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The Physics PHYA2 thread! 5th June 2013

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I got 1.07J i believe,

I rounded it up to 2.s.f, although I did the area of a trapezoid + the area of the triangle to get it, but I'm sure they'd accept 2.s.f as well.

Reply 1541

DaveMarsden95

I was so happy that moments didn't come up i would've lost all of those marks

Reply 1542

Tuya

So the intensity of red light is lower right?
And I read the volume of the sphere formula wrong (yes I know) and I thought it was r2 instead of r3. I'm only going to lose a mark for that right?

Posted from the TSR iPad app

Reply 1543

1144876

Original post by DthNte

It was 1.0J as it was to 1 significant figure :smile:

But hopefully they'll accept anything around that.

They don't care about sig fig except in the question where it says appropriate sig fig. (For some reason, that question I decided to give the answer unrounded, but all the others did it to the 2 sig fig in the question :/ )

Reply 1544

Max28

Did anyone else get 9.2m.s-2 for the acceleration of the glider?

Reply 1545

FLLF

Original post by nich01as

Yes yes and yes :biggrin:

fantastisch :biggrin:

Reply 1546

Raimonduo

Stalkers lecture on the total internal reflection conditions seemed to have proved to be helpful.

Reply 1547

spangie

Original post by Tuya

I did exactly the same with the sphere, kicking myself!

Reply 1548

FLLF

Original post by Max28

Did anyone else get 9.2m.s-2 for the acceleration of the glider?

Definitely, I think a few will make mistakes on this for not converting to mass

Reply 1549

Raimonduo

Original post by Max28

Did anyone else get 9.2m.s-2 for the acceleration of the glider?

Yeah I got that as well, I thought calculated it incorrectly, phew.

Reply 1550

IWantSomeMushu

I only realised the pythagoras part of q1 near the end and got it in with like 20 seconds to spare lol. I used to 6100N value on 1c so would I be penalised for that?

Reply 1551

1144876

Btw, any thoughts on the 100% ums mark? The mean of previous years in 60, with 57 being the lowest, 69 being the highest, and 62 being the second highest. Any thoughts? Harder than normal, easier? Thanks.

Reply 1552

FLLF

Original post by IWantSomeMushu

I only realised the pythagoras part of q1 near the end and got it in with like 20 seconds to spare lol. I used to 6100N value on 1c so would I be penalised for that?

Yeah, they normally give 2 answers on the mark scheme, one of them is when you use the rounded value.

Reply 1553

1144876

Original post by IWantSomeMushu

I only realised the pythagoras part of q1 near the end and got it in with like 20 seconds to spare lol. I used to 6100N value on 1c so would I be penalised for that?

You shouldn't be, questions where you could get different answers depending on whether you use rounded/unrounded answers are generally given a range of correct answers.

Reply 1554

GeorgeBarrett1

Original post by nich01as

Around 60-61 because there was many places where many people would get caught out

Posted from TSR Mobile

Reply 1555

Zakee

Original post by DthNte

It was 1.0J as it was to 1 significant figure :smile:

But hopefully they'll accept anything around that.

I got 1.1J, do you think they'll allow that? My answer was 1.075J.

Reply 1556

h94k

Used area of sphere accidentally instead of volume when calculating weight. How many marks will i lose? I wrote out formula so examiner can see where i went wrong.

Reply 1557

FLLF

Original post by Zakee

I got 1.1J, do you think they'll allow that? My answer was 1.075J.

I got the same answer, there will be a range of accepted values, and 1.1 will be in there

Reply 1558

Claree

Original post by nich01as

Which paper was it 69 for???! I would think around 60 maybe for this paper.

Reply 1559

Sayonara

What did people draw for the red light thing?

I had the maximum intensities the same but the fringes wider. I measured it so that all the other fringes were half the size of the central maximum.

I hope I'm right.