You are Here: Home >< Physics

# The Physics PHYA2 thread! 5th June 2013 Watch

• View Poll Results: What mark do you think you got out of 70?
0-20
6
3.00%
21-40
12
6.00%
41-50
29
14.50%
51-60
79
39.50%
61-70
74
37.00%

1. (Original post by Davelittle)
I got 1.05J
i got 1.06J
2. (Original post by Davelittle)
What are you doing at Cambridge?
Guess?

Posted from TSR Mobile
3. (Original post by jonny7bell)
They get something like 15 applications per place, it is actually very hard to get into it.
Exaggeration? :P Natural Sciences (Which I'm applying for) has 4 per place.
4. 6100N
9.5degrees
Acceleration
Ep
Power efficiency 20.4

Question2:
0.55s
245m ish as square route of 2y/g
S=Vt so if V is lower S is lower acceleration is equal for both across same distance therefore same vertical downwards time however lower horizontal velocity in b means lower distance as S=Vt

Question3:
volume of sphere equation density over volume value is 0.44n weight
The ball in oil including newtons first and second law terminal velocity resultant forces and gravity vs drag to create curve of velocity followed by horizontal etc(6 marks)
Then graph- straight line until it goes in then curve to decreasing gradient until gradient=0 and stays constant

Question4:
Hookes law
Gradient for k (1100 N/m ish
Area under- 1/2F x delta l can't remember value
Straight line parallel to first one intersecting x axis
plasticity definition (look it up)
Work is less as area under graph is less energy absorbed as heat and in permanent extension

Question5:

Two conditions for TIR? Higher than critical angle, and moving from a higher n to lower n.

Speed of light = 1.7*10^8

Angle =30 degrees

Critical angle = 51 degrees

What happens to the ray of light? Undergoes TIR since angle of incidence = 52 degrees > critical angle

Draw light reflecting off thanks to flf

Question6: Progressive wave one
1/2pi and 3/2 pi
Describe motion of B (up then down then down then up)
Transverse so seismic Secondary wave oscillations perpendicular to energy transfer, many oscillation planes turned to one therefore must transverse
Define frequency
Wavelength c=wavelength x frequency therefore answer forgotten values

Question7:
Definition of monochromatic
Fringes larger intensity equal
Forgot
White light fringes vs monochromatic fringes red outside fringes blue light inside white central colours diffract at different angles therefore overlapping etC (This was white light from a single slit!)
5. (Original post by jonny7bell)
They get something like 15 applications per place, it is actually very hard to get into it.
Things change when you sleep with admissions tutor

Posted from TSR Mobile
6. (Original post by nich01as)
Exaggeration? :P Natural Sciences (Which I'm applying for) has 4 per place.
NatSci is 8 per place.... More at the better colleges for science
7. (Original post by OliverG)
For question 2 (or 3, can't remember) with the efficiency, if I did the right method but got part a) wrong, thus getting part b) and c) wrong, would I only lose marks for the first part?
They'll deduct a mark from every question the paper for being a fool leaving you with no higher than a D.

Posted from TSR Mobile
8. I would thumbs you down but I've reached my limit for today.

(Original post by february-girl)
Not sure what everyone's talking about because that was the easiest paper I've ever done. Probs lost 1 mark and that's being harsh on myself. Only need a C for an A* anyway. Cambridge here I come!!!! Who's joining me?

Posted from TSR Mobile
9. (Original post by Felix Ivers)
Thats true. What would be great is a 6 marker stating and explaining newtons laws (1 mark for stating 1 for explaining each). They've shown that they'll put any topic in the 6 markers like in unit 1, so you never know!

Posted from TSR Mobile
Just to say, basically predicted the 6 marker, psychic over here.

Posted from TSR Mobile
10. (Original post by IWantSomeMushu)
I'm wondering why the boundaries are so low for this unit. Surely most people doing Physics will also be doing Maths with mechanics?
Yeah, but at my school we do S1 instead of M1.
11. (Original post by february-girl)
Guess?

Posted from TSR Mobile
PHYSICS?
12. (Original post by Davelittle)
PHYSICS?
Cambridge don't have a course for just physics
13. (Original post by Goods)
NatSci is 8 per place.... More at the better colleges for science
On the website it says 4 applications per place
14. Guys how did you find the exam?

I've created a poll, hopefully it might give an idea of the grade boundaries?
15. (Original post by .raiden.)
Cambridge don't have a course for just physics
NatSci then picky
16. (Original post by waheed786)
I would thumbs you down but I've reached my limit for today.
Don't cry because I've increased the grade boundaries for you fella. Should have got your head down and revised :-)

Posted from TSR Mobile
17. what was the wavelength question for which the answer was 750m ?? does anyone remember? thanks!
18. Ohh trust me you haven't it just seems like you're being a bit full of yourself, you sound like one of them posh school kids , whom I hate so very much. And I've been putting my head down hope full marks is round 60.

(Original post by february-girl)
Don't cry because I've increased the grade boundaries for you fella. Should have got your head down and revised :-)

Posted from TSR Mobile
19. You know for calculations I think I might of forgot to put one answer in the space provided will you still get the marks as you got the correct answer but not on the line?

Also I got the work done by finding the number of squares and times by the area per square?
20. (Original post by waheed786)
what was the wavelength question for which the answer was 750m ?? does anyone remember? thanks!
Frequency was 6.0 HZ

Speed was 4.5x10^3

lambda=c/f=4.5x10^3/6.0=750m

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: September 15, 2013
Today on TSR

### What is the latest you've left an assignment

And actually passed?

### Simply having a wonderful Christmas time...

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources

Can you help? Study help unanswered threadsStudy Help rules and posting guidelinesLaTex guide for writing equations on TSR

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.