Once end of a horizontal string is attached to a small-amplitude mechanical 60-Hz vibrator the string€™s mass per unit length is 3.9 X 10-4 kg/m. The string passes over a pulley, a distance L = 1.50m away, and weights are hung from this end, Fig. 11-53. What mass m must be hung from this end of the string to produce?
(a) Once loop,
(b) Two loops, and
(c) Five loops of a standing wave? Assume the string at the vibrate is a node, which is nearly true?

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1.50 m Vibrator