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Thread: HSC Physics Marathon 2016

  1. #201
    Cole World Nailgun's Avatar
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    Re: HSC Physics Marathon 2016

    Quote Originally Posted by Jeff_ View Post
    Quick question:

    There's a question that needs to use the Earth's orbital period.

    I used the orbital period of 23h56mins (converted to seconds), however the sample answer used 24h.

    Would I lose a mark? Because Earth's orbital period is actually 23h56mins?
    You over estimate the HSC lol.
    leehuan, Jeff_ and baktiar77 like this.
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    Cadet Jeff_'s Avatar
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    Re: HSC Physics Marathon 2016

    Quote Originally Posted by Nailgun View Post
    You over estimate the HSC lol.
    Well I think the textbooks say it's 23h56m.

    I think the better way of asking the question was if it's better to use the exact or 24h.

    Some schools can be very pedantic about stuff like these and of the marking criteria says no then there's no point arguing haha!
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  3. #203
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    Re: HSC Physics Marathon 2016



    Hi, can someone explain why this graph shows that it could be both AC and DC? Maybe a trick in the wording of the question (as I thought DC only produces positive emf?)

    This is from the Independent 2013 btw.

    Thanks

  4. #204
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    Re: HSC Physics Marathon 2016

    You're right about DC only producing positive EMF, I have no idea...
    What does the marking criteria say?

  5. #205
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    Re: HSC Physics Marathon 2016

    Quote Originally Posted by loje View Post


    Hi, can someone explain why this graph shows that it could be both AC and DC? Maybe a trick in the wording of the question (as I thought DC only produces positive emf?)

    This is from the Independent 2013 btw.

    Thanks
    Both AC and DC generators produce AC in the coil! Think about it, 2 identical coils, rotating at identical speeds in an identical magnetic field -- should produce identical EMF (AND THEY DO!)

    AC gets changed into DC via the split ring commutator as it moves from the coil into the external circuit
    Last edited by Fizzy_Cyst; 17 Aug 2016 at 7:14 PM.
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  6. #206
    The lurker. UnbiasedProductivity's Avatar
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    Re: HSC Physics Marathon 2016

    Quote Originally Posted by loje View Post


    Hi, can someone explain why this graph shows that it could be both AC and DC? Maybe a trick in the wording of the question (as I thought DC only produces positive emf?)

    This is from the Independent 2013 btw.

    Thanks
    Because it's a generator. All generators produce AC. DC generators use split ring commutators, to change it into DC. I think. I maybe completely wrong.


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  7. #207
    The lurker. UnbiasedProductivity's Avatar
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    Re: HSC Physics Marathon 2016

    Oh lol. I was right. Now I don't have to worry about my ego being destroyed.


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  8. #208
    Taking a break! dan964's Avatar
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    Re: HSC Physics Marathon 2016

    Thread will be closed. The 2017 marathon is now sticked for easy access.

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