A transverse wave is traveling on a string. The displacement y of a particle from its equilibrium position is given by y = (0.0221 m) sin (28.9t - 2.20x). Note that the phase angle 28.9t - 2.20x is in radians, t is in seconds, and x is in meters. The linear density of the string is 1.87 x 10-2 kg/m. What is the tension in the string? I;m just not sure how density factors into any of this, i'm not sure i need help to solve the problem, just an equation which relates density to waves.