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    Help!! Chemical properties of radioisotope.

    wikipedia is your friend. From what i can remember for cobalt-60, it has a half life of 6years and is a gamma ray emiiter so it can be used to preserve foods, by passing gamma rays through them and destroying microbes etc...
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    TUTORING for HSC 2009- 2/3/4 unit maths, biology, chemistry, business studies

    By internal marks she probably meant she got 90+ total from her school assessments.
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    Finding Equations of Curves

    given: f'(1)=0, f(1)=-2, satisfies (0,3) consider: f(x)=ax^2+bx+c 2a+b=0 using f'(1)=0 a+b+c=-2, using f(1)=-2 c=3, since the curve passes through (0,3) solving simultaneously... a=5,b=-10,c=3 these may be wrong as i did it in my head... therfore eq of curve : 5x^2+10x+3
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    What won't you miss about high school.

    There's ESL too :P
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    BORED of studies..?

    You'll understand once you get to year 11/12.
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    graphs?

    Eh aren't you in year 12, shouldn't you know the eq of a circle by now? anyway it's x^2+y^2=r^2 essentially for horizontal asymptotes you take the limit as x approaches plus/minus infinity.
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    "Assessment Rank Order from 13 November"

    Maybe someone dropped in the last minute? :D
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    Ranks just in! Argh!!

    Lol, how does this years HSC being hard or not have any effect on his UAI. The UAI is essentially a rank , so the hsc being hard/easy has no effect really...
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    "Assessment Rank Order from 13 November"

    Re: Ranking on Students Online I got mine yesterday.
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    "Assessment Rank Order from 13 November"

    In my case it's the other way around. Also, how come it asays the results will become available on dec30? on the my details page.
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    "Assessment Rank Order from 13 November"

    I moved up a rank in 2 subjects, so i take it the BOS takes into account decimal points? As i knew these were my ranks, however, my school doesn't factor in decimal points...
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    "Assessment Rank Order from 13 November"

    Yeah there are people that haven't received them yet and also it's to check that your ranks are right.
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    Ellipse, Auxilary Circle

    if i remember correctly the ellipse has the parametric coords (acos@,bsin@), the auxillary circle is simply a circle with parametric coords (acos@,acos@), i.e. x^2+y^2=a^2. The way my teacher taught it is it is essentially to help draw the ellipse....never really used it so i don't think it's...
  16. I

    Circular Motion Q

    v=rw, where w is the angular velocity, ( this is a 4 unit formula, no idea how you do it in physics) w=v/r=3/4 thus, the angular speed is 3/4
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    Explanation of HSC Marks (Moderating)

    I meant internally he killed everyone by like 10+ marks e.g 90,80,78,76... are the top 4 ranks marks but in the externalthe marks are: 95,94,93,92 does that mean the assessment marks of the other 3 will be dropped by a lot of marks?
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    Which faculty had the "best" Teachers?

    Mathematics/ Chemistry- the rest of the faculties failed :rolleyes:
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    Explanation of HSC Marks (Moderating)

    Really? what if there is one guy killing the whole grade by like 10 marks and he gets like 95 and the rest get marginally lower marks, does that mean the rest of them have no chance at a band 6?
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    Thoughts?

    Same as you for the first 2 can't remember what i got for the titration but i remember getting something along those lines.
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    Section I: Multiple Choice

    This is correct.
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    Section I: Multiple Choice

    who cares if shes a teacher from JRAHS? teachers make mistakes and the answer is B, i put C aswell however you're loging the amount of moles not the concentration of H30+
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