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    (Original post by Z-Dust)
    Hated this test. For the 2nd 6 marker I chose Polyester
    i chose nylon and polyester.
    • it had equal tensile strength
    • similar stiffness/flexibility
    • nylon was lighter but had a much higher water absorbency so when both is wet they'd be around the same weight
    • they both sink in water too
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    I don't understand how it could be any that sink. It said it had to be light even when wet. If they sink then they must be heavy when wet. So it was the one that floats.
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    (Original post by aimeelovescats)
    I don't understand how it could be any that sink. It said it had to be light even when wet. If they sink then they must be heavy when wet. So it was the one that floats.
    you're thick. why'd you do the higer paper if you are gonna give such b-tec answers
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    (Original post by Kavinthan)
    you're thick. why'd you do the higer paper if you are gonna give such b-tec answers
    It is definitely the one that floats but not entirely for that reason.
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    (Original post by FlakeFace)
    It is definitely the one that floats but not entirely for that reason.
    i'll explain again.
    i chose nylon and polyester.

    • it had equal tensile strength
    • similar stiffness/flexibility
    • nylon was lighter but had a much higher water absorbency so when both is wet they'd be around the same weight
    • they both sink in water too

    the one that floats is the weakest so each time it snaps, it will need to be replaced and al though the kevlar one is strong, the other factors isn't good enough
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    Didn't Polyester and Polyethene essentially have trade offs? I thought they both were equally suitable. I don't remember the facts about nylon, though.
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    (Original post by Kavinthan)
    the one that floats is the weakest so each time it snaps, it will need to be replaced and al though the kevlar one is strong, the other factors isn't good enough
    I mentioned something along the lines of this as a point too.
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    (Original post by Kavinthan)
    you're thick. why'd you do the higer paper if you are gonna give such b-tec answers
    Why would u say that?
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    (Original post by AneebMMalik)
    Why would u say that?
    have you seen why i posted that
    that isn't what a higher candidate will do.
    apologies if the truth hurt
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    (Original post by Kavinthan)
    have you seen why i posted that
    that isn't what a higher candidate will do.
    apologies if the truth hurt
    An higher candidate wouldn't choose two materials when the question asks to choose the best material.
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    That test was quite straight-foward in the end. Most of the questions were concerning graphs which is fine by me. However the last 6 marker threw me because of the wording but looking back on it there was some obvious stuff I left out

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    hey guys, got the physics forum up and running
    http://www.thestudentroom.co.uk/show....php?t=3327315
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    (Original post by _Priyesh_)
    An higher candidate wouldn't choose two materials when the question asks to choose the best material.
    but is there anything wrong in me saying that those two are suitable polymers. just let me know what in my explanation is wrong...
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    (Original post by Kavinthan)
    but is there anything wrong in me saying that those two are suitable polymers. just let me know what in my explanation is wrong...
    In past similar questions the mark scheme only allows up to 2 marks I wrong material is chosen. May not be the case in this question due many people having different answers. I chose polypropene as it was the most lightweight, water resistant, the tensile strength may have been the lowest but it was still close to the other materials, (difference of 5). Don't remember the figures on flexibility.
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    I put the last polymer was the best cuz although its the weakest, there is only a little difference in strength between it and the other two. Moreover, its other properties will overcompensate for this etc...
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    can anyone remember what they put for the uses of crude oil?

    Did it have to be specific (e.g. kerosene) or general (fuels and lubricants)?
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    (Original post by MØRGS)
    can anyone remember what they put for the uses of crude oil?

    Did it have to be specific (e.g. kerosene) or general (fuels and lubricants)?

    The same question came up a few years ago, you have to put fuels and lubricants, you don't get marks for being specific as it asks for uses not examples
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    (Original post by Kavinthan)
    the maximum marks i would have lost is 17. that is disgusting. nomesayn. know what i'm sayin
    whats it for an A*?
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    (Original post by SusamS)
    The same question came up a few years ago, you have to put fuels and lubricants, you don't get marks for being specific as it asks for uses not examples
    Good!!! Thanks for the reply
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    (Original post by SusamS)
    The same question came up a few years ago, you have to put fuels and lubricants, you don't get marks for being specific as it asks for uses not examples
    Didn't this one say name two fractions in fractional distillation?
 
 
 
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