Homework Help: physics

Posted by diamond on Friday, November 16, 2012 at 1:23am.

A phone cord is 4.25 m long. The cord has a mass of 0.200 kg. A transverse wave pulse is produced by plucking one end of the taut cord. The pulse makes four trips down and back along the cord in 0.780 s. What is the tension in the cord?

physics - drwls, Friday, November 16, 2012 at 4:32am
The wave speed is
v = 2*4*4.25/0.78 = 43.5 m/s

The mass per unit length of the cord is a = 0.04706 kg/m

The wave speed is related to tension force T by the equation

v = sqrt(T/a)

Solve for T

T = a v^2 = 89 Newtons

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