Recent content by fartman

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...