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OCR Physics B...Synoptic Paper (Anti-Neutrino's) watch

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    The last question was why cant satalites be only 10km above the EARTHS surface, never heard of ducks flying that high though :confused: maybe it was a lost duck
    Some of it was on photons.
    I had problems with the number of absorbed neutrinos in a person mass 65kg.
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    I had some number x 10^(-11) grays for the amount of radiation absorbed. It was funny comparing everyone's estimates for the cross-sectional area of a person afterwards. Mine was about 3 times smaller than some other person's.

    I thought the paper was too easy...the grade boundaries are going to be pretty high, which I hate, because all my little mistakes always get amplified.
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    the question about sattelites 10km up I would answer as to be out of the atmosphere and not to lose kinetic energy (and fall) due to air resistance
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    Some1 i know put 3m^2 :rolleyes: idiot
    I put 0.75m^2,
    I think im probably pretty close to reality with that.
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    (Original post by Indelible)
    Some1 i know put 3m^2 :rolleyes: idiot
    I put 0.75m^2,
    I think im probably pretty close to reality with that.
    Well, for an estimate of Rik Waller's surface area, that sounds about right.
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    why couldnt you use red shift to find the distance of that star???? and what was rong with the orbit? other than that though, piece o piss
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    (Original post by peebs)
    why couldnt you use red shift to find the distance of that star????
    red shift is used to find the velocity of the star, not its distance
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    couldn't you use this?

    z=(Hxd)/c

    z = red shift thingy
    H = hubble's constant thingy
    d = distance?
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    (Original post by keithy)
    couldn't you use this?

    z=(Hxd)/c

    z = red shift thingy
    H = hubble's constant thingy
    d = distance?
    no, because that applies to galaxies, not stars.
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    but isnt the v of the star receding porpotional to the distance of it?
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    I used 1 m^2 for the area, that way my answer was easy to work out.
 
 
 

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