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OCR PHYSICS B G491~ 19th May 2015 AM ~ AS Physics

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Reply 140

username1136031

Original post by jirapat121

i got 3.2D

I also got 3.2D..

Edit: Need to get -0.8 from -4 so +3.2D, think..

(edited 8 years ago)

Reply 141

LJflowrie

Original post by Alex Gerrow

The answer to the first question was negative (the sign was already on the paper)

I was 4.8 if you put u as negative and 3.2 if you put it as positive. I tried both and guessed 3.2 because both measurements were on the same side of the lens but i really don't know...

so it's 3.2 right?

Original post by LJflowrie

I was 4.8 if you put u as negative and 3.2 if you put it as positive. I tried both and guessed 3.2 because both measurements were on the same side of the lens but i really don't know...

I thought it was negative because when you worked it out in the question above, there was a negative sign on the answer already?

Reply 144

ben5312

what did anyone get for the 2, 3 markers on alloys

Reply 145

LJflowrie

Original post by SheLikeTheMango

I thought it was negative because when you worked it out in the question above, there was a negative sign on the answer already?

It probably was to be honest, hopefully i might get one method mark? I was rushing the first page because our invigilators hadn't given us formulae booklets before they started the exam so i didn't have one for the first 5 minutes which was really annoying...

Reply 146

IIEquinoxII

Original post by Alex Gerrow

I got 4.8, but don't think I did very well this year!

I got the same but looking back i think the answer was something negative

Reply 147

ZAK5YAK

Did everyone think it was reasonably hard then? Any ideas on grade boundaries?

Reply 148

Picton2727

I had 4.8 because the negative becomes positive on the other side. I put A for cable and D for crumple zone because it had a large plastic zone and a low youngs modulus, I thought the other plastic alloy would be to stiff.

Reply 149

jirapat121

Original post by MrPenguinPerson

Was that A for the first and D for the second? If so I think I got the same

don't you have to talk about the microstructure of the materials? about dislocations and sliip ?

Reply 150

Adem192

Original post by jirapat121

don't you have to talk about the microstructure of the materials? about dislocations and sliip ?

Yeah, i talked about how the alloy would pin the dislocations in place and things like that.

Reply 151

Picton2727

Original post by MrPenguinPerson

Was that A for the first and D for the second? If so I think I got the same

yeah it was

Reply 152

GabrielSmith1998

I did DAB for the materials. I panicked during the paper and did not properly talk about microstructure.

Reply 153

Picton2727

Original post by Adem192

Yeah, i talked about how the alloy would pin the dislocations in place and things like that.

Yeah it said also to state a reason why you picked it based on the graph and why the material acts this way from the microstructure

Reply 154

jirapat121

The question about the bird frequency was so weird, I don't understand what do they mean by aspects?!?

Reply 155

IAMADAM27

Loved that potato question, so glad it came up - it was about the only thing I actually revised!

Reply 156

LJflowrie

Original post by GabrielSmith1998

I did DAB for the materials. I panicked during the paper and did not properly talk about microstructure.

I didn't talk about microstructure either. I saw that it was 3 marks so i assumed 1 for the choice of alloy and 2 for explaining why (young's modulus, stress, stain, plastic region) so if microstructure is needed its probably only worth 1 mark for each (hopefully anyway)