**Applied Maths 2012 Before/After**

Osric

Wesc. wrote: »

Hope I got an A1... but I'm not 100% sure. Some of ye here got different answers to me for Q1 (b) so maybe I got that wrong, although my answers (38secs and 642.5m) seemed right at the time.

By the way, what did everyone get for Q2? Here are my answers:
(a) 71.46
(b) (ii) 13:21
(iii) 1.14 hours.

Got same as you for part b of q2 ( forgot to get the actual time relative to noon though ) Part a I made a mess of.
For 1 (b) the other lads in my class got the same as me, so I think those values are right, dunno

BL1993

Anyone do q8?

BrianC2095

BL1993 wrote: »

Anyone do q8?

Yea got the proof out fine but im pretty sure i just made up the second part but i got answers anyway

BL1993

BrianC2095 wrote: »

Yea got the proof out fine but im pretty sure i just made up the second part but i got answers anyway

I got Mass of pulley = 2m and some mad yoke for tension :P

afrocod

I got 4 and most of 1, the rest was a complete disaster. Anyone do 7, I drew two diagrams and that was that. I'll be lucky if I don't fail.

BrianC2095

BL1993 wrote: »

I got Mass of pulley = 2m and some mad yoke for tension :P

I dont think i got that whatever way i did it everything cancelled to leave I m and r Then i just put T into mg-T =ma and i assumed I was 0.5Mr^2 and I got the r^2 to cancel but i cant remember what I got
How did you do it?

Tankosaur

My answers, most of my classmates got the same as me for those so I'm pretty confident of them.

q1)a) 24.5 m
b)(i) 39.345s
(ii)48m

q2 a) 6.7 degress (I think this is wrong , not entirely sure of it)
b) (i)25 m/s and 73.74 north of east
(ii) 1:21
(ii)1.1426 hours

q3) a) 36.86 and 53.13 angles
(ii) time difference of 4 seconds EDIT: Typo had written 3 , 4 is correct.

b) 60 degrees and ii was 70m/s

5 was proofs ( very handy I must say)

9) 7.79 ( easiest q ever)
b) immersed part was 1.0881 m ( othe rpeople got 1.2 m)
angle was 64 degrees (other got 6o )

10) a) k was 7.757x10^-4(this depends on whether you used mins or seconds
(ii) was 52.66 degrees celcius

b) were handy enough proofs

Tankosaur

Wesc. wrote: »

Hope I got an A1... but I'm not 100% sure. Some of ye here got different answers to me for Q1 (b) so maybe I got that wrong, although my answers (38secs and 642.5m) seemed right at the time.

By the way, what did everyone get for Q2? Here are my answers:
(a) 71.46
(b) (ii) 13:21
(iii) 1.14 hours.

Different angle but exact same figures, weird

Tankosaur

Osric wrote: »

Thought the paper was fair, although some parts really hard

Here are my answers:

(1)
(a) 44.1m
(b) 40 seconds
352m

(3)
(a) 36.87 and 53.13 (roughly)
4 seconds
(b) 60 degrees
70m/s

(4)
(a) 1.23m/s
1/11m
(b) (4mg(1+u))/5
(2g-f)/3

(5)
(a) proof
(b) proof

(9)
(a) s=7.79
(b) 1.2m
Theta = 60

(10)
(a) k = ln(1.5) / 600 (in seconds)
Temp = 44.17 degrees (roughly)
(b) proof
Proof

I got the exact same fo everything bar all of q1 and my figures were slightly off yours for q9b, only slightly though.

Wesc.

Tankosaur wrote: »

q1)a) 24.5 m
b)(i) 39.345s
(ii)48m

q2 a) 6.7 degress (I think this is wrong , not entirely sure of it)

(ii) time difference of 3 seconds

I think I got the same, apart from the above.
For q1)a) I got 9g/2
For q1)b) (i) I got 38 secs and for (ii) 642.5m? 48m is a really small value..

For q2)a) I got 71.46.. but yeah I could be wrong too.. never came across an "apparent rain on windscreens" question before :L

For q3)a) (ii) I'm almost sure that's 4secs?

finality

Tankosaur wrote: »

q3) a) 36.86 and 53.13 angles
(ii) time difference of 3 seconds

Same angles, but I got 4 seconds

10) a) k was 7.757x10^-4(this depends on whether you used mins or seconds
(ii) was 52.66 degrees celcius

Got this value of k. I think that might have been what I got for the temperature too, though I can't remember exactly.

Tankosaur

Wesc. wrote: »

I think I got the same, apart from the above.
For q1)a) I got 9g/2
For q1)b) (i) I got 38 secs and for (ii) 642.5m? 48m is a really small value..

For q2)a) I got 71.46.. but yeah I could be wrong too.. never came across an "apparent rain on windscreens" question before :L

For q3)a) (ii) I'm almost sure that's 4secs?

SOrry about that q3 , t'was a typo.

I'm full sure my q1 is right. For 1a) I subbed in my value to the distance the first paticle travels in full flight and it came out perfectly. ANd for b) ii everyone I talked to got 48 too.

2 i'm not sure of but hey, who is?

Wesc.

For temperature I got 21.7 degrees? Did ye all realise it was after 25 minutes not 15 because it said a further 15 minutes? Or maybe I made a slight mistake.. not sure!

paddyhes

My answers:

Q1
(a) 44.1m
(b) (i) 40s (ii) 352m

Q2
(a)87 degrees (probably wrong)
(b) (ii) 13:07(12 seconds) (ii) 96 minutes

Q3
(a) (i) roughly 36 and 53 (ii) 4 seconds
(b) (i) 60 degrees (ii) 70m/s

Q4
(a) (i) root(2g/13) (ii) 1/11 m
(b) (i) (4mg(1+''mew''))/5 (ii) (3f-2)/6

Q5
(a) showed V1<V3<V4
(b) proof

Q10
(a) (i) k=roughly 6.75x10^-4 (used seconds) (ii) 41.77 degrees
(b) proof

BrianC2095

Wesc. wrote: »

For temperature I got 21.7 degrees? Did ye all realise it was after 25 minutes not 15 because it said a further 15 minutes? Or maybe I made a slight mistake.. not sure!

I just integrated from 60 to theta for temperature and from 0 to 15 for time doya think that is right ?

Wesc.

BrianC2095 wrote: »

I just integrated from 60 to theta for temperature and from 0 to 15 for time doya think that is right ?

I did the same for temperature but for time I did from 0 to 25 mins (1500s)

paddyhes

Wesc. wrote: »

For temperature I got 21.7 degrees? Did ye all realise it was after 25 minutes not 15 because it said a further 15 minutes? Or maybe I made a slight mistake.. not sure!

you got the difference = 21.7
the body is 20 degrees hotter than this value
the body's temperature is 41.7 degrees.

BrianC2095

Wesc. wrote: »

I did the same for temperature but for time I did from 0 to 25 mins (1500s)

well if it had already dropped to 60 in the first ten minutes then surely you dont have to take the first drop into account for the second drop do you? it drops in an interval of 15 minutes so why do you have to take the first interval into account if its seperate if you went from 80 to theta then ud use the full 25 minutes wouldnt you?

Wesc.

BrianC2095 wrote: »

well if it had already dropped to 60 in the first ten minutes then surely you dont have to take the first drop into account for the second drop do you? it drops in an interval of 15 minutes so why do you have to take the first interval into account if its seperate if you went from 80 to theta then ud use the full 25 minutes wouldnt you?

But isn't theta the difference in the temperature of a body and the surroundings? So at the start theta is 60 because that's 80 - 20..

Wesc.

paddyhes wrote: »

you got the difference = 21.7
the body is 20 degrees hotter than this value
the body's temperature is 41.7 degrees.

Ohhh, f*ck :P Yeah that sounds right so.

BrianC2095

Wesc. wrote: »

But isn't theta the difference in the temperature of a body and the surroundings? So at the start theta is 60 because that's 80 - 20..

Aw yea i misread the question damn i thought theta was the temperature of the body...... Still got 42 though somehow Ah well it looks like i was never gonna get my a1 :rolleyes:

Plonker!

Anyone confirm or deny these?

Q1 (a) 44.1m
(b) (i) 40secs
(ii) 352m

Q3 (a) 53.13 or 36.87
(b) (i) 60 degrees
(ii) 70m/s

Q4 (a) (i) 1.23m/s
(ii) 1/11 m
(b) (i) f*cked this up, I think (8/5)(mew)mg
for tension
Q5 proofs, lovely!

Q6 (a) (i)1.973 ( it was (1/5)pi^2 )
(ii) 5.9 N
(b) (i) 1.4 m/s

Q8 (a) Proof.
(b) 2m

Q10(a) (i) k=(1/600)ln(4/3)
(ii) 38.something can't remember

(b) proofs, handy 'nuff.

paddyhes

paddyhes wrote: »

My answers:

Q1
(a) 44.1m
(b) (i) 40s (ii) 352m

Q2
(a)87 degrees (probably wrong)
(b) (ii) 13:07(12 seconds) (ii) 96 minutes

Q3
(a) (i) roughly 36 and 53 (ii) 4 seconds
(b) (i) 60 degrees (ii) 70m/s

Q4
(a) (i) root(2g/13) (ii) 1/11 m
(b) (i) (4mg(1+''mew''))/5 (ii) (3f-2)/6

Q5
(a) showed V1<V3<V4
(b) proof

Q10
(a) (i) k=roughly 6.75x10^-4 (used seconds) (ii) 41.77 degrees
(b) proof

plonker ^

ganon

Woow, loads of the same answers as everyone, for 1,2,3 definitely, 4 was a bit dodgy but think my a is right, 10 i seemed to get a different k to everyone but got the next part as 41.77 so i dunno

For 5a, did anyone find they were getting e<thingy rather than e>thingy
I did so i just reversed the inequality at the end hoping that i'd forgot some rule that you're supposed to do that

Tankosaur

For q1 I wrote d = 24.5 (which it is I believe) then when testing if this is correct I worked out the total distance the first particle moved in that time which was 44.1 m.

But I circled the d=24.5 bit as I assumed it was what we were looking for, but the actuall value we were asked for was 44.1m.


I still worked out the total distance from P when the collided was 44.1m so will I still get full marks?

Dicksboro_man

made some stupid mistakes today, q10a was a nightmare for me, had no idea what to do with it :-/

I tried to study q6 outside school and did it as an extra question today but didnt even attempt the last part of, b (ii). how many marks ye reckon is gonna be going for 10a or 6b(ii)?

RedTexan

Did anyone try 6(b)(ii) i came out with k=1.56? it was 1.560000000 on the calculator and it was asked to 2 decimal places, made me confident at the time! Got 1.4 for the speed!

RedTexan

Dicksboro_man wrote: »

made some stupid mistakes today, q10a was a nightmare for me, had no idea what to do with it :-/

I tried to study q6 outside school and did it as an extra question today but didnt even attempt the last part of, b (ii). how many marks ye reckon is gonna be going for 10a or 6b(ii)?

Well for q6 (ii) I did a lot of work, had to get, used projectile vectors and all that and thought it was pretty clever the way it worked out, would be delighted if it was right! Well I would say that it was this year's trickiest, probably 10 marks I'd say.

Liveforrugby

That exam made me orgasm uncontrollably

ganon

Did anyone notice how much it was like the pres?
Q.1a was the same qustion as the pre questino that had root8ga in it (forget which company)
And 4.b was the same as one of the pres, except they gave you 7kg and 5kg (again forget which company)