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wait one sec, not sure if it matters but in the question it has less than or equal to signs? while u put less than signs?

Really? fuaaaaark haha thanks so much jennnnnnn!

I know this is a bit late lol, but can someone help me with question 8 b) (v) in the 2004 HSC exam ? here's the link http://www.boardofstudies.nsw.edu.au/hsc_exams/hsc2004exams/pdf_doc/maths_ext2_04.pdf Thanks

School rank ~20 English Adv - 38/124 Maths Ex1 - =2/91 Maths Ex2 - 8/40 Physics - =11/64 Chem - =6/72 Thanks :)

thanks! your max speed and displacement is right. But for some reason they have x= 4sin(4t) + 3cos(4t) as part of the answer. Is that the solution to the differential equation? How do you get that?

This is Q7 Excercise 25(c) from 3u Fitzpatrick $Solve the differential equation $ \frac{d^2x}{dt^2}+16x=0 $ subject to the conditions $ x=3 $ and $ \frac{dx}{dt}=16 $ when $ t=0. $ Find the maximum displacement and maximum speed if x metres is the displacement of a particle moving in a straight...

Good luck! Were the tests hard? what did they test u on anyway?

^ just wondering

Alright thanks guys! I'm ranked 7th for both maths and pretty sure I can get top 10 in phys and chem, just worried about english coz last year I was ranked 80th LOL. Guess I just gotta try harder for eng.

Wow, thats sick. I think I might actually achieve that! :)

Hey guise, just wondering what ranks I would need for a 99+ atar i go to school ranked around 20 subjects and approx. number of ppl doing them: 4u Maths (40) Chemistry (75) Physics (65) Eng Adv (120) btw English is my weak point and i know about 20 ppl get band 6 for chem/ phys each year and...

thanks so much :)

I need help with part ii) Its from the 2005 HSC

ok yeah its amphiprotic, but my question was why is it basic in water - does it just have a higher tendency to accept a proton from water than to donate one?

So, apparently Sodium bicarb solution has a pH of >7 in solution, so that must mean the HCO3- ion must accept a proton from water becoming carbonic acid and producing OH-. However im just wondering, what is stopping the HCO3- from donating a proton to water, producing H3O+, causing the solution...

I GOT IT!!!!!! Thanks alot! :)

\text {Using De Moivre's Theorem, show that }\tan3\theta =\frac{3\tan\theta-\tan^3\theta}{1-3\tan^2\theta}

Hey so for calculation questions, does it matter how many significant figures or decimal points you round off to? I know in Chem u round ur final answer to the lowest number of sig figs given in the question so is it the same for physics?

ok I get it now haha thanks so much for the taking the time to help! :)

sorry i still dont get it. I dont really see the evidence against the aether model. Einstein states that the speed of light is a constant but how does this mean that the aether does not exist? As in can't the aether exist, allowing light to pass through it AND the speed of light be constant? The...