Year 12s: what will be the first way you research your future options? >>

AQA AS Physics A Unit 2 25/05/12 - PHYA2

Scroll to see replies

Reply 20

silentlife

Any suggestions on waves? Do we need to know about waves in columns of air?

Reply 21

kingm

Original post by silentlife

Any suggestions on waves? Do we need to know about waves in columns of air?

I've extensively gone through the Nelson Thornes As book and haven't seen the word 'column' written anywhere so I think, and hope, the answer to that is no.

Reply 22

kingm

Any of you guys and girls been given any clues by your teachers as to what the practical task might be by any chance? I've started another thread on it but more people look at this one so was hoping to get some answers here instead. Cheers.

Reply 23

JenniS

Does anyone know how to derive the formula for energy stored=1/2F deltaL ??? please explain! x

Reply 24

silentlife

Original post by JenniS

Does anyone know how to derive the formula for energy stored=1/2F deltaL ??? please explain! x

Area under graph of force vs delta extension graph (area of triangle because gradient is constant (stiffness constant)) is the work done/energy needed to extend spring.

Hope that helps.

(edited 11 years ago)

Reply 25

JenniS

Original post by silentlife

Area under graph of force vs delta extension graph (area of triangle because gradient is constant (stiffness constant)) is the work done/energy needed to extend spring.

Hope that helps.

ahh that makes sense, thanks. I knew it wasn't difficult, just couldn't remember how to derive it!

Reply 26

Ganep001

Original post by silentlife

I've been searching around and there seem to be no discussion on this. So here goes...

Just to start off, here is the Jan 12 paper. Good luck everyone :smile:

Hi there. I was wondering if you had the mark scheme for this paper

Reply 27

username890104

Original post by Ganep001

Hi there. I was wondering if you had the mark scheme for this paper

I've got it, but I'm not allowed to post in on TSR as it is a breach of the rules. If you PM me with your e-mail, then I'll send it to you.

Reply 28

louisjevans

Original post by Ganep001

Hi there. I was wondering if you had the mark scheme for this paper

http://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CGAQFjAB&url=http%3A%2F%2Fwww.thestudentroom.co.uk%2Fattachment.php%3Fattachmentid%3D142363%26d%3D1334601720&ei=5p2mT-bfJYnZ8AOM0OnbBA&usg=AFQjCNGExrJdrNRi8bFacki-K8ilCZQArA

There you go lad

(edited 11 years ago)

Reply 29

silentlife

Any suggestions on the next 2 dreaded 6-8 marker silly descriptions?

Reply 30

Ganep001

Original post by louisjevans

Cheers mate :biggrin:

Reply 31

louisjevans

Original post by silentlife

Any suggestions on the next 2 dreaded 6-8 marker silly descriptions?

the last 3 papers have been about waves so im guessing it'll be about youngs modulus

Reply 32

Mystic Creature

Can someone please explain polarisation to me because I don't understand it, oh and stationary waves...what the **** are they? :frown:

Reply 33

aerf

Hoping/praying for a nice paper

Reply 34

aerf

Original post by Mystic Creature

Can someone please explain polarisation to me because I don't understand it, oh and stationary waves...what the **** are they? :frown:

Damn I just wrote a load to you on this and then stupidly clicked off it...

Reply 35

cooldudeman

how do you calculate the energy wasted?

Reply 36

aerf

Original post by cooldudeman

how do you calculate the energy wasted?

Hmmmmm, probably just by working out the work done. What is the question?

Reply 37

Mystic Creature

Original post by aerf

Damn I just wrote a load to you on this and then stupidly clicked off it...

Aahh them ones :nooo:

I think I understand them.

Polarisation is all about whether the wave is travelling in one plane - if it is, then it is polarised, whereas if the vibrations change planes, the waves are unpolarised. And theres that polaroid experiment where unpolarised waves hit a polaroid filter, and only waves parallel to the way the atoms are arranged get through, and so the light gets polarised (right? please correct me if im wrong), and then when another polaroid filter, turned 90 degrees, is placed further down, no waves get through as they are all stopped by the atoms. Is that it? Anything else I need to know about?

And stationary waves, I finally understand what the **** they actually are! :biggrin: