# Homework Help: Speed of Waves traveling on a taut string

1. Apr 27, 2012

### eagles12

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

v=√(T/M)
M=mass/length

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. Apr 27, 2012

### collinsmark

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.
'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.