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# AQA Physics PHYA4 - Thursday 11th June 2015 [Exam Discussion Thread] watch

1. (Original post by thedon96)
Hey I think the hardest part of the question is getting round the kWh thing but that's just a unit of Energy (E = Pt). If you convert this unit to make it Kilowatt-seconds, you can just use your previous answer to work out the cost.

Hope this helps.
Totally does just worked it out cheers!

Just divide by 60 twice. THanks!"
2. (Original post by Lau14)
Thanks! (I think this is legitimately the worst cold I've ever had though why). At least core 4 boundaries are usually really low, and you did so well on core 3 it'll probably balance out alright
Thanks for the reassurance. Core 3 was brilliant but Core 4

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3. (Original post by NEWT0N)
But why does it happen when mv^2/r=mg? >:O
(first post here: http://www.thestudentroom.co.uk/show...47347&page=160 )
When an object is weightless it's reaction force equals zero, leaving its weight equal to the centripetal force

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4. Any suggestions on possible six markee this year?
5. (Original post by CD223)
When an object is weightless it's reaction force equals zero, leaving its weight equal to the centripetal force

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Lifesaver, thanks so much! (EDIT: I owe you a +rep tomorrow, it says that my rep limit is reached for today)
6. (Original post by Kennethm)
I cannot fxcking believe im asking this - how on earth do you do Q3
http://filestore.aqa.org.uk/subjects...1-QP-JUN14.PDF
mass= 1000 x 2x10^-4=0.2
v= 2x10-4/7.2x10^-4 = 5/18

mv = 0.2 x 5/18 =>> 5.55... x10^-2 => 5.6x10^-2 so B.
7. (Original post by NEWT0N)
Lifesaver, thanks so much! (EDIT: I owe you a +rep tomorrow, rep limit reached for today)
Lol, I saved Newton? Have I won PHYA4? 😂

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8. (Original post by CD223)
Thanks for the reassurance. Core 3 was brilliant but Core 4

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I don't know if you're aware or not but the unofficial mark scheme for Edexcel board is always uploaded a few hours after the exam by Arsey but it seems that he's hasn't finished the paper yet.

Edit: just realised you're not on edexcel exam board otherwise you would have your exam on the same day as me

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9. (Original post by cd223)
lol, i saved newton? Have i won phya4? 😂

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LOL YES

instant win
10. (Original post by Mehrdad jafari)
I don't know if you're aware or not but the unofficial mark scheme for Edexcel board is always uploaded a few hours after the exam by Arsey but it seems that he's hasn't finished the paper yet.

Edit: just realised you're not on edexcel exam board otherwise you would have your exam on the same day as me

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Ah I do AQA I made the unofficial mark scheme for the Core 3 and Core 4 exams. Core 3 went well as I got most the answers but core 4 was disastrous so I didn't get all of the answers I wrote in the mark scheme a had to rely on others

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11. (Original post by CD223)
Ah I do AQA I made the unofficial mark scheme for the Core 3 and Core 4 exams. Core 3 went well as I got most the answers but core 4 was disastrous so I didn't get all of the answers I wrote in the mark scheme a had to rely on others

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Did m2 today

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12. Does someone mind explaining this? The answer is C but i have no idea why

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13. (Original post by CD223)
Ah I do AQA I made the unofficial mark scheme for the Core 3 and Core 4 exams. Core 3 went well as I got most the answers but core 4 was disastrous so I didn't get all of the answers I wrote in the mark scheme a had to rely on others

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It's alright man. It's not healthy having emotions for it now. Have an orange juice or something and be relax, serious

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14. (Original post by Mehrdad jafari)
It's alright man. It's not healthy having emotions for it now. Have an orange juice or something and be relax, serious

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Appreciate the words! Gonna channel the anger into PHYA4 revision!

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15. (Original post by Klaxoii)

Does someone mind explaining this? The answer is C but i have no idea why

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Well it cannot be A because gravity is always attractive( at least to what we know)

Cannot be B because if the gravitational field at the surface of the earth was zero we would be floating. Or the fact the earth has mass cannot have a zero field strength at its surface

It's C and The proof of that is in the book

It's not D because potential is work done per unit mass so it must be J/kg
• once you are confident that you know which one is correct leave the rest but have a glance at them

Edit: typing error

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16. You probably know this but i share it anyway.

http://www.schoolphysics.co.uk/age16...ent/index.html

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17. (Original post by CD223)
Appreciate the words! Gonna channel the anger into PHYA4 revision!

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It's cool man

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18. (Original post by a.a.k)
You probably know this but i share it anyway.

http://www.schoolphysics.co.uk/age16...ent/index.html

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Great link! Thanks.

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19. (Original post by Mehrdad jafari)
Well it cannot be A because gravity is always attractive( at least to what we know)

Cannot be B because if the gravitational field at the surface of the earth was zero we would be floating. Or the fact the earth has mass cannot have a zero field strength at its surface

It's C and The proof of that is in the book

It's not D because potential is work done per unit mass so it must be J/kg
• once you are confident that you know which one is correct leave the rest but have a glance at them

Edit: typing error

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That makes sense, I originally thought it was D, but looking at the data sheet it's easy to see! Thanks for reply

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20. (Original post by Klaxoii)
That makes sense, I originally thought it was D, but looking at the data sheet it's easy to see! Thanks for reply

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It's ok, I'm happy you've understood it

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