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Homework Help: Centripital acceleration (electron movement)

  1. Oct 29, 2007 #1

    ~christina~

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    1. The problem statement, all variables and given/known data
    In bohr model of H atom, speed of electron/ e- is aproximately 2.20x10^6 m/s

    a) find force acting on e- as it revolves in a circular orbit of radius 0.530x10^-10

    b) the centripital acceleration of the e-


    2. Relevant equations
    [tex]\sum F= ma= m(v^2/r)[/tex]


    3. The attempt at a solution

    Well I'm not sure if I'm going in the right direction ...

    does the electron have a x and y component of force?

    a) m e-= 9.109x10^-31 kg

    [tex]\sum F= ma= m(v^2/r)[/tex]

    (9.109x10^-31kg) ( (2.20x10^6)^2/ 0.530x10^-10)= 8.32x10^-8 N

    b)
    [tex] a_c= v^2/r = 9.13x10^ 22 m/s^2 [/tex]

    can someone see if this is alright for me?

    Thanks
     
  2. jcsd
  3. Oct 29, 2007 #2

    Kurdt

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    Looks fine. The force is directed toward the centre of motion.
     
  4. Oct 29, 2007 #3

    ~christina~

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    so there wouldn't be a x /y component of sum of F forces?
     
  5. Oct 29, 2007 #4

    Kurdt

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    What forces are you thiking about?
     
  6. Oct 29, 2007 #5

    ~christina~

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    well I was originally thinking that there was a force in a x or y direction however thinking about it if it's moving in a circular motion but the direction is not specified thus it wouldn't matter for this question.

    Thanks
     
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