LC Off Topic Thread (2015/16)

Take Your Pants Off · 16-01-2016 4:02am

Anyone done 2012 maths paper 1 qs.7?
if so can you please tell me how to do part (f).

skippy1977 · 16-01-2016 10:20am

Tricky question - parts (a) and (b) easy and then there is some tricky calculus for (c) and then (d),(e) and (f) require previous answer to solve.
The (f) part requires the solution to the (e) part.
If you have solved (e) correctly then v=-27.04 root h

Sub this in for v in the (f) part. You can now divide both sides by root h and solve for c.
Note, this solutions assumes you have solved the parts up to (f) correctly.

Take Your Pants Off · 16-01-2016 1:40pm

skippy1977 wrote: »

Tricky question - parts (a) and (b) easy and then there is some tricky calculus for (c) and then (d),(e) and (f) require previous answer to solve.
The (f) part requires the solution to the (e) part.
If you have solved (e) correctly then v=-27.04 root h

Sub this in for v in the (f) part. You can now divide both sides by root h and solve for c.
Note, this solutions assumes you have solved the parts up to (f) correctly.

Thank you, yh I now get how they do it, but why ?
Why use the answer from the previous, where does it say in the question ?

skippy1977 · 16-01-2016 2:06pm

So the key here is 'what is v?'

Well they tell us in part (f) that v is the 'speed of water coming out of a hole like this'
In part (e) they ask us to find 'the speed of the water coming out of the hole...well they ask us to show it is a multiple of root h...but we must find it to show that.

So we find the speed of the water coming out of the hole in part (e) and it is -27.04 root h....and now that we know this is the speed of the water coming out of the hole (v) we can let this equal to c root 1962h

Tricky. Tricky to explain too so apologies if the above is not that clear. I can post the images of my solution in the afternoon it might look a bit clearer.

Take Your Pants Off · 16-01-2016 2:51pm

skippy1977 wrote: »

So the key here is 'what is v?'

Well they tell us in part (f) that v is the 'speed of water coming out of a hole like this'
In part (e) they ask us to find 'the speed of the water coming out of the hole...well they ask us to show it is a multiple of root h...but we must find it to show that.

So we find the speed of the water coming out of the hole in part (e) and it is -27.04 root h....and now that we know this is the speed of the water coming out of the hole (v) we can let this equal to c root 1962h

Tricky. Tricky to explain too so apologies if the above is not that clear. I can post the images of my solution in the afternoon it might look a bit clearer.

Thank you, I completely understand now. You explained it really good.

emersyn · 17-01-2016 1:02am

For the aurals in language exams, does anyone know approximately how much time we'll get to read over the questions before the CD starts?

Take Your Pants Off · 24-01-2016 4:12am

What are peoples thoughts on "effect of IAA on plant tissue" experiment. Recently my teacher told us that its carcinogenic and that she does not expect to see any full experiment qs coming up on it. Well I just had a look at the trend for it. Seems like every 1 year gap it took then came up from 2004. But has not come up since 2012.
If your still supposed to study it, its bound to come up this year.

Bazinga_N · 24-01-2016 12:12pm

Take Your Pants Off wrote: »

What are peoples thoughts on "effect of IAA on plant tissue" experiment. Recently my teacher told us that its carcinogenic and that she does not expect to see any full experiment qs coming up on it. Well I just had a look at the trend for it since 2004, and it seems like it popped up every 2nd year. But has not come up since 2012.
If your still supposed to study it, its bound to come up this year.

It came up last year in q.8 (c)?

Take Your Pants Off · 24-01-2016 12:21pm

Bazinga_N wrote: »

It came up last year in q.8 (c)?

Might have overlooked it
Pretty much sums it up so. Its still asked.

cxxlin · 25-01-2016 12:23am

I've literally been procrastinating for the past week by playing Piano Tiles like mad.
Probably gonna fail my mocks, but on the bright side, at least I'm skilled at tapping tiles like mad.

spurious · 25-01-2016 1:44pm

Mr Murphy wrote: »

Anybody have information on an external candidate for subjects like history being signed off? Biology, physics etc. Can I use the experiment copy that I used last year for them? Any advice is welcomed, thanks!

Sorry, just saw this.
Rules here regarding various subjects. Scroll down.

emersyn · 31-01-2016 3:05pm

Does anyone know what the n=x bit on these mean? Does it mean that in the first term of the sequence, n = 0 or 1 or whatever?

Peregrine · 31-01-2016 3:25pm

emersyn wrote: »

Does anyone know what the n=x bit on these mean? Does it mean that in the first term of the sequence, n = 0 or 1 or whatever?

Yes.

http://www.mathsisfun.com/algebra/sigma-notation.html

Leavingcert gal2016 · 01-02-2016 10:57pm

Is it possible to get 500 points in lc if I haven't done any work up until this point?

emersyn · 01-02-2016 11:38pm

Leavingcert gal2016 wrote: »

Is it possible to get 500 points in lc if I haven't done any work up until this point?

Nothing is impossible regarding leaving cert points, if you've done absolutely nothing up to this point it would be quite difficult to get 500 points but certainly not impossible

cxxlin · 03-02-2016 11:53pm

I am scarily chill even though I have my mocks tomorrow morning... I don't think this is normal.

DublinArnie · 07-02-2016 9:30pm

Love how the whole Leaving Cert community come together in the Mocks Thread

...

spurious · 08-02-2016 1:48pm

DublinArnie wrote: »

Love how the whole Leaving Cert community come together in the Mocks Thread ...

Oh that thread....

It also explains how so many people don't answer the question(s) asked in the Leaving, given how so many of them don't appear to be able to read the title of the thread and/or the first post.

This year's thread is particularly bad, although I appreciate it's not regular users like yourself Arnie that beggar it up. Newbies - how we love them.

legocrazy505 · 08-02-2016 7:43pm

spurious wrote: »

DublinArnie wrote: »

Love how the whole Leaving Cert community come together in the Mocks Thread ...

Oh that thread....

It also explains how so many people don't answer the question(s) asked in the Leaving, given how so many of them don't appear to be able to read the title of the thread and/or the first post.

This year's thread is particularly bad, although I appreciate it's not regular users like yourself Arnie that beggar it up. Newbies - how we love them.

Most people come onto the thread I suppose in a panic and are either too busy or too lazy to look through the thread. Though really if you knew you would end up checking the mocks thread you'd check it daily like most people have done. What's happened now is you end up with tons of people requesting exactly the same thing.

multimate · 08-02-2016 9:15pm

root(2) - 1 is a root of a function ax^2 + bx + c = 0 and you had to solve for a,b,c and find the other roots.
could someone help me with this please

multimate · 08-02-2016 9:15pm

root(2) - 1 is a root of a function ax^2 + bx + c = 0 and you had to solve for a,b,c and find the other roots.
could someone help me with this please

DublinArnie · 08-02-2016 9:40pm

multimate wrote: »

root(2) - 1 is a root of a function ax^2 + bx + c = 0 and you had to solve for a,b,c and find the other roots.
could someone help me with this please

You sub the root into the equation. (gets messy)

You should be getting b and c equalling something. In theory if something is a root to a function then it will cancel off. So therefore b and c will cancel off, you just sub in whatever for b and c to make the equation 0=0.

Are you sure a is in the question? I did the mock that had this question and don't recall seeing the a

.

You get the other roots by doing long division with the factor and then using the equation obtained in -B formula.

multimate · 08-02-2016 10:15pm

DublinArnie wrote: »

You sub the root into the equation. (gets messy)

You should be getting b and c equalling something. In theory if something is a root to a function then it will cancel off. So therefore b and c will cancel off, you just sub in whatever for b and c to make the equation 0=0.

Are you sure a is in the question? I did the mock that had this question and don't recall seeing the a .

You get the other roots by doing long division with the factor and then using the equation obtained in -B formula.

Thanks a million. So c turned out to be 0? Having no a makes it so much easier

emersyn · 09-02-2016 5:12pm

spurious wrote: »

Oh that thread....

It also explains how so many people don't answer the question(s) asked in the Leaving, given how so many of them don't appear to be able to read the title of the thread and/or the first post.

This year's thread is particularly bad, although I appreciate it's not regular users like yourself Arnie that beggar it up. Newbies - how we love them.

I've literally gotten about 50 messages since last Monday requesting that I send people entire exam papers, often for subjects I don't even do... They're not only ignoring the whole thread, they're also expecting random people to spend hours typing out comprehensive reports on each exam without even so much as a please or thank you instead of just typing a word into the search box to see the spoilers people have already put up :pac:

spurious · 09-02-2016 7:11pm

It's such a simple system if they would bother to follow it, but no, they'd rather bitch at mods and harass regular users.

swallace3454 · 14-02-2016 3:34pm

I'm currently doing 8 honour subjects and thinking of dropping to ordinary Irish if on the day I change my mind can I change to honours.

chocolate98 · 14-02-2016 6:26pm

is it bad that my mocks haven't even started yet?

malnurtured · 14-02-2016 6:53pm

chocolate98 wrote: »

is it bad that my mocks haven't even started yet?

I would've preferred if mine started as late as yours, to be honest. Our teachers were rushing the course to get as much done as possible because it started Feb 1st. I wouldn't worry about it.

DerekOK · 22-02-2016 9:55pm

Strange question but does anyone know if you can move from ordinary level up to higher level on the day of your leaving cert? I know you can do it the other way around but Im just wondering if this is ok too?

Consonata · 22-02-2016 10:09pm

DerekOK wrote: »

Strange question but does anyone know if you can move from ordinary level up to higher level on the day of your leaving cert? I know you can do it the other way around but Im just wondering if this is ok too?

You can take any paper you like on the day, It goes both ways. They literally call out who's taking HL/OL and you raise your hand I believe.

LC Off Topic Thread (2015/16)

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