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a girl builds two tree houses and stretches a rope between them. she hangs a mass of 1.4 kg on one end of the rope that passes over a pulley. the...

a girl builds two tree houses and stretches a rope between them. she hangs a mass of 1.4 kg on one end of the rope that passes over a pulley. the other end is tied to the other tree house. when she plucks the rope, a wave propogates at 18 m/s. this is too slow, and she desires to increase the wave speed to 30 m/s. what mass should she use?

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