AQA A2 Mathematics MPC4 Core 4 - 9th June 2015 [Discussion & unofficial markscheme]

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Either 6 or 7 marks I think. 7 sounds about right. I think you would only lose a couple marks.

Does anyone know how many marks question 8a was out of? I didn't realise you had to find the constant once you integrated so I just rearranged it to x=f(t) but left C in. How many marks do you reckon I'd lose if I did everything else correct? Thanks

Reply 1481

Alicebrooke

Original post by laurenn1995

on the trig question r(cosx-angle) did anyone get r=root29 and angle +1.19??? Anyone?? Think that's what I put... And then x at max value 5.09 or something?

I got that☺️

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Reply 1482

JackThorpe7

All My answers, really not sure on the coordinates for E though.

Reply 1483

Tiwa

Am I the only one who put the x coordinate for Q in terms of cos? I got cos(\frac{3}{2}) as my value of p was \frac{3}{4}

Reply 1484

laurenn1995

Original post by vicki36

99.9% sure it was 7marks

Reply 1485

RastaMouse96

Original post by Alicebrooke

I got that☺️

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I got -1.19 ahhh

Reply 1486

datpr0

Original post by Eliott2406

For the differential equation what values did you have to substitute for x and t?

They worded it sneakily and said that "initially the pond is empty", or something to that effect. Therefore, the values you subbed in were t = 0, x = 0.

Reply 1487

CD223

Is there an unofficial mark scheme? That went so badly for me there's no point me making one.

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Reply 1488

Alicebrooke

How many marks do you think 90 ums will be?

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Reply 1489

RavinderKlair97

i'm sure it was -1.19 because max value when cos(x+1.19)=1, this happens when cos(0) so x+1.19=0 so x=-1.19

Reply 1490

JackThorpe7

Original post by CD223

Is there an unofficial mark scheme? That went so badly for me there's no point me making one.

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I put my answers up, Dif equation is wrong and not unsure on coordinates of e

(edited 8 years ago)

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Reply 1491

datpr0

Original post by RastaMouse96

I got -1.19 ahhh

Yes that's what x came to but they wanted the maximum value, and as you know there were two values in the range (1.19 and 2pi - 1.19) you got 5.09 :smile:

Reply 1492

hamza3256

I got 5.11 for the max value

Reply 1493

Emmanuel12344

Original post by Eliott2406

For the differential equation what values did you have to substitute for x and t?

I put in 0 for both

Reply 1494

antrum95

Original post by RavinderKlair97

i'm sure it was -1.19 because max value when cos(x+1.19)=1, this happens when cos(0) so x+1.19=0 so x=-1.19

yes or when it is 2pi.
They specified x >0 and <2pi.
therefor x max was 2pi-1.19 to 3.s.f :P

Reply 1495

datpr0

Original post by CD223

Is there an unofficial mark scheme? That went so badly for me there's no point me making one.

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Oh no

Reply 1496

CD223

I'm gutted. A* gone.

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Reply 1497

jamez870

I got E(23,4,0) and E(11,11,0)

Reply 1498

Eliott2406

Original post by datpr0

They worded it sneakily and said that "initially the pond is empty", or something to that effect. Therefore, the values you subbed in were t = 0, x = 0.