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A string is stretched between a fixed support and a pulley a distance 103 cm apart. The tension on the string is controlled by a weight hanging from the string below the pulley. An electomechnical vibrator is used to vibrate the string at 120 Hz. When the weight is adjusted to 285 g, the string is found to oscillate in its third standing wave mode (three loops). What is the speed of wave propogation on the string in this mode?
What mass must be suspended from the string to produce instead the second standing wave mode (two loops)?

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