How was IAL C34?

Scroll to see replies

anyone have the paper/ms?

Not yet but it will probably be available in 3 to 4 days. I'm not sure about the mark scheme. Instead, model answers will be available with the question paper.

Reply 21

majidabdul

How was paper on a scale of 1-10 10 being hardest

Reply 22

Mohammad_besani

how about the Vector Question ?

Reply 23

wenogk

Original post by majidabdul

How was paper on a scale of 1-10 10 being hardest

6.5

Reply 24

Imperion

Original post by Ayman!

Well, it is a June paper so I see it being similar to June 2015 and 2014.

Correct, a = -1/4. I think the coefficient of x³ = 23/16.

Are they usually much different?

Original post by TheMadHatteress

OH MY GODDDDD that integration by parts one!!!! :frown:

i got the answer you got, first then it seemed a bit fishy because there was ln^2 at the bottom idk what clicked in my brain but in a sudden moment of stupidity i re-did it as u=2^x and dv/dx= x :frown:

do you think I'll get a mark for this atleast? God I really feel like killing myself right now!!

I think they might consider it if you didn't cross it out. Well at first I thought I was wrong but I kept getting In256-3/(In2)^2 and was like fudge it :tongue:

Reply 25

Imperion

Original post by majidabdul

How was paper on a scale of 1-10 10 being hardest

7 purely on the fact there are harder papers

Reply 26

Ayman!

Original post by Imperion

Are they usually much different?

Jan 2014: 100/125 (112 A*)

Jun 2014: 89/125 (102 A*)

Jan 2015: 96/125 (109 A*)

Jun 2015: 89/125 (101 A*)

Jan 2016: 105/125 (115 A*)

Take a look at the trend. The Jan papers seemingly always have high boundaries, despite being more conceptually difficult at times. 89 for an A is ridiculously low tbh.

Reply 27

Imperion

Original post by Ayman!

And I was thinking of sitting my next batch in Jan :laugh:

89 is a gift from heaven :biggrin:

Spoiler

Reply 28

chhhhelsie

Lots of silly mistakes coming in my mind. So long A* btw OP how do you even remember all these ? I assume you finished the paper super fast and checked everything from scratch? lol

Reply 29

Ayman!

Original post by chhhhelsie

Lots of silly mistakes coming in my mind. So long A* btw OP how do you even remember all these ? I assume you finished the paper super fast and checked everything from scratch? lol

You're correct - I finished it in 1 hour 30-35 mins flat. :lol:

I had enough time to redo each question. I can't for the life of me remember the trig answers though

(edited 7 years ago)

Reply 30

SaadKaleem

Original post by Ayman!

You're correct - I finished it in 1 hour 30-35 mins flat. :lol:

I had enough time to redo each question. I can't for the life of me remember the trig answers though

Lucky you, I guess doing higher and tougher modules makes C34 piss easy. lol

Reply 31

SaadKaleem

Original post by Ayman!

I can't for the life of me remember the trig answers though

All I remember is that, after the trig proof question, I got 2 solutions in pi's for the 1st trig equation and 1 solution (in decimals) for the 2nd equation.

(edited 7 years ago)

Reply 32

Ahmed200705

Original post by Ayman!

Any boundary predictions or answers?

Here are the few I remember - will add to the OP as people post. :smile:

Area of the triangle = 18√11

Time: t = 11.63

Inequality: 2/3 × (a - b) < x < 2(a + b)

∫x(2^x) dx = (8ln2 - 3)/(ln2)^2

Upper limit = 3000, k = 0.614, nearest integer for dP/dt = 9

Volume of revolution = 17pi/10

Binomial expansion: a = - 1/4, coefficient of x³ = 23/16

Trapezium rule: approximation ≈ 0.875, exact = -3 + √15, magnitude of error = 2 × 10^-3

EDIT: RIP LaTeX. :frown:

are you sure about the area of the triangle :/ i got a different answer. please tell me how you ended up with 18√(11)

thank you

Reply 33

SaadKaleem

Original post by Ahmed200705

are you sure about the area of the triangle :/ i got a different answer. please tell me how you ended up with 18√(11)

thank you

From previous part, you had to make a triangle from cos theta and find an expression for sin theta, and then apply area of triangle formula and show your working as surds and finally get 18√(11), thats what I did.

(edited 7 years ago)

Reply 34

Ahmed200705

I didn't understand the upper limit question :/ , how do you find it out?

Reply 35

Ayman!

Original post by Ahmed200705

are you sure about the area of the triangle :/ i got a different answer. please tell me how you ended up with 18√(11)

thank you

½|XB||XA|sinC and then checked by using ½|XA × XB|.

Original post by Ahmed200705

I didn't understand the upper limit question :/ , how do you find it out?

9000exp(kt)/[3exp(kt) + 7]
= 9000/[3 + 7exp(-kt)]

t → infinity
exp(-kt) → 0

lim P = 3000

Original post by SaadKaleem

Lucky you, I guess doing higher and tougher modules makes C34 piss easy. lol

Nah, I'll admit. I didn't do any C34 over the year until last week when I started past papers from Jan 14. 1.5 hours a pretty long time when you compare it to Zacken who does them in 45 mins. :tongue:

(edited 7 years ago)

Reply 36

Rkai01

Can someone post the paper or model solutions to c34 please?

Reply 37

edothero

How difficult were the C4 questions guys?

Reply 38

Ayman!

Original post by edothero

How difficult were the C4 questions guys?

I thought the C3 section was more different personally. The C4 section was standard - no tricky vectors or integrals. There was one rate of change that could have been challenging, but they pretty much guided you through it by saying "express this in partial fractions", "show that dh/dt = blah" and all.