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A horizontal cord 5.00 m long has a mass of 1.45 g. What must be the...

A horizontal cord 5.00 m long has a mass of 1.45 g. What must be the tension in the cord if the wavelength of a 120 Hz wave on it is to be 60.0 cm? How large a mass must be hung from its end (say over a pulley) to give it this tension? (Please show work and explanation).

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