Two waves traveling in opposite directions along a string fixed at both ends create a standing wave described by $y(x,t)=0\mathrm{.}0113*{10}^{-2}sin(26\mathrm{.}9x)cos(1,250t),$ where $x$ and $y$ are in units of meters and $t$ is in units of seconds. The string has a linear mass density of $0\mathrm{.}0115k\frac{g}{m},$ and the tension in the string is supplied by a mass hanging from one end. The string vibrates in its third harmonic.