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what exactly is the question? and is this year 11 or 12?

and can I work as a mechanical engineer with a chemical engineering course?

use momentum. mv(skater 1) = mv(skater 2) 60 x 5 = 95 x v 300=95v v=300/95 =3.16 m/s

f=ma -> a=f/m a=16/8.35 =1.916 now acceleration = (velocity final - velocity initial)/change in time therefore find velocity final by subbing values in 1.916 = (Vel final - 30)/3.6 Vel final - 30 = 1.916 x 3.6 Vel final = 6.8976 + 30 Vel final = 36.8976 m/s is that the given answer?

cool thanks

yeah it did thanks. just wondering cos i do similar subjects and mostly getting in the 70-80 mark.. which should hopefully scale to 80-90+... and do you think hsc or trials are harder?

just viewed your raw marks and was wondering what atar you received?

no, you actually look at the stoichiometry of lead nitrate to potassium iodide which is 1:2 because you're reacting it with the lead nitrate(given concentration) not the lead iodide (this is the product) Therefore moles of lead nitrate is half of moles of potassium iodide which is 0.006175/2 =...

thats okay. and yeah now that it is fast approaching hsc.. i should be doing past papers. thanks for the advice!

are you serious? wow! so I still have a chance then.

still undecidable between these two courses. I like physics and chemistry equally so not really sure which one to pick. plus i'm considering chemical engineering in unsw and mechanical engineering in uts, unsw or usyd (preferably UTS due to transport and its internship.) What course and uni do...

well you need to find the c of cacl2. you use c=n/v find the moles of the cacl2 only in 0.71 g which you know how to do. now for v, you need to add the 2h2o with the 250 ml. to get this, multiply the mole of cacl2 by 2 because every mole of cacl2 releases 2 mole of water (cacl2.2h2o) now convert...

with that concentration question.. what was the given answer?

why are you doing 2 unit if you're sig says that you're doing ext 2?

yeah socially balanced as well I agree with that but what about those who procrastinate sitting in front of there comp or playing some console games. don't you think that it will affect their hsc result if they don't stop their distraction. I mean people say to use it as a reward and all that...

but not all students are smart like you and needs that extra time to maximise their marks.

lol but to me, better future > 60 days of enjoyment

how will the student who comes 2nd and 3rd be affected during moderation? cos I get how rank 1 will not get dragged down internally but will rank 2 and 3 get dragged down if their class performance in hsc is poor but rank 1 2 and 3 do well externally.

what are the sacrifices you're making til hsc? my one is iPod touch and Facebook. what about you?

wow! yeah I think not answering the question cos I was set for that exam. and yeah hopefully I can. I needs smash hsc plus the guy coming second is only 1% behind me in our internal marks