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Homework Help: Spring with 2 masses rotating and vibrating

  1. May 9, 2012 #1
    1. The problem statement, all variables and given/known data

    Consider an object consisting of two balls connected by a spring, whose stiffness is 400N/m.
    The object has been thrown through the air
    and is rotating and vibrating as it moves. At
    a particular instant the spring is stretched
    0.3m, and the two balls at the ends of the
    spring have the following masses and velocities:

    m1= 1.4kg v1= <5.5, -5.5, 0>
    m2=3.4 kg v2=<-13.5, 8, 0>

    What is x and y components of V(center mass)?
    What is K total=?

    2. Relevant equations
    Ktot= K trans + K rel
    Psys= M(total)V(cm)
    U=1/2 kx^2
    Ke=1/2 mv^2
    Ke= 1/2 I w^2

    3. The attempt at a solution:

    I tried to just solve for center of mass and apply x and y velcoities but it didnt work.
  2. jcsd
  3. May 10, 2012 #2


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    What is that supposed to mean? Show your work.
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