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

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Don't understand this 😂😭😭😭😭😭😂

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Reply 3141

thedon96

Original post by Adangu

Can someone help me with 4b) iv) on jan 2010 phya4/2 please?
http://www.aqa.org.uk/subjects/science/as-and-a-level/physics-a-2450/past-papers-and-mark-schemes

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.

Reply 3142

lebanon95

Whip out the coffee lads!! We've got 36 hours to jamjamjam

P.S it sound like I'm a lost soul but I've been through PHY4 thoroughly about 5 days ago but had other exams up until now :smile:

#TeamPreparedToNotBePrepared

Reply 3143

thedon96

Original post by gcsestuff

Don't understand this 😂😭😭😭😭😭😂

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I don't think you're looking at the right part of the markscheme for that question :wink:

Reply 3144

Adangu

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!"

Reply 3145

OP

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 :smile:

Thanks for the reassurance. Core 3 was brilliant but Core 4 :frown:

Reply 3146

OP

Original post by NEWT0N

But why does it happen when mv^2/r=mg? >:O
(first post here: http://www.thestudentroom.co.uk/showthread.php?t=3047347&page=160 )

When an object is weightless it's reaction force equals zero, leaving its weight equal to the centripetal force :smile:

Reply 3147

Aysan

3

Any suggestions on possible six markee this year?

Reply 3148

Whateverisbest

Original post by Kennethm

I cannot fxcking believe im asking this - how on earth do you do Q3
http://filestore.aqa.org.uk/subjects/AQA-PHYA41-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.

Reply 3149

OP

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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Reply 3150

Absent Agent

21

Original post by CD223

Thanks for the reassurance. Core 3 was brilliant but Core 4 :frown:

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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(edited 8 years ago)

Reply 3151

OP

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 :frown:

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 :frown:

Reply 3152

a.a.k

Original post by CD223

Ah I do AQA :frown:

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 :frown:

Did m2 today

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Reply 3153

Klaxoii

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

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Reply 3154

Absent Agent

21

Original post by CD223

Ah I do AQA :frown:

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 :frown:

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

Reply 3155

OP

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 :smile:

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

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Reply 3156

Absent Agent

21

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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(edited 8 years ago)

Reply 3157

a.a.k