How Does Wave Propagation Time Relate to Cable Length and Gravity?

[pcjang]

Homework Statement

Show that the time it takes a wave to propagate up the cable (cable which hangs vertically under its own weight) is t = 2$$\sqrt{L/g}$$, where L is the cable length.

Homework Equations

i think... v=$$\sqrt{F/\mu}$$

The Attempt at a Solution

i've been staring at this problem for about 2 hours now. can anyone just help me how to get started on this one??

 

[Redbelly98]

Homework Equations

i think... v=$$\sqrt{F/\mu}$$

Yes. And F is the tension in the cable.