*Leaving Cert Applied Maths Thread*

KevStar

Folks, could some kind soul PM me with the solutions to Murphy's 2nd edition? Thanks so much in advance.

And best of luck to everybody on Friday.

sdio

Can anyone help me understand why N = 0 in this statics question (2007)?

http://i.imgur.com/KyMGYvd.png

lostatsea

sdio wrote: »

Can anyone help me understand why N = 0 in this statics question (2007)?

http://i.imgur.com/KyMGYvd.png

When the object is on the verge of rolling onto the kerb, that is the point where it leaves the ground which means the reaction force between the object and the ground, N, is equal to zero.

sdio

lostatsea wrote: »

When the object is on the verge of rolling onto the kerb, that is the point where it leaves the ground which means the reaction force between the object and the ground, N, is equal to zero.

Thanks so much! I need to think more logically.

Benm123

Is covering just 6 questions too risky?

Our class in school has covered 7, hydrostatics included with the usual 6. But I never really studied hydrostatics that much, so should I spend these next few days just going over and nailing my 6 questions or should I try to cover hydrostatics too?

I have a decent knowledge of it and I'm pretty good at u tubes and immersed rods but the rest I hate.

AlfaJack

Benm123 wrote: »

Is covering just 6 questions too risky?

Our class in school has covered 7, hydrostatics included with the usual 6. But I never really studied hydrostatics that much, so should I spend these next few days just going over and nailing my 6 questions or should I try to cover hydrostatics too?

I have a decent knowledge of it and I'm pretty good at u tubes and immersed rods but the rest I hate.

I've only done 6 so hopefully it's not too risky By just have a basic knowledge of a 7th so if you really really can't do one then you can at least attempt hydrostatics

Chickenchild

I've left all my applied maths study until now, I know I'm an idiot but what's the best plan of action to maximise my grade on Friday? Got a C in the mock with little or no work but really need to do a little better than that in the real thing

OMGeary

D'ya reckon it will be a nice paper or a not so nice paper

The_N4sir

Hopefully a nice paper! Going in with q1,2,3,4,5,8,10 and I know q6 well enough to pick up some of the marks. I will probably leave out relative velocity out of the others since I find it very hit and miss.

No wedges please!

OMGeary

How do you solve sinx=2root3cos^2x

DarraghF197

OMGeary wrote: »

How do you solve sinx=2root3cos^2x

Cos*2x= 1-sin*2x.

Anyone else just completely lost motivation to study? Having three exams this week made me so tired and I have just hit a block in which I can't do any more! Nearly crossed the finish line!

ajguy97

DarraghF197 wrote: »

Cos*2x= 1-sin*2x.

Anyone else just completely lost motivation to study? Having three exams this week made me so tired and I have just hit a block in which I can't do any more! Nearly crossed the finish line!

You're not alone lol ha :P

Luke Armstrong

Any one have any differential equation questions? as most years prior to 2012 use differential by substitution

MmmPancakes

Luke Armstrong wrote: »

Any one have any differential equation questions? as most years prior to 2012 use differential by substitution

2014
2013
2012
2011 10 (a)
2007 10 (a)
2005 10 (a) and (b)
2004 10 (a)
2002 10 (a)
2001 10 (a) and (b)
2000 10 (a) and (b)
1998 10 (a) and (b)
1997 10 (a) and (b)
1996 10 (a)

Luke Armstrong

MmmPancakes wrote: »

2014
2013
2012
2011 10 (a)
2007 10 (a)
2005 10 (a) and (b)
2004 10 (a)
2002 10 (a)
2001 10 (a) and (b)
2000 10 (a) and (b)
1998 10 (a) and (b)
1997 10 (a) and (b)
1996 10 (a)

cheers

Benm123

What type of paper are people expecting?
I read a few articles about how hard the last two years papers have been, apparently some new guy who wants to make the subject 'more challenging' has been setting the papers since then.

Do you reckon they'll ease up on us this year after the small outrage of the last two years papers or will they give us another hard paper again?

MmmPancakes

I hope so because I am still not able to do part b of most questions

oh well i'm not going to count it anyways

olafalade

Hi guys,

Does anyone know where the formula for Q10 (b)(i) in 2010 derives from?
I know there are certain formulas to learn but I can't find this one.

(I can't post a link to the marking scheme )

sdio

olafalade wrote: »

Hi guys,

Does anyone know where the formula for Q10 (b)(i) in 2010 derives from?
I know there are certain formulas to learn but I can't find this one.

(I can't post a link to the marking scheme )

It's substitution (which we don't need to know). Someone posted a list of questions without substitution on the top of this page.

Hon the Dubs

olafalade wrote: »

I know there are certain formulas to learn but I can't find this one.

can anyone tell me what these formula's that we have to learn are?

Kremin

Hon the Dubs wrote: »

can anyone tell me what these formula's that we have to learn are?

We have to learn formulas? As far as I know theyre all in the book..

Broseph

What are the inertia formulas we need to know? Aside from the Moments of inertia formulas for each shape in the log tables

Hon the Dubs

Kremin wrote: »

We have to learn formulas? As far as I know theyre all in the book..

Ye that's what I thought!
That guy got me worried saying we had formulas to learn off, pretty sure we don't

AlfaJack

Do we not need to know substitution anymore? :O I'm so happy if so because although I can do it, it's a bit confusing haha

OMGeary

AlfaJack wrote: »

Do we not need to know substitution anymore? :O I'm so happy if so because although I can do it, it's a bit confusing haha

No substitution

Yokes

Formulas you need to learn off that aren't in the tables really only apply to simple harmonic motion
F=k(l-lo)=kx
Average speed = 4A/T
a max = w^2 A
V max = w A

Anyone else think circular disc shouldn't come up this year for q8? Been up 3 years in a row

dalta5billion

dv/dt = v* dv/ds

Yokes

dalta5billion wrote: »

dv/dt = v* dv/ds

dv/dt = ds/dt x dv/ds (chain rule)
= v dv/ds

dalta5billion

Yokes wrote: »

dv/dt = ds/dt x dv/ds (chain rule)
= v dv/ds

Helpful to learn off to be used quickly

OMGeary

dalta5billion wrote: »

Helpful to learn off to be used quickly

can you use v dv/ds straight away or do you have to show how you got it