}{20}d = \int ^{30} _0 1 - \frac{20}{20 + v}dv d = 20[v -...

a) Resolving the forces of the mass: Vertically: T_1 cos\theta - T_2 cos\theta = mg = 20 ... (1) Horizontally: T_1 sin\theta + T_2 sin\theta = \frac{mv^2}{r} = 72 ... (2) For T_1, (1) \times sin\theta + (2) \times cos\theta , 2T_1 sin\theta cos\theta = 20sin\theta + 72cos\theta You can...

Consider the expansions of (1 + x)^{10} and (1 - x)^{10} Add them two together, divide both sides by 2, let x = 3 and you should get the result.