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

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    (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!"
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    (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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    (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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    Any suggestions on possible six markee this year?
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    (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)
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    (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.
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    (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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    (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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    (Original post by cd223)
    lol, i saved newton? Have i won phya4? 😂


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    LOL YES

    instant win
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    (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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    (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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    Name:  ImageUploadedByStudent Room1433881188.621029.jpg
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    Does someone mind explaining this? The answer is C but i have no idea why


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    (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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    (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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    (Original post by Klaxoii)
    Name:  ImageUploadedByStudent Room1433881188.621029.jpg
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    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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    You probably know this but i share it anyway.

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

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    (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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    (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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    (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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    (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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