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  1. Sirius Black

    Study in the Holidays

    I can't believe that new term is actually around the corner... I felt that I haven't done anything in this holiday:(
  2. Sirius Black

    a q

    Luigi Galvani first generated an electric current by using two different metal wires place separately on a freshly extracted frog muscle. List two chemical conditions, which enabled the generation of the electric current. The only condition that I know is “two different metals formed a...
  3. Sirius Black

    Study in the Holidays

    hey how would u study with no break from 7am to 7pm for every subject? 12hrs study, it sounds so surreal, seriously^-^
  4. Sirius Black

    roots of polynomial with real coeff

    wow cool i got it now....thanx a lot!:)
  5. Sirius Black

    roots of polynomial with real coeff

    that's what i thought too-real number has a conj of itself :uhhuh:
  6. Sirius Black

    roots of polynomial with real coeff

    If (2-sqrt3) is a root for a polynomial with real coefficients, is 2+sqrt3 also a root I thought this rule only applied to complex root and its conjugate right? but the solution says it it the way i stated above, which means (2+sqrt3) is a conj. of (2-sqrt3)?! Could anyone help?
  7. Sirius Black

    Hard Integration q

    prove that if Let U<sub>n</sub>=<MATH>&int; xcos<sup>n</sup>x dx</MATH> from o to pi/2 then U<sub>n</sub>=(n-1)/n U<sub>n-2</sub>-1/n<sup>2</sup>
  8. Sirius Black

    Physics Study thread - M&G

    can i ask a related question here on back emf ?:o As we know, in motors, there is start-up burn out risk bcoz no rotation-->no back emf-->large current=large emf/small resistence right? If it is so, then back emf should be considered as useful thing but why later on we have to laminate iron...
  9. Sirius Black

    Degree in a day

    hehe i got nominated today... How come no one pick Advanced maths :confused:
  10. Sirius Black

    help

    how to use sodium carbonate solution/bromine water and/or acidified potassium dichromate solution to distinguish b/w 1-butanol and cyclohexane? Edit: could we just use acidified potassium dichromate solution oxidise butanol into butanopic acid and then use sodium carbonate to tell the acid...
  11. Sirius Black

    Qs on water quality monitoring

    Q1. Identify two common indicators of water quality that would be the most useful in monitoring waste water from a fruit cannery. Justify your choices. [could anyone tell me what the main contaminations are present in the waste water from fruit cannery?] btw, could any1 summarise the main...
  12. Sirius Black

    Titration Comp

    stuffed up on last Satuday Last Saturday was really disarstrous for my team... one of my teammate broke the top of the burrette... so she used the broken one to finish up all her individual expt. We just narrowly missed out national final==+- and one team from Ruse got the trophy
  13. Sirius Black

    Intergration Constants

    I didn't get a constant in the end but I didn't use the ur substitution method
  14. Sirius Black

    Intergration Constants

    How would u get a "6" in an indefinite integration? It must be a definite integral then it doesn't require the "+c" thingie
  15. Sirius Black

    who's doing this topic?

    I am doing this elective too:p
  16. Sirius Black

    What texts hv u studied?

    I've done China Coin
  17. Sirius Black

    a quick question

    A point P on the rectangular hyperbola xy=4 has a tangent cutting x-axis at Q. From Q draw a line perpendicular to the tangent at P and this line cuts the hyperbolar at R, S. M is the midpoint of RS. hmm, the locus of M is found to be y=-4/x and what would be the restriction on this locus? I...
  18. Sirius Black

    wot topics have you done?

    wow. our school is really behind -we've only done POM, acidic and doing monitoring while having a 25% assessment on shipwreck
  19. Sirius Black

    1 on 1 tutor wanted

    I am looking for some one who can be my private tutor in chem/phys/maths ext 2 over the last 120ish days b4 HSC:) If u got over 99.90 UAI in 2003+ HSC(or chem/phys: 95+; maths ext2: 98+) and interested in tutoring, plz PM me or email to ccxtfchl@hotmail.com
  20. Sirius Black

    What texts hv u studied?

    Is anyone here interested in lauching a subforum for the texts we have studied so far?
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