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    in the resistance section of AS physics, what unit is the diameter of the cross section have to be when it is calculated for the cross section area? is it mm, cm or m?
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    metres

    metres is the standard S.I unit of length, if in doubt use metres.
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    (Original post by TheJ0ker)
    metres

    metres is the standard S.I unit of length, if in doubt use metres.
    thanks
 
 
 
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