Q- A wave on a string is described by D(x,t) = (3.0 cm) sin[2π(1 + x/(2.1 m) - t/(0.2 s))].
(a) In what direction is this wave traveling?
(b) What are the wave speed, the frequency, and the wave number?
(c) At t = 0.50 s, what is the displacement of the string at x = 0.20 m?
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