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    (Original post by SalazarSlytherin)
    ****
    yes
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    (Original post by julesaquilina)
    I mentioned about the area being pi r^2 but then i crossed it outtttt, and i spoke about weighing the cylinder on a balance and multiplying by 9.81 for the force
    Couldnt you you use a newton meter? To measure the weight of the cylinder

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    How are you supposed to get the density of the cylinder? I got really confused, not knowing which mass to use where, and not knowing the volume
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    Fell free to contribute to the unofficial markscheme.
    https://docs.google.com/document/d/1...it?usp=sharing
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    I did exactly the same as you and got 6.75, and had no idea why it didnt match any of the answers, so ended up putting 12mW fml
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    (Original post by Fish40)
    Couldnt you you use a newton meter? To measure the weight of the cylinder

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    Possibly, i also spoke about the area of the table but i think i shouldnt have
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    (Original post by Fish40)
    Couldnt you you use a newton meter? To measure the weight of the cylinder

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    I considered it, but thought it was a bit cheeky considering the diagram in the next question :P
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    How was it the momentum time graph? Fairly sure it was the accerleration time graph, since only acceleration could be zero out of the four if the ball was moving.
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    (Original post by yelash)
    How are you supposed to get the density of the cylinder? I got really confused, not knowing which mass to use where, and not knowing the volume
    I used the weight of the cylinder/9.81=mass of the cyclinder

    then I took the difference between the two newton meter readings = the upthrust on the cylider = Apgh

    deduced h from that. Used H and A to find the volume

    Mass/Volume = density.

    Anyone else do it like this? answer I got was around 750
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    yeh
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    [QUOTE=sddsfsdafs;65109861]How was it the momentum time graph? Fairly sure it was the accerleration time graph, since only acceleration could be zero out of the four if the ball was moving.[/QUOTIf it was momentum the momentum would not decrease at all so it must be acceperation as F=ma so they are identicall and directly proportional
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    Is anyone going to do an unofficial mark scheme?

    Also what do you think the grade boundaries will be?

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    (Original post by viktorh)
    I used the weight of the cylinder/9.81=mass of the cyclinder

    then I took the difference between the two newton meter readings = the upthrust on the cylider = Apgh

    deduced h from that. Used H and A to find the volume

    Mass/Volume = density.

    Anyone else do it like this? answer I got was around 750

    I did the first 2 steps what you said and half of the 3rd step, do you think I can get a mark or 2?
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    https://docs.google.com/document/d/1...it?usp=sharing

    APOLIGIES Can edit the unoffical mark scheme now.
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    On the whole, how did everyone find it?
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    (Original post by viktorh)
    I used the weight of the cylinder/9.81=mass of the cyclinder

    then I took the difference between the two newton meter readings = the upthrust on the cylider = Apgh

    deduced h from that. Used H and A to find the volume

    Mass/Volume = density.

    Anyone else do it like this? answer I got was around 750
    ah yeah makes sense. Exam stress got to me
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    i made a error whilst working out the velocity of the atom. Like i forgot to put negative velocity because it changed direction. I believe it was 4 marks how many would i loose considering everything else was consistent?
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    Pretty sure it was momentum time graph because the gradient was Ft, which is change in momentum(impulse), so a momentum time graph would have the same gradient.
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    what did you guys get for the drift velocity of the electrons I got some crazy answer of 10^7 but couldn't see where I went wrong?
 
 
 
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