The figure shows the transverse velocity u versus time t of the point on a string at x = 0, as a wave passes through it. The scale on the vertical axis is set by us = 4 m/s. The wave has form y(x, t) = ymsin(kx - ωt + φ). What is φ , in the range from - π to +π ? (Caution: A calculator does not always give the proper inverse trig function, so check your answer by substituting it and an assumed value of φ into y(x, t) and then plotting the function.)
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The figure shows the transverse velocity u versus time
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