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

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    (Original post by king cobra)
    What about the angle in degrees ?


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    130
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    (Original post by king cobra)
    What about the angle in degrees ?


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    131 i'm praying haha


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    (Original post by king cobra)
    What about the angle in degrees ?


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    131
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    For the ring/cone pendulum did anyone put that it has no impact upon the damping?
    Because damping is the work done by external forces isn't it? and there is no mention of mass in the velocity/acceleration/displacement/time period equations for a pendulum??
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    I got the answers of MC


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    (Original post by poee)
    130 something degrees
    You might lose the mark for significant figures. Has to be 130 exactly.
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    (Original post by king cobra)
    What about the angle in degrees ?


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    131 but rounded it to 2.s.f to 130, will I lose marks?


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    (Original post by Mehrdad jafari)
    I got the answers of MC


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    What did u get ?


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    (Original post by Fvthoms)
    You might lose the mark for significant figures. Has to be 130 exactly.
    i got greater than 130, like 131 or 132
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    POLL FOR THE EXAM ---> http://strawpoll.me/4601163
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    POLL FOR THE EXAM ---> http://strawpoll.me/4601163
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    (Original post by king cobra)
    What did u get ?


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    Very first mcq answer
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    (Original post by poee)
    i got greater than 130, like 131 or 132
    That's still 130 to 2.s.f


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    Any one else get A A A as the first three MC?


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    (Original post by king cobra)
    What about the angle in degrees ?


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    131 ish?
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    my answers i can remember
    forced vibration made by driving force and are in phase, amplitude smaller than at resonance
    resonance is at natural frequency and 90 out of phase amplitude large
    ring did affect the pendulum THIS IS WRONG THOUGH :-(
    RING DOESNT AFFECT DAMPING I DONT THINK
    coulombs law: force of two point charges is inversely proportional to the square of distance and proptional to the product of its charges
    3300 electric field strength
    no. of rotations 0.3 ?
    degress angle 2.2
    tension 12.34
    graph half the current at start then levels out to the same point as other curve
    6 mark
    Quote three laws, mention centripetal force and acceleration, velocity changes
    Not horizontal due to gravitaion force
    unit wb (flux linkage) 0.0608 ? not sure
    4.48v somthing for emf
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    I put that damping was greater with ring because restoring force was proportial to mg, and energy was Fs so energy was mgs which is dependent on mass, high mass means higher energy lost to resistive forces. No idea if its correct, I was babbling
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    (Original post by annierox1863)
    my answers i can remember
    forced vibration made by driving force and are in phase, amplitude smaller than at resonance
    resonance is at natural frequency and 90 out of phase amplitude large
    ring did affect the pendulum THIS IS WRONG THOUGH :-(
    RING DOESNT AFFECT DAMPING I DONT THINK
    coulombs law: force of two point charges is inversely proportional to the square of distance and proptional to the product of its charges
    3300 electric field strength
    no. of rotations 0.3 ?
    degress angle 2.2
    tension 12.34
    graph half the current at start then levels out to the same point as other curve
    6 mark
    Quote three laws, mention centripetal force and acceleration, velocity changes
    Not horizontal due to gravitaion force
    unit wb (flux linkage) 0.0608 ? not sure
    4.48v somthing for emf
    You have the angle in radians there, it asked for degrees
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    (Original post by king cobra)
    What did u get ?


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    Let me go to a coffee shop so that i can take a picture


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    Anyone else notice on the current graph question that the first resistance was 150Ω, but the second was 300KΩ? Think it was probably a typo on AQA's behalf, because the resulting graph would have to start with initial current 2000x lower than the original graph.
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    (Original post by Cmog)
    For the ring/cone pendulum did anyone put that it has no impact upon the damping?
    Because damping is the work done by external forces isn't it? and there is no mention of mass in the velocity/acceleration/displacement/time period equations for a pendulum??
    I put no impact, not sure if its right!
 
 
 
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