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At time t = 0 and at position x = 0 m along a string, a rightward (+x dir) traveling sinusoidal wave with frequency of 220 Hz has displacement y = +4.0 mm and transverse velocity vy = -0.75 m/s.

a.) What is the smallest positive phase angle for this wave?

phi+=____rad

b.) What is the amplitude of this wave?

____mm

c.) How long does an observer at x=0 need to wait before a trough (y=-A) arrives?

____ms

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