A wave traveling along a string is described by y(x,r) (0.00327 m) sin(72.1x -2.72) in which the numerical constants arc in SI units (72.1 rad/m and 2.72 rad/s). (a) What is the transverse velocity u of the string element at x 22.5 cm at time18.9 s? (This velocity, which is associated with the transverse oscillation of a string element, is parallel to the y axis. Don't confuse it with v the constant velocity at which the wave form moves along the x axis.)

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