A sinusoidal wave on a string is described by the equation y $=(0\mathrm{.}163$ m$)$ sin $(0\mathrm{.}743$ x $-41\mathrm{.}9$ t$),$ where x and y are in meters and t is in seconds. If the linear mass density of the string is $10\mathrm{.}1$ g$/$m $...$

a$)...$ determine the phase constant.