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# OCR PHYSICS B G492~ 9rd June 2014~ AS Physics Watch

1. (Original post by Carla Huynh)

Over the 3cm part there are 4x so x=3/4cm

nice one mate cheers I should really get some sleep...
2. (Original post by Carla Huynh)
Oh I see where you got that from. The bold lines are just the lines that are always on oscilloscopes for some unknown reason. It's the small squares that are each a division, so I guess really you're right- the resolution is one of those squares so 1 division.
I was thinking of the uncertainty being 0.1 because that's the thickness of the line!!! Sorry my bad
Sorry I'm so confused! What is the resolution then??:/

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3. (Original post by emfp21)
Sorry I'm so confused! What is the resolution then??:/

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Resolution is 1 division because that's how far apart the lines are to take readings from.

the uncertainty is 0.1 divisions because that's how thick the line is
4. (Original post by Carla Huynh)
Resolution is 1 division because that's how far apart the lines are to take readings from.

the uncertainty is 0.1 divisions because that's how thick the line is
Thanks, how do you know the line is that thick though?? We weren't told

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5. Good luck everyone!
6. (Original post by emfp21)
Thanks, how do you know the line is that thick though?? We weren't told

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Just saw you said the resolution was 0.1 divisions earlier, what is it ??:/

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7. (Original post by emfp21)
Thanks, how do you know the line is that thick though?? We weren't told

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Just looks about a tenth of a division. Should probably measure it with a ruler in the exam
8. (Original post by emfp21)
Just saw you said the resolution was 0.1 divisions earlier, what is it ??:/

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Yeah sorry I got mixed up. I think the resolution is 1 div and the uncertainty is 0.1.
9. (Original post by Carla Huynh)
Yeah sorry I got mixed up. I think the resolution is 1 div and the uncertainty is 0.1.
Okay thanks for your help. Good luck today

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10. (Original post by Mutleybm1996)
Attachment 289334

For 3 why does the mark scheme use 120x10-6?

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because they are changing it into kilograms rather than grams
11. How was it!
12. It was okay I thought
13. I found that really a good exam.

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14. It was a pretty good paper in comparison to a mess of a G491 paper
15. Good paper
16. Very fair paper. A = 72-78 I would say.
17. That little error at the start...

Oh OCR you so silly.
18. What did people put for section c :

"Estimate mean power whilst accelerating from 0-27?"

I put 27kW

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19. Don't judge, I did P=Fv, v being (27+0)/2, F being 2000N
20. (Original post by Vithu09)
Don't judge, I did P=Fv, v being (27+0)/2, F being 2000N
Same, it's just average velocity times force. Although I think I may have used the exact value farther than the rounded value.

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