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  1. rumborak

    Charge q

    But the problem as you describe it make no sense. You already know the value of q, why do you need to calculate it again? Also, please spend more time writing your responses.
  2. rumborak

    Charge q

    That sounds like a homework question, you should probably take it there. Also, I don't understand the setup; you say a charge "q" is placed in the middle. So, isn't the value of q .... q?
  3. rumborak

    How to make successful helmet from scratch

    The thing to optimize in the helmet will be the deceleration of the head. So, to some degree you will be bound by very basic physics. E.g. if the helmet is of thickness d, the smallest deceleration from speed v will be a continuous declaration across that distance d, the deceleration given by a...
  4. rumborak

    How to make successful helmet from scratch

    Any constraints to the design? You could go Dark Helmet, that would certainly be safe (but obviously rather impractical).
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