Recent content by runran

  1. R

    Velocity of an ion given the potential difference it is accelerated through?

    Ok, thanks to you both =) I think I can hash out an answer now.
  2. R

    Velocity of an ion given the potential difference it is accelerated through?

    I'm trying to find the mass of an unknown ion and I think the equation I'm down to to find the mass only requires me to determine the velocity before I can calculate mass -- but I don't know how. Could anyone help me out and direct me to an equation(s) that would help me find the velocity of...
  3. R

    Am I missing something? (stored energy U=.5QV)

    Woops, meant to put Q as .02E-6 c But thanks Hootenanny for the reassurance that the solution is okay. A cookie for you (::)
  4. R

    Am I missing something? (stored energy U=.5QV)

    So there's this problem where they provide charge on each plate of .02E-9 Coulombs with a potential difference of 240 V. Parallel plates separated by .0004m air. Asks for energy stored in capacitator. I used U=.5QV equation to get 2.4E-6 J but didn't use the .0004 constant at all. Did I miss...
  5. R

    Help calculating charge of Cl- and K+ ions

    O. I guess I was making it harder than it needed to be. Sorry, that was stupid now. Thank you : )
  6. R

    Help calculating charge of Cl- and K+ ions

    Sorry if this is a ridiculously simple problem, but I don't get it. The professor didn't give examples of how to do this and it's been years since I've taken science courses. I have to determine the electric force (Coulomb's Law) on the K+ ion due to the Cl- ion 9E-10m away. How do you...
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