2015 LC Maths Paper 1 - Higher Level - June 5th

Chef Tony · 05-06-2015 5:55pm

DarraghF197 wrote: »

I don't get how people got 15*. You found the slope in the previous part. Considering the X-axis was the horizontal, it was just the tan of the slope, as in, the change in y over the change in x.

Since the slope of the x-axis was 0, the formula simplified down to tan inverse of your derivation of the previous question , which was something along the lines of 0.2 or 0.02

simplyno1 · 05-06-2015 5:55pm

AnnaCU wrote: »

I got 41, uhh everyones answers are different

what did you get for the slope? not the degrees, the slope, in the previous Q. i got -0.02886

Kremin · 05-06-2015 5:56pm

Hopefully it'll be something like that year where they just gave everybody the marks because different methods had different results? lets hope lol

fin709 · 05-06-2015 5:56pm

They should have placed a message on the front saying just differentiate everything. Did anyone else fare well in the first section and then, literally not get any answer out in the last 3 questions?

Kremin · 05-06-2015 5:56pm

simplyno1 wrote: »

what did you get for the slope? not the degrees, the slope, in the previous Q. i got -0.02886

This is exactly what I got too.. then put in that for M1 and 0 for M2, got 16.66 degrees.

fin709 · 05-06-2015 5:56pm

simplyno1 wrote: »

what did you get for the slope? not the degrees, the slope, in the previous Q. i got -0.02886

I got that for something, i dunno what. I just remember that number

Cr4pSnip3r · 05-06-2015 5:57pm

That was not a good paper for me.

Peregrine · 05-06-2015 5:57pm

Kremin wrote: »

I'll do it tonight when the paper is posted on examination.ie

:eek:

Go rest/study! :P

Chef Tony wrote: »

What is the actual time they put the papers up at?

Usually around now or in the next hour.

dazzadazza · 05-06-2015 5:58pm

Kremin wrote: »

It was 14. You have to realise the ball goes down AND UP.. so you multiply by 2... but take away two at the end because it drops from 2metres and doesnt go up 2 metres again.

I honestly think i might have got 300/300 for that paper, did anyone else get 16* SOUTH OF EAST for the plane question? What I did was find the slope and let it equal to tanalpha

"16 South of East".. Fellow applied maths student?

Kremin · 05-06-2015 5:58pm

fin709 wrote: »

They should have placed a message on the front saying just differentiate everything. Did anyone else fare well in the first section and then, literally not get any answer out in the last 3 questions?

The oil question was actually surprisingly easy.... once you knew you just had to manipulate rates of changes..

m.xvii · 05-06-2015 5:58pm

Papers are up on examinations.ie

Doctorhopeful · 05-06-2015 5:58pm

Kremin wrote: »

I got the slope to be -.02 something, used tan0 and got 16.066*, then put 16* SOUTH OF EAST as the direction it was going in...

It was just a simple tan equation as you worked out the slope in the previous part! I got about 1.6 and rounded to 2. 16 seems WAY too steep considering it was only dropping 150m in 5000m

MmmPancakes · 05-06-2015 5:58pm

Kremin wrote: »

This is exactly what I got too.. then put in that for M1 and 0 for M2, got 16.66 degrees.

Tan inverse of 0.02886 is 1.6 degrees though lol

PotmBottom · 05-06-2015 5:59pm

Papers are up now

DarraghF197 · 05-06-2015 6:00pm

Kremin wrote: »

I got the slope to be -.02 something, used tan0 and got 16.066*, then put 16* SOUTH OF EAST as the direction it was going in...

I think my answer was a tenth off your's. I got 1.6 or 1.7.

Doing it now, inverse tan(.0288) is 1.65. By Tan0, is that what you meant?

dazzadazza · 05-06-2015 6:01pm

MmmPancakes wrote: »

For the oil question, did you get dV/dt = 1273.blah ml/min?

I got 12732.39545 ... Using my equations from that part I was able to prove the next part correctly so I think it might be right.

Bah_Humbug · 05-06-2015 6:02pm

Kremin wrote: »

I got the slope to be -.02 something, used tan0 and got 16.066*, then put 16* SOUTH OF EAST as the direction it was going in...

People getting 16 must have used 0.288 by accident instead of 0.0288, because that works out as 2

simplyno1 · 05-06-2015 6:02pm

Kremin wrote: »

This is exactly what I got too.. then put in that for M1 and 0 for M2, got 16.66 degrees.

thats abit more re assuring but our degrees answers are completely different..

The original equation was 0.0024x^3 + 0.09x^2 +cx +d, right?

AnnaCU · 05-06-2015 6:02pm

Did anyone else have trouble with Q2? It seems really easy but I could not figure out how to do it :P

fin709 · 05-06-2015 6:03pm

AnnaCU wrote: »

Did anyone else have trouble with Q2? It seems really easy but I could not figure out how to do it :P

Long division was key

Doctorhopeful · 05-06-2015 6:04pm

Bah_Humbug wrote: »

People getting 16 must have used 0.288 by accident instead of 0.0288, because that works out as 2

Yup tan-1 (0.288) gives 16.06 which is the number kremin is quoting

Kremin · 05-06-2015 6:07pm

Maybe I multipled the angle by 10 by accident? I'll try it,, You know what, I think i must have put .288 instead of .0288?

DarraghF197 · 05-06-2015 6:07pm

How did everyone do with forming an image with the plane? I was quite confused, hadn't studied images for a very long time! Ended up doing something that I knew was wrong. Wasn't bothered do it again because of the lack of space and no confirmed workings page (was afraid it was for the examiner!). Could have tried mess with midpoints and distances but wasn't bothered lol.

simplyno1 · 05-06-2015 6:08pm

Kremin wrote: »

This is exactly what I got too.. then put in that for M1 and 0 for M2, got 16.66 degrees.

thats abit more re assuring but our degrees answers are completely different..

The original equation was 0.0024x^3 + 0.09x^2 +cx +d, right?

Kremin · 05-06-2015 6:08pm

DarraghF197 wrote: »

How did everyone do with forming an image with the plane? I was quite confused, hadn't studied images for a very long time! Ended up doing something that I knew was wrong. Wasn't bothered do it again because of the lack of space and no confirmed workings page (was afraid it was for the examiner!). Could have tried mess with midpoints and distances but wasn't bothered lol.

I just wrote what you have to do to get from -x-5 or whatever to the point of inflextion and then added it to the point of inflection, we never did that... so hopefully a few attempt marks.

DarraghF197 · 05-06-2015 6:09pm

Kremin wrote: »

Maybe I multipled the angle by 10 by accident? I'll try it,, You know what, I think i must have put .288 instead of .0288?

Looks like 299/300 for you!

Are there gold medals awarded for maths for a flawless result or is that just Applied Maths and Accounting?

MmmPancakes · 05-06-2015 6:09pm

dazzadazza wrote: »

I got 12732.39545 ... Using my equations from that part I was able to prove the next part correctly so I think it might be right.

Here is my solution: http://prntscr.com/7dhn6y

Let me know if I messed up

theRB · 05-06-2015 6:09pm

Kremin wrote: »

I just wrote what you have to do to get from -x-5 or whatever to the point of inflextion and then added it to the point of inflection, we never did that... so hopefully a few attempt marks.

That's what you're meant to do. The answer was (x,y)

simplyno1 · 05-06-2015 6:09pm

Pretty sure the answer is 2 degrees. I have no idea where i went wrong.. got the right answer for the slope but when i mustve used the formula wrong

sdio · 05-06-2015 6:10pm

DarraghF197 wrote: »

How did everyone do with forming an image with the plane? I was quite confused, hadn't studied images for a very long time! Ended up doing something that I knew was wrong. Wasn't bothered do it again because of the lack of space and no confirmed workings page (was afraid it was for the examiner!). Could have tried mess with midpoints and distances but wasn't bothered lol.

Anyone else get (x,y) for the image?

***2015 LC Maths Paper 1 - Higher Level - June 5th***

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2015 LC Maths Paper 1 - Higher Level - June 5th