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Homework Help: Speed of Waves traveling on a taut string

  1. Apr 27, 2012 #1
    1. The problem statement, all variables and given/known data

    If the string is mass 9.5 m long, has a mass of 55g and is pulled taut with a tension of 6N, how much time does it take for a wave to travel from one end of the string to the other?

    2. Relevant equations


    3. The attempt at a solution

    First I converted 9.5m to 950cm and 55g to .055kg
    then i divided .055/950 and divided 6 by the answer I got for that, and then took the square root. I got 320 as my answer (in 2 sigfigs) but it is saying that is incorrect.
  2. jcsd
  3. Apr 27, 2012 #2


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    Homework Helper
    Gold Member

    Why would you convert to cm units?

    In the SI system of units, the standard units are meters, kilograms, seconds.

    There's nothing wrong with moving to a different system, as long as you are consistent. If you convert length from meters to centimeters, you should also convert Newtons to some other units. Newtons have units of kg m/sec2. So you'd have to convert that to kg cm/sec2.

    But why bother? It's easier to just stick with SI units.
    Now that conversion I can understand. :approve:
    'Sounds like you're trying to calculate the velocity. That's fine: it's an intermediate step. But don't consider it your final answer. The problem statement is asking you for time, not velocity.
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