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

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    (Original post by CD223)
    Nope lol, unfortunately not. When people ask questions on the thread I just quickly grab a pen and paper and post my workings sorry!


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    Oh wow thanks dude i didn't know you did that! You seem really confident for the exam
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    (Original post by CD223)
    I swear that's illegal.

    (It's not, but you know what I mean )

    I think the stress/strain topic is worth revising along with waves from last year as they seem to come up in SHM questions in the past.


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    Stationary waves too 0.0 because stationary waves are resonance. Sh*t

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    (Original post by SuperMushroom)
    Oh wow thanks dude i didn't know you did that! You seem really confident for the exam
    No problem! Helps me go over questions as well - I like it

    I'm definitely not confident though never confident with exams. I always get nervous and make mistakes


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    (Original post by _Caz_)
    Stationary waves too 0.0 because stationary waves are resonance. Sh*t

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    Yeah stationary waves and fundamental nodes came up in a previous paper which worried me. I know it was only a couple of marks but it hit home how much I've forgotten from AS.


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    (Original post by CD223)
    Yeah stationary waves and fundamental nodes came up in a previous paper which worried me. I know it was only a couple of marks but it hit home how much I've forgotten from AS.


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    Lambda/2 is the length of the wire/string right? I think I saw that somewhere on a question...

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    (Original post by CD223)
    No problem! Helps me go over questions as well - I like it

    I'm definitely not confident though never confident with exams. I always get nervous and make mistakes


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    I'm sure you'll be ok! If you have a moment could you explain question 12 on that same paper please
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    (Original post by _Caz_)
    Lambda/2 is the length of the wire/string right? I think I saw that somewhere on a question...

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    For a fundamental node, \frac{\lambda}{2} = l where l is the length of the string.

    For the second overtone/first harmonic, the length of the string equals lambda.

    It goes like this:

    Name:  ImageUploadedByStudent Room1433443400.675402.jpg
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    (Original post by CD223)
    For a fundamental node, \frac{\lambda}{2} = l where l is the length of the string.

    For the second overtone/first harmonic, the length of the string equals lambda.

    It goes like this:

    Name:  ImageUploadedByStudent Room1433443400.675402.jpg
Views: 68
Size:  63.8 KB


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    Ah okay. The next would be 3/2 lambda then? (For the third overtone)

    Thank you so much for clearing that up

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    (Original post by SuperMushroom)
    I'm sure you'll be ok! If you have a moment could you explain question 12 on that same paper please
    Name:  ImageUploadedByStudent Room1433443719.295452.jpg
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    (Original post by _Caz_)
    Ah okay. The next would be 3/2 lambda then? (For the third overtone)

    Thank you so much for clearing that up

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    Yeah it goes up in intervals of lambda/2


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    Thats question 13 mate, the one i dont understand is 12
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    (Original post by SuperMushroom)
    Thats question 13 mate, the one i dont understand is 12
    Lol, going absolutely mad.

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    (Original post by CD223)
    Lol, going absolutely mad.

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    Could you explain what you have done on the 3rd line down please?
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    (Original post by SuperMushroom)
    Could you explain what you have done on the 3rd line down please?
    • The ratios of gravitational field strength equals the ratio of the masses divided by the ratio of the radii squared.

    • the mass is proportional to the product of the density times volume, and hence proportional to the density times radius cubed:

    • The ratios of gravitational field strength equals the ratio of the densities multiplied by the ratio of the radii cubed divided by the ratio of the radii squared.

    Cancelling top and bottom (cubed and squared terms):
    • The ratios of gravitational field strength equals the ratio of the densities multiplied by the ratio of the radii.

    • Dividing the ratios of gravitational field strength by the ratio of the densities gives 6 divided by 5/3 which is 3.6.


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    Are we allowed to use Extra paper for multiple choice?
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    http://filestore.aqa.org.uk/subjects...W-QP-JAN11.PDF

    could anyone explain question 3a its straight over my head

    EDIT- not as bad as it looks when looking at the mark scheme, i was just over complicating it thinking about the resistor and capacitor discharge!!
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    any predictions for this paper?
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    (Original post by theoriginalrpr)
    any predictions for this paper?
    Lots of physics

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    Can anyone explain why racing tracks are bunked in terms of centripetal force.
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    (Original post by sykik)
    Are we allowed to use Extra paper for multiple choice?
    I can't see why not, but as the answers for the multiple choice go onto a separate sheet you can write all over and around the questions for that section
 
 
 
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