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for heisenberg's work...so we just have to know about his uncertainty principle and nothing else?

wow..that made it so much more clearer..thx

when rounding off..specifically for pH values and concentration of H3O+, do we stick with what conquering chem says.. ie.. decimal places of pH will equate to the number of sig.figs in the conc. ?? is this what bos wants/

when re-telling your experiment about rates of corrosion...when measuing, we normally go weigh it before n after etc...but what is it that we are weighing..what is the supposed mass lost? Fe(s) -> Fe2+ + 2e- everything should still be in that test tube??

qutoe from a book "an a.c. motor continuously produces a back-emf and so limits itself without the need for a series transistor" meaning a dc motor would need one but then for both ac and dc motors, the current enters the coil as AC (in ac its just via slip rings and for dc its via split ring...

for q22b... as you reduce the mag field..isnt that like pulling a north pole away from the bottom (ie. theres a north pole on hte other side of that loop and your pullin it away) so that means by Mr. Lenz that a south pole will be induced on the under-side of hte loop..so that means if you look...

i believe thats quite important..isnt that what einstein did in his main investigation into the photoelectric effect, where he discovered owrk function and the formula... E = % + KE nb: % is work function

u know that grip rule where the thumb points in direction of current and you curl your fingers and they show direction of hte magnetic field... so there is a mag field that goes into the page inside the loop... if u dont know the right hand push rule, then u can use fleming's left hand...

its similar to ampere's law, not hte actual formula..but the direction of forces and all that ie. same direction current will attract and diff direction current will repel hope this helps nb: this is jsut add on info..ignore this and read my next post if htis confuses u more

current will flow clockwise and you know how a mag field exists around a current carrying conductor...same goes for here if u look at the first curve thing (bottom left hand side of hte loop) there will be a mag field that goes into the page on the inside of loop then using hte right hand...

yes, there will be 5 water molecules condensed out of that particular reaction

wasnt this a series and sequences thread... anyway..series and sequences hasnt been asked in the 3u paper in donkey years..so i guess they wouldn't start now..would they

dont base your judgement about how the state went in the exam based on this forum...maths nerds hang out here on a daily basis just be happy with how u went.. im over hte moon with how i went.. i found it pretty straightforward...though there was a 5 minutes somewhere in there when i went...

"i enjoy numbers" said the 17 year old i loved the test!!! it was the awesome-est i see there will be more than a handful of number-loving-nerds with that minister's certificate of excellence..

sonjay thats a nice message... and i totally agree with... people should realise that there ARE nerds here but then again, just be happy with your mark instead, be more optimistic - 4u notes at the ready for the burn lol.. 4u is over...3u next to kill

sonjay... what school do you go to? you sound...very smart

what are the cut offs for each band?? -perplexed

Q7 b) was madness! i love how in a question you get past this ugly expression and end up with a pretty-er one got it all out imagine they didnt give you that assumption!! that wouldve hurt

what is the approx state average for 4u marks??

that was a pretty fair exam... as robo_145 said..its not hard, just time consuming