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Q1 x = n sin ((2.pi/w).t) period (w) = 6 secs magnitude (n) = 8 cm x = 8 sin ((2.pi/6).t) v = dx/dt = (16.pi/6) cos ((2.pi/6).t) a = dv/dt = -(32.pi2/36) sin ((2.pi/6).t) when x = 5cm; t = (6/2.pi) sin-1(5/8) v = (16.pi/6) cos sin-1(5/8) = 6.5cm/sec (also -6.5) a = -(32.pi2/36) *...

Haha, do a science degree at uni and no prescribed text will be less than $100.-. And then they want you to read a coule of others. Not cheap.

True that!

I don't see a t substitution! :) let I = ∫ cot(a/2) da ? let t=tan(a/2) dt/da = 0.5sec2(a/2)=(t2+1)/2 da = 2dt / (t2+1) therefore I = 2 ∫ dt/t(t2+1) let n=t2+1 dt=dn/(2(n-1)0.5) therefore I = ∫ dn/n(n-1) = - ∫ dn/(0.25-(n-0.5)2) =...

use t substitution; let t = tan(x/2) dx = 2dt / (1+t2) sinx = 2t/1+t2 cosx = 1-t2/1+t2 ∫ dx/(cosx +sinx) = 2 ∫ dt/(-(t2-2t+1) +2) =2 ∫ dt/(2-(t-1)2) =ln(|21/2+(t-1)/21/2-(t-1)|)/21/2 + C =ln(|(21/2-1+tan(x/2))/(21/2+1- tan(x/2))|)/21/2 + C , x /= 3pi/4

This thread should be about people in genuinely poverish circumstances. It isn't fun to have to spend nearly all your money on food and have very little for luxury, but it is devastating when all your money can't even buy all your food. Maybe people should take a step back and see how...

It is like all things in life, a thing of moderation. We are all aware of the problems of overexposure to the sun. No seems to care about underexposure. UV light (wavelengths 290-315nm, the energetic ones) are required for the photosythesis of vitamin D. Alternative sources exist as...

Pure class. It was a safe place to post this without causing too much commotion.

"It must be splendid to command millions of people in great national ventures, to lead a hundred thousand to victory in battle. But it seems to me greater still to discover fundamental truths in a very modest room with very modest meanstruths that will still be foundations of human...

I think you have completely inverted reality. A hypocrite's what?

he has a neurotic complex where he makes it hard for us. (thanks for the rep though!) fanz ---> thanks

On one hand we have Corby who may die if found guilty and there is an outcry and people are sending death threats. On the otherhand we propose that we allow torture to death from anyone who is suspected to be hiding information. We will see how long each issue is a talking point. One...

Window sill ??!! LOL. Once you get your hand on a dessicator you'll see where I am coming from. They aren't too good for bumping up your yield though!

It's amazing how little you spend if you never spend anything at campus. I get my fair share of benefits from compulsory student unionism, like sports insurance and physio. Unigym is still hella expensive and so not within my means. For sporting clubs its going to be really hard to get...

I liked that movie, but I guess I'll skip on the book then.

Ahh molecular modelling .. brings back memories. 1st year chem allows the use of molecular modelling equipment, which everyone took as an excuse to smuggle sugar snacks into the exam!

Uhh, is that supposed to be a compliment!?!

Last game ==> New Market Last computer game ---> KOTOR: The Sith Lords (Obsidian murdered it .. wtf was with that game)

I remember my workplacements ... so ... ... boring. Local newspaper where I could have told the advertiser more about PS than he could me. I was supposed to do the second one at Sydney uni and a week before my teacher substituted me with someone who was having a hissy fit about going to a...

wtf... You did all the hard work: | sin x + cos x dx = | sin x dx + | cos x dx = -cos x + sin x + c