A wave on a string is described by D(x, t) = (2.00 cm) × sin[(12.57 rad/m)x - (638 rad/s)t], where x is in m and t in s. The linear density of the string is 5.00 g/m. What are
a. The string tension?
b. The maximum displacement of a point on the string?
c. The maximum speed of a point on the string?