Join TSR now and get all your revision questions answeredSign up now

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

    Offline

    0
    ReputationRep:
    Hey guys, anyone doing UNIT6 ISA? And if so any idea what it's on?? I'm a external student resitting mine so I have MINIMUM idea what it is on

    Posted from TSR Mobile
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by susanjan123)
    Hey guys, anyone doing UNIT6 ISA? And if so any idea what it's on?? I'm a external student resitting mine so I have MINIMUM idea what it is on

    Posted from TSR Mobile
    Same question but for the EMPA hahha.


    Posted from TSR Mobile
    Offline

    3
    ReputationRep:
    (Original post by susanjan123)
    Hey guys, anyone doing UNIT6 ISA? And if so any idea what it's on?? I'm a external student resitting mine so I have MINIMUM idea what it is on

    Posted from TSR Mobile
    I'm doing my first practical on 26th Feb, but dunno what's it on. What date r u doin it on?
    Offline

    0
    ReputationRep:
    I haven't been told a date yet, mine is on capacitors :|

    Posted from TSR Mobile
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by susanjan123)
    I haven't been told a date yet, mine is on capacitors :|

    Posted from TSR Mobile
    I had a mock EMPA on that the other week aha.


    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    Attached Images
     
    Offline

    3
    ReputationRep:
    (Original post by KeithHayward)
    Jeez. I'm going to go with D.
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by KeithHayward)
    Isn't it A?


    Posted from TSR Mobile
    Offline

    3
    ReputationRep:
    (Original post by CD223)
    Isn't it A?


    Posted from TSR Mobile
    What's your reasoning?
    Offline

    2
    ReputationRep:
    (Original post by JaySP)
    Jeez. I'm going to go with D.
    (Original post by CD223)
    Isn't it A?


    Posted from TSR Mobile
    The answer is B (june 2009). What's the reasoning behind both of your answers? Im stumped?
    Offline

    3
    ReputationRep:
    (Original post by KeithHayward)
    The answer is B (june 2009). What's the reasoning behind both of your answers? Im stumped?
    My reasoning:
    If l, length, is smaller, the time period T will as a result be smaller. If T is smaller, the acceleration will be larger. Since acceleration is proportional to displacement from equilibrium, if acceleration is larger, the amplitude will be larger.

    Are you sure its June 09? just tried to find the examiners report but no Unit 4 paper was released that cycle?
    Offline

    2
    ReputationRep:
    (Original post by JaySP)
    My reasoning:
    If l, length, is smaller, the time period T will as a result be smaller. If T is smaller, the acceleration will be larger. Since acceleration is proportional to displacement from equilibrium, if acceleration is larger, the amplitude will be larger.

    Are you sure its June 09? just tried to find the examiners report but no Unit 4 paper was released that cycle?
    I'm sure (https://www.school-portal.co.uk/Grou...urceId=2727216). That was my reasoning too. If you know how to, do you mind @ing 'stonebridge'?
    Offline

    3
    ReputationRep:
    (Original post by KeithHayward)
    I'm sure (https://www.school-portal.co.uk/Grou...urceId=2727216). That was my reasoning too. If you know how to, do you mind @ing 'stonebridge'?
    Can't find the examiner's report anywhere.:confused::confused: and I don't know how to @ someone on TSR, sorry :confused::confused::confused:
    Offline

    1
    ReputationRep:
    Is it to do with resonance and the natural frequency being similar?


    Posted from TSR Mobile
    Offline

    3
    ReputationRep:
    (Original post by dannywaughman)
    Is it to do with resonance and the natural frequency being similar?


    Posted from TSR Mobile
    Doons
    Offline

    2
    ReputationRep:
    (Original post by dannywaughman)
    Is it to do with resonance and the natural frequency being similar?


    Posted from TSR Mobile
    (Original post by JaySP)
    Doons
    Is this right? If so how do you know that the nat freqs are similar?
    Offline

    3
    ReputationRep:
    (Original post by KeithHayward)
    Is this right? If so how do you know that the nat freqs are similar?
    I think Danny and I concluded:
    Something about the length of strings being related to the frequency of oscillation
    Something about the frequency of P being the Natural Frequency
    Something about the closer the string length to P, the more vigorous the oscillations of the other mass (ie resonance).

    It does make a little sense. if two lengths of a string are the same, they are going to have the same time period, and thus similiar amplitudes. (Or I'm just BS'ing).
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by KeithHayward)
    The answer is B (june 2009). What's the reasoning behind both of your answers? Im stumped?
    I don't know tbh. I thought as it was longest it had the largest amplitude, but then I realised I got mixed up between the relationship between length and amplitude and length and time period aha. Sorry.


    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    (Original post by dannywaughman)
    Is it to do with resonance and the natural frequency being similar?


    Posted from TSR Mobile
    (Original post by JaySP)
    I think Danny and I concluded:
    Something about the length of strings being related to the frequency of oscillation
    Something about the frequency of P being the Natural Frequency
    Something about the closer the string length to P, the more vigorous the oscillations of the other mass (ie resonance).

    It does make a little sense. if two lengths of a string are the same, they are going to have the same time period, and thus similiar amplitudes. (Or I'm just BS'ing).
    (Original post by CD223)
    I don't know tbh. I thought as it was longest it had the largest amplitude, but then I realised I got mixed up between the relationship between length and amplitude and length and time period aha. Sorry.


    Posted from TSR Mobile
    It makes quite a bit of sense, but I don't know if we're missing something. To save us teaching ourselves the wrong thing i'll ask my teacher tomorrow and see what he says...

    CD223 I did the same earlier

    Will keep you all updated if nothing else emerges in the meantime
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by KeithHayward)
    It makes quite a bit of sense, but I don't know if we're missing something. To save us teaching ourselves the wrong thing i'll ask my teacher tomorrow and see what he says...

    CD223 I did the same earlier

    Will keep you all updated if nothing else emerges in the meantime
    If you can, let us know the reason behind why it's B!


    Posted from TSR Mobile
 
 
 
Poll
If you won £30,000, which of these would you spend it on?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.