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  1. fingerscrossed2019

    School Trial Papers for the New Syllabus

    I've a few too and have pm'd.
  2. fingerscrossed2019

    I need help with a question thx

    My understanding is somewhat limited but I’ll have a go. 1. Yes, equilibrium in the barium oxalate continually dissolving and forming its precipitate. 2. Concentration: the concentration you are finding is the concentration of barium ions at the given ksp. These are dissolved in solution. The...
  3. fingerscrossed2019

    NEED HELP with simultaneous equation

    Those equations look right to me. For part b you could use a graphing tool like desmos if you don’t feel like drawing it as they are 2 straight lines, and you just want the point of intersection. Algebraically: Equate the expressions for d as when they meet they will be the same distance...
  4. fingerscrossed2019

    Prelim Doppler Effect Calculations

    Hi, for the following question: You are standing next to a train track when a train comes towards you at 28m/s sounding its 400Hz horn. What is the frequency you hear? The speed of sound at your location is 332m/s. A) 472 Hz B) 400 Hz C) 338 Hz D) 474 Hz I realise that you can rule...
  5. fingerscrossed2019

    Integration MC Question - North Sydney Boys 2017 Trial

    That's awesome and helps so much, thanks for your help!
  6. fingerscrossed2019

    Integration MC Question - North Sydney Boys 2017 Trial

    As the title says. Can someone help me with this question? The answer is C but I can't seem to understand why. My thinking is that the integral should be equal to 0, which rules out A and B. Then, looking at D I think it would calculate the area in some cases, but never calculate the integral...
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