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Homework Help: Resonance Vibrations

  1. Mar 5, 2009 #1


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    1. The problem statement, all variables and given/known data

    A front-loading washing machine is mounted on a thick rubber pad that acts like a spring; the weight W = mg (with g = 9.8 m/s^2) of the machine depresses the pad exactly 0.19 cm. When its rotor spins at ω radians per second, the rotor exerts a vertical force
    Newtons on the machine. Neglecting friction, determine at what speed (in revolutions per minute) resonance vibrations will occur?

    2. Relevant equations

    3. The attempt at a solution
    I have F=kx with the weight as F, so kx=mg. So k/m=g/x. So ω[tex]_{0}[/tex]=[tex]\sqrt{g/x}[/tex] With g=9.8 m/s^2 and x=.0019 m. Then I multiply by 60 to go from seconds to minutes and divide by 2*pi. So I get ω0=686, but this isn't right.
  2. jcsd
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