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    (Original post by AmashQamar97)
    Anyone with realistic predictions on the grade boundaries?
    I think they'll be low, purely because it was a wierd paper
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    If you hold a pipe pumping water upward which way will you be pushed? Downward. So the reaction force is weight +sin55*force exerted by pipe. What did everyone get for maxiumum velocity of the oscillating system?
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    (Original post by AlistairMcDonald)
    struggling to remember, but I think i did basically the opposite curve to the epe one, crossing the epe one at 40, with a max of 50

    I got the same as you for the phase diff one too
    Okay, cause I drew my stationary point for KE at the max EPE point, and one girl in my class drew KE sitting along the x axis and this has puzzled me :/

    And that's somewhat nice to hear ahaha... I went over that phase question again and again and I was feeling pretty confident about it
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    (Original post by steph-carys)
    How did you folks draw the KE/EPE graph? Differences of opinion at school
    Inverted version of the potential energy graph, max at the same height as potential but when the potential is at a minimum. Starts and ends at same displacements.
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    (Original post by AmashQamar97)
    Anyone with realistic predictions on the grade boundaries?
    The june 2014 paper was the hardest paper of this series , grade boundaries were 39 for A,

    In my opinion this paper felt harder, but i think its 39/40/41 for an A.
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    (Original post by AmashQamar97)
    Anyone with realistic predictions on the grade boundaries?
    Predictions
    90UMS - 50 marks

    80UMS - 46 marks

    70UMS - 41 marks
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    (Original post by amashqamar97)
    anyone with realistic predictions on the grade boundaries?
    52 - 100
    48 - a*
    44 - a
    40 - b
    37 - c
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    How many marks do you think the boltzmann factor questions were worth in total (i left these blank)
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    (Original post by AmashQamar97)
    Anyone with realistic predictions on the grade boundaries?
    Based on the boundaries of june 2014 which was considered a hard exam, the A mark could drop as low as 39, so i'd say


    A-42
    B-38
    C-34
    D-30
    E-26
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    Do they ecf? I written the max KE was 80 not 50 to calculate Vmax?
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    (Original post by tobybes)
    Ok so ita probably not that helpful, I have the numerical answers I got.
    5.78
    3.45
    0.61 m
    1072 N
    5pi/4
    0.471
    0.666 (Hz or s)
    Masses 1.2 and 3.6 X 10^whatsits
    Mass of star : 6.41 X 10^31 kg
    0.925
    23300
    59800
    1.03x10^33 (can't remember the question haha)
    130.8 (shc)
    489
    11300mol

    Hoping that 90UMS is around 55. Paper 5 is horrific.
    Also,I think:
    CAP - 52
    A* - 47
    A - 42
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    (Original post by Asiimov)
    Inverted version of the potential energy graph, max at the same height as potential but when the potential is at a minimum. Starts and ends at same displacements.
    Damn, I botched up my graph then. Hopefully there will be full ecf for following calculations..
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    (Original post by TheFarmerLad)
    52 - 100
    48 - a*
    44 - a
    40 - b
    37 - c
    Are u retarded last years exam was much easier and was 43 for an a u spaz
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    (Original post by Jm098)
    Do they ecf? I written the max KE was 80 not 50 to calculate Vmax?
    Same fmll. Was going for 100% umsd
    too. Think I may miss out now
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    (Original post by Danny_L)
    Same fmll. Was going for 100% umsd
    too. Think I may miss out now
    Its actually so annoying isn't it haha now I realise why the boundaries are so low, so many silly mistakes
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    Anyone else absolutely hate that exam? Had a mini panic attack during it. Just gonna find a way to sell my soul for an A haha
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    (Original post by Danny_L)
    Same fmll. Was going for 100% umsd
    too. Think I may miss out now
    Hey same here! Plus I messed up the mass of S2... and the hose question...
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    F=(-GM1M2)/(R1+R2)^2
    F1=4pi^2M1R1/T^2
    R1=1.2times10^12
    R2=3.6times same power
    To find velocity use v=2piR/T
    I can't remember the exact answer but if process is correct the answer should be right as well.
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    was the paper out of 70?
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    (Original post by Danny_L)
    Same fmll. Was going for 100% umsd
    too. Think I may miss out now
    where did you get the 50 from? i wrote 80 too
 
 
 
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