Acord of mass 0.75 kg is stretched between two supports 7.2 m apart. part a if the tension in the cord is 150 n , how long will it take a pulse to travel from one support to the other?

The speed of a standing wave in a string is given by

where T is the tension of the string and is the linear mass density, with m being the mass of the string and L its length. Substituting into the first formula, and using the values given by the exercise, we can find the speed of the wave


So now we can calculate how long does a pulse take to travel from one support to the other: the distance is 7.2 m, the speed is 37.9 m/s, and this is a uniform linear motion, so the time is given by

Pe = 1/2k(x)^2  and .05n/m = .05x10^-9m = x