The vertical displacement of an ocean wave is described by the function, y = A sin(ωt - kx). k is called the wave number (k = 2π/λ) and has a value of k = 19 rad/m. The remaining values are A = 4.5 m and ω = 15.5 rad/s. What is the wave's amplitude in m?

Physics for Scientists and Engineers, Technology Update (No access codes included)
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Author:Raymond A. Serway, John W. Jewett
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Chapter18: Superposition And Standing Waves
Section: Chapter Questions
Problem 18.9P: Two traveling sinusoidal waves are described by the wave functions y1 = 5.00 sin [(4.00x 1 200t)]...
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 The vertical displacement of an ocean wave is described by the function, y = A sin(ωt - kx). k is called the wave number (k = 2π/λ) and has a value of k = 19 rad/m. The remaining values are A = 4.5 m and ω = 15.5 rad/s.

What is the wave's amplitude in m? 

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