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    (Original post by james2mid)
    No
    (Original post by james2mid)
    No
    It clearly said recoiling nucleus.

    if its recoiling it mustve already emitted the alpha :smug:
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    (Original post by kingaaran)
    What was the unit - I worked it out to be C^2 kg^(-2)?
    Yeah i got that too
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    (Original post by Mattematics)
    I put -5Q, for the first one, was there a positive version?

    I also put -4 for the second one.
    I put the +5Q because I thought potential was a scalar but I have no idea now
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    For anyone wondering how to do the question about rearranging to find Ealpha (sorry it's a mess)

    E = KEnucleus + Ealpha

    V = -mv/N --> V^2 = m^2 v^2 / N^2

    v = -VN/m --> v^2 = V^2 N^2 / m^2

    KEnucleus = 1/2 N V^2 = 1/2 N (m^2 v^2 / N^2) = 1/2 m^2 v^2 / N

    Ealpha = 1/2 m v^2 --> v^2 = 2*Ealpha / mE = 1/2 m^2 v^2 / N + Ealpha

    E = 1/2 m^2 (2*Ealpha / m) / N + Ealpha

    E = m*Ealpha / N + Ealpha

    E = Ealpha (m/N + 1)

    Ealpha = E (1 / (m/N + 1))

    Ealpha = (N / (m + N))*E


    Also here's a poll http://www.thestudentroom.co.uk/show....php?t=4176490
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    (Original post by jjarra1997)
    I'm confused 😭😩 what question require you to work out energy for the capacitors? Cause I literally don't remember working out energy at all :s
    it was a MCQ where they gave us a capacitor which had a min and max value
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    (Original post by aelahi23)
    which question was this?
    pendulum
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    (Original post by TheLazyGuy1)
    Yeah i got that too
    I dunno what the actual answer was but I put A because there were only about 3 A's out of 25 otherwise
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    (Original post by duncant)
    what was the question again? I said he would to times his value of g by 4 to get the correct answer, is this right?
    I'm afraid it's the other way around. He would have had to divide his value for g by 4 to get the real value of g. In other words, his answer was 4 times bigger than the real value.
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    I put -3Q/4pier on one of the multiple choice ones.
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    (Original post by Maligaha)
    It asked for the direction of the force on x which was indeed y to x
    Yeah thats right
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    Such a nice paper I don't know how I made so many mistakes 😂😭

    Pretty sure I did better in the multiple choice
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    (Original post by Questioner1234)
    Thats what i put but like 5 people below this have said otherwise
    Oops sorry I meant 2F since 2x-1 before and 4x1 after, I hope I ticked the right one!
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    For the limitation I put dampening due to air resistance? Also on the MC, for the pendulum which one would have the largest amplitude? Overall I found section B okay, but the MC tricky.
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    (Original post by particlestudent)
    Ergh I done my graph like this, anyone else done it like this -_-
    yes.. i got something like that but i didnt go all the way down to zero... i stopped just before zero.. we should get atleast a mark for the shape of curve
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    (Original post by Questioner1234)
    I dunno what the actual answer was but I put A because there were only about 3 A's out of 25 otherwise
    Yeah it was A
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    (Original post by Mango Milkshake)
    1st one

    area under graph
    Oh right, thanks
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    does anyone remember all 25 questions (not just the letters)?
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    (Original post by jovdawesome)
    it was a MCQ where they gave us a capacitor which had a min and max value
    OMG thanks yeah i remember now! It was literally killing me that I couldn't remember, thought I skipped a Q Lool
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    (Original post by jovdawesome)
    yes.. i got something like that but i didnt go all the way down to zero... i stopped just before zero.. we should get atleast a mark for the shape of curve
    But eventually the gravitational field strength does become zero? It's a vector...
    I don't know if I done the shape correct, I think it should have had a decreasing gradient rather than increasing
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    (Original post by ombtom)
    For anyone wondering how to do the question about rearranging to find Ealpha (sorry it's a mess)

    E = KEnucleus + Ealpha

    V = -mv/N --> V^2 = m^2 v^2 / N^2

    v = -VN/m --> v^2 = V^2 N^2 / m^2

    KEnucleus = 1/2 N V^2 = 1/2 N (m^2 v^2 / N^2) = 1/2 m^2 v^2 / N

    Ealpha = 1/2 m v^2 --> v^2 = 2*Ealpha / mE = 1/2 m^2 v^2 / N + Ealpha

    E = 1/2 m^2 (2*Ealpha / m) / N + Ealpha

    E = m*Ealpha / N + Ealpha

    E = Ealpha (m/N + 1)

    Ealpha = E (1 / (m/N + 1))

    Ealpha = (N / (m + N))*E


    Also here's a poll http://www.thestudentroom.co.uk/show....php?t=4176490
    That question was a disgusting question

    (Original post by Hattie28)
    For the limitation I put dampening due to air resistance? Also on the MC, for the pendulum which one would have the largest amplitude? Overall I found section B okay, but the MC tricky.
    I talked about angles under 10 degrees.

    What was the answer to the worded question about momentum in a system?
 
 
 
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