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  1. kawaiipotato

    General Thoughts: Physics

    Anyone got q21? The height of the wall? I found grqdient of line and subbed into y = ut +1/2 a_y t^2 where u = 0 and t = gradient. Lol dunno if its correct
  2. kawaiipotato

    General Thoughts: Mathematics Extension 1

    lol Did you actually make that up just then..???
  3. kawaiipotato

    Carrotsticks' Solutions 2015 Extension 1 HSC

    For Q13 (a) (iii) Instead of using the previous parts (or using SHM properties), was it fine to just let v^2 = b(x-3)(x-7) (since they said it was a parabola) Subbing (5,11) giving b = -11/4 ==> v^2 = -11/4 (x-3)(x-7) v^2 = 11/4 (4 - (x-5)^2) and equating?
  4. kawaiipotato

    General Thoughts: Mathematics Extension 1

    1/tan or tan(90-theta)
  5. kawaiipotato

    General Thoughts: Mathematics Extension 1

    I left it as 2000/sqrt(cot^2(13)-cot^2(15)) and came back to it and wrote 910
  6. kawaiipotato

    Extension 1 predictions?

    Oh oops forgot lol. And the one in 3u this year was done by following a similar pattern from (i) and (ii) where you replace 7 games with n+k games and sum over all possible amount of games (where k = 1,2,...,k+1) as shown above by InteGrand.
  7. kawaiipotato

    General thoughts: HSC chemistry 2015

    I think it would. The horizontal axis is for the independent variable and the vertical axis is for the dependent variable. Iirc, the thing that we changed was the time so that would be on the horizontal.
  8. kawaiipotato

    Extension 1 predictions?

    There was no probability in the 4u paper besides the multiple choice one.
  9. kawaiipotato

    General Thoughts: Mathematics Extension 1

    Was c = 5, a = 2, n = sqrt11 /2?
  10. kawaiipotato

    HSC 2015 MX1 Marathon (archive)

    Re: HSC 2015 3U Marathon Another alternate method S = x (1 + 2x + 3x^2 + 4x^3 + ...) S/x = 1 + x + x^2 + x^3 + x^4 + ... .............+ x + x^2 + x^3 + x^4 + ... ...................+ x^2 + x^3 + x^4 + ... .............................+ x^3 + x^4 +...
  11. kawaiipotato

    Maths Extension 2 thoughts

    94 or 95
  12. kawaiipotato

    Probability Question

    How come we need to arrange it? I didn't think it would matter that it was something like P,P,S,S,S or P,S,P,S,S
  13. kawaiipotato

    Physics knowledge tests

    For Space q50 why isn't it 0.99 x 3x10^8 x (half life of muon after time dilation) = 0.99x3x10^8 x (2.2)/(sqrt(1-0.99^2 ) ? and why isn't it the same as q52
  14. kawaiipotato

    Physics knowledge tests

    E+n means x 10^n So E+11 means multiply by 10^11
  15. kawaiipotato

    HSC Physics Marathon 2013-2015 Archive

    re: HSC Physics Marathon Archive I just realised it. I thought the main thing was that in A the right wire went under the left one twice and for C it did it twice.. didn't see that one went under and the other was over
  16. kawaiipotato

    HSC Physics Marathon 2013-2015 Archive

    re: HSC Physics Marathon Archive O.o stared at it and it just looks like the negative terminals go on the same end in A and C...
  17. kawaiipotato

    HSC Physics Marathon 2013-2015 Archive

    re: HSC Physics Marathon Archive And why is A and C the same lol
  18. kawaiipotato

    HSC Physics Marathon 2013-2015 Archive

    re: HSC Physics Marathon Archive If i used right hand grip rule for A wouldn't it mean the magnetic field goes from left to right? Allowing it to rotate clockwise too
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