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    How many marks was question 4 all together?
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    How exactly did you determine the values for the final vector question? Pls help it will allow me to ascertain how many marks I may have lost
    • TSR Community Team
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    (Original post by Mattematics)
    xx
    Thanks for making this - great markscheme! I've tweeted it out so lots of people can see it
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    Agree with all :woo:
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    (Original post by Kay Fearn)
    How many marks was question 4 all together?
    7 xx
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    Soooo confused, why is the height of the cylinder 8!?!? literally need to see the question again because i'm sure the height was 9?
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    I somehow did t in terms of x... How many will I lose?

    Your thread seems a lot more accurate than mine, I'll delete my one
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    never fear the top hat is here, i am here to correct ur mistakes xd
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    Why did I get 3Pi+31/Pi +11 instead of 3pi+ 62/Pi + 22???
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    For the volume on 7b I got something like V=\frac{1637}{5}\pi
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    How marks do you think I'll have lost if for the last part of question 8 I had lamda as 5/2 not 2/5 ? The question was out of 5
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    [QUOTE=Engineerrookie;66068573]
    (Original post by Mattematics)
    Pretty sure every answer is now correct. Enjoy
    Question 3:
    Spoiler:
    Show
    Isn't the answer 3Pi + 31/ Pi + 11????
    I think i got the same as you!!
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    (Original post by The_Big_E)
    For 5a, it was dy/dx = -5root3/16, not x
    How many marks was question 4?
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    [QUOTE=huwgerard1;66068949]
    (Original post by Engineerrookie)

    I think i got the same as you!!
    I can't understand why it would be wrong tbh

    If x= 3 and y= 1/2 and we are finding where the normal to curve at that point intersects the x axis
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    7 a) k was -8.5 i double checked it into original equation
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    for question 7d, i did not put an exact value instead i got 2.something
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    (Original post by ombtom)
    I think your answer to 2(c) is right
    I got 4/3ln2 -7/9 instead
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    Full marks

    Makes up for C3.
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    (Original post by Sapereaude54)
    How exactly did you determine the values for the final vector question? Pls help it will allow me to ascertain how many marks I may have lost
    Spoiler:
    Show
    Let E be a general point on the line l_{2}

    So \mathbf{r} = \begin{pmatrix} 1-5\lambda \\ 5+4\lambda \\  2+3\lambda \end{pmatrix}

    Find PE:

    \vec{PE} = \begin{pmatrix} 1-5\lambda \\ 5+4\lambda \\ 2+3\lambda \end{pmatrix} - \begin{pmatrix} 1 \\ 5 \\ 2 \end{pmatrix}

    So \vec{PE} = \begin{pmatrix} -5\lambda \\ 4\lambda \\ 3\lambda \end{pmatrix}

    Now we know that \vec{AP} = \vec{PE}

    Therefore the lengths are the same, as the length of \vec{AP} = 2\sqrt{2}

    You know that |\vec{PE}| = \sqrt{(5\lambda)^{2} + (4\lambda)^{2} + (3\lambda)^{2}} = 2\sqrt{2}

     \sqrt{50\lambda^{2}} = 2\sqrt{2}

    50\lambda^{2} = 8

     \lambda = \pm \dfrac{2}{5}

    Then use this lambda with the general point equation \mathbf{r} = \begin{pmatrix} 1-5\lambda \\ 5+4\lambda \\ 2+3\lambda \end{pmatrix}
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    Wohooo I *think* I might have got 100% based on these answers Defo made up for that C3 washout haha.
 
 
 
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