Waves: two parallel wires how much time til the waves will pass each other

[torrie110]

help fast Waves: two parallel wires how much time til the waves will pass each other

Homework Statement

Two wires are parallel, and one is directly above the other. Each has a length of 40.9 m and a mass per unit length of 0.0208 kg/m. However, the tension in wire A is 51.5 x 102 N, while the tension in wire B is 1.13 x 102 N. Transverse wave pulses are generated simultaneously, one at the left end of wire A and one at the right end of wire B. The pulses travel toward each other. How much time does it take until the pulses pass each other?

Homework Equations

V = sqroot {F/(M/F)}

The Attempt at a Solution

i solved for both velocities of each rope and than got stuck from there

 

[BigJDubs]

. V_A = sqrt(51.5 x 10^2 / (0.0208 kg/m)) = 5.11 m/sV_B = sqrt(1.13 x 10^2 / (0.0208 kg/m)) = 2.25 m/sTime it takes for the pulses to pass each other: 40.9 m / (V_A + V_B) = 40.9 m / (5.11 m/s + 2.25 m/s) = 8.33 s