# Tension, pulse, and time

## Homework Statement

a cord of mass 0.65 Kg is stretched between two supports 28 m apart, The tension of the cord is 150 N, how long will it take a pulse to go from one end to the other?

## Homework Equations

ok, so I really know is: speed of wave=frequency*wavelength....

## The Attempt at a Solution

I really have no clue, I know the distance, with the speed I can solve for frequency, but I don't know how to find time elapsed.... can anyone help me, I have no clue how to use tension in this problem!

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rock.freak667
Homework Helper
the speed of a wave traveling through the string would be

$$v=\sqrt{\frac{T}{\mu}}$$

where $\mu$ is the mass per unit length

oh, cool, yeah i remember seeing that equation somewhere before... right so:
v= (150/(0.65Kg/28m))^.5

take that number, given the length of the cord I can solve for time

rock.freak667
Homework Helper
That should work,yes