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Homework Help: Frequency in two different wires

  1. Feb 20, 2008 #1
    I need help comprehending this one

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

    An aluminum wire. of length L1=60.0cm, cross-section area 1.00 x 10^-2 cm^2, and density 2.60g/cm^3, is joined to a steel wire, of density 7.80g/cm^3 and the same cross-section area. The compound wire, loaded with a block of mass m-10.0kg, is arranged so that the distance L2=86.6cm. Transverse waves are set up on the wire by an external source of variable frequency; a node is located at the pulley. (a) Find the lowest frequency that generates a standing wave having the joint as one of the nodes. (b) How many nodes are observed at this frequency?

    2. Relevant equations and 3. The attempt at a solution

    f= v/(wavelength) = (n x v)/(2L)
    v= (F/(linear density))

    I know the F is 10.0kg x 9.80m/s^2 = 98.0N
    ...for the velocities do you do them saperate or together
    ...how do you get the wavelength
  2. jcsd
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