AQA MM1B and MPC3 exams January 23 2013Watch

Announcements
Poll: After these 2 exams, how would you rate them?
Mechanics: Easy (4)
8%
Mechanics: Okay (10)
20%
Mechanics: Could have been better (7)
14%
Mechanics: I've failed (2)
4%
Core 3: Easy (12)
24%
Core 3: Okay (4)
8%
Core 3: Could have been bettwe (8)
16%
Core 3: I've failed (3)
6%
Thread starter 6 years ago
#1
Mechanics and Core 3, how do we feel about these exams?
0
6 years ago
#2
Has anyone got the AQA M1 Jun 2012 Paper
0
6 years ago
#3
To sum up the core3

Prove a (sum) = cosec^2(x)

Then use that

To say cosec^2(x) - cosecx - 3 - 0

Doesn't factorise,so then use the formula

Get cosecx values from formula

Do 1/answers to get sinx

Then do sin^-1(1/answers) to get x values,then do 180-(answers) +-360

In other words a whole world of hell in some questions!

------------------------------------------------------------------------
The last question literally I have no idea how to finish:

From integral between x and y of sec^4 (x) root(tanx)

u = tanx so du/dx = sec^2(x)

So therefore integral of 4 and 0 between sec^2 (x) root (u)

WTF do you do from here.....
0
6 years ago
#4
cosec^2(x) - cosecx - 3 = 0, this didnt factorise as you pointed out, what i done was to plug the equation into my graphics calculator as a quadratic equation (x^2-x-3=0), this forced out two horrible answers of x=2.3027 and x=-1.302, then using these values as cosecx i worked my way through this question, seems wrong though!
0
6 years ago
#5
(Original post by 2013mercs)
cosec^2(x) - cosecx - 3 = 0, this didnt factorise as you pointed out, what i done was to plug the equation into my graphics calculator as a quadratic equation (x^2-x-3=0), this forced out two horrible answers of x=2.3027 and x=-1.302, then using these values as cosecx i worked my way through this question, seems wrong though!
everyone got this...its right
0
6 years ago
#6
Thats good, a mate of mine had me worried because he made cosec^2(x)-cosecx=3, factorised LHS to
cosecx(cosecx-1)=3, then either cosecx=3 or cosecx=4,

The very last question, i ended up with a fraction
0
6 years ago
#7
(Original post by 2013mercs)
Thats good, a mate of mine had me worried because he made cosec^2(x)-cosecx=3, factorised LHS to
cosecx(cosecx-1)=3, then either cosecx=3 or cosecx=4,

The very last question, i ended up with a fraction
Your friend's logic doesn't work. If cosecx = 3 then his equation gives 3*2=6; if cosecx=4 then he should get 12. it's inconsistent. the correct method was quadratic formula to get, like, {1 +/- rt(13)}/2
0
6 years ago
#8
did anyone do M1?
0
6 years ago
#9
the last question on projectiles....
finding the horizontal component of velocity:
was it - displacement x time
(or) distance (divided by) time :/

finding the initial speed,
u find the vertical and horizontal components of velocity... and then find the magnitude
however i just realised that gives u the FINAL velecity and not the INITIAL velocity, so i'm wondering did we need to use a SUVAT equation to find U? it was 5 marks afterall :/
0
6 years ago
#10
(Original post by KING2011BOB)
To sum up the core3

------------------------------------------------------------------------
The last question literally I have no idea how to finish:

From integral between x and y of sec^4 (x) root(tanx)

u = tanx so du/dx = sec^2(x)

So therefore integral of 4 and 0 between sec^2 (x) root (u)

WTF do you do from here.....
The integral was pie/4 and 0 btw. But then you make U in terms of sec^2x, so you square both sides so U^2 = tan^2x, then add 1 so U^2 + 1 = tan^2x + 1. With the identity it means U^2 + 1 = sec^2 so then you just subsitute in U^2 + 1.

Then it is (U^2 + 1) root U dU then from there multiply out brackets and integrate
2
Thread starter 6 years ago
#11
Dammit, just realised i made a stupid mistake on the 8 mark subsitution Q
0
6 years ago
#12
Didn't think it went brilliantly, knew I could have done so much better, however I did get the substitution and trig question right, so I'll take that as a positive!
0
6 years ago
#13
Nailed the substitution question, but that trig question was awful. When I saw the question didn't factorize I used the quadratic formula to punch out two awful values making me think my calculation was wrong and moved on. The paper overall was pretty tricky, some pretty awkward questions.
0
Thread starter 6 years ago
#14
(Original post by AvaSofia)
Didn't think it went brilliantly, knew I could have done so much better, however I did get the substitution and trig question right, so I'll take that as a positive!
They happen to be the 2 questions I've just found out I made terrible mistakes on
0
6 years ago
#15
In M1, question 7c how many marks will I lose for using r=ut+1/2at^2 to find the time instead of v=u+at?
0
6 years ago
#16
(Original post by primo2gd4u)
did anyone do M1?
i did

what did you get for the vector question
the last part, finding the distance?
0
6 years ago
#17
i thought M1 was alright
last question was confusing, i had to find alpha first then find V
ended up with 26.2 ms-1 and 39.1 degrees. anybody get the same?
1
6 years ago
#18
(Original post by ravxo)
i thought M1 was alright
last question was confusing, i had to find alpha first then find V
ended up with 26.2 ms-1 and 39.1 degrees. anybody get the same?
I got the same angle but I think I got a different velocity, because my horizontal component was 16
0
6 years ago
#19
(Original post by ravxo)
i did

what did you get for the vector question
the last part, finding the distance?
45.6m which is the magnitude of the position vector [28 36] found from a time of 12 seconds.
1
6 years ago
#20
(Original post by SherlockHolmes)
45.6m which is the magnitude of the position vector [28 36] found from a time of 12 seconds.
i got a different answer
0
X

new posts
Back
to top
Latest
My Feed

Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

University open days

• University of East Anglia
Sun, 20 Oct '19
• University for the Creative Arts
Sun, 20 Oct '19
• University of Gloucestershire
Sun, 20 Oct '19

Poll

Join the discussion

Have you made up your mind on your five uni choices?

Yes I know where I'm applying (56)
66.67%
No I haven't decided yet (18)
21.43%
Yes but I might change my mind (10)
11.9%