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Homework Help: How do I calculate the frequencies of the following?

  1. Nov 20, 2012 #1
    7. A steel wire in a piano has a length of 0.9000 m and a mass of 4.000 10-3 kg. To what tension must this wire be stretched so that the fundamental vibration corresponds to middle C (fC = 261.6 Hz on the chromatic musical scale)?

    8. The human ear canal is about 2.6 cm long. If it is regarded as a tube open at one end and closed at the eardrum, what is the fundamental frequency around which we would expect hearing to be most sensitive?
  2. jcsd
  3. Nov 20, 2012 #2
    Do I use:

    f = TM/L√2L
  4. Nov 20, 2012 #3
    For the first one I got T = 49888794.74
  5. Nov 20, 2012 #4
    Oh wait the first one is T = 985 N
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