(Answered) A long is moved up and down with simple harmonic motion

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A long is moved up and down with simple harmonic motion with a frequency of 46Hz. The string is 579m long and has a total mass is 46.3 kg. The string is under a tension of 3423N and is fixed at both ends.

a. Determine the velocity of the wave on the string

b. What length of string, fixed at both ends, would create third harmonic standing wave?

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