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26 February, 10:50

Sinusoidal water waves are created 120 km offshore by an earthquake near a small island. observers in helicopters above the island report that the waves have an amplitude of about 2.0 m, a wavelength of 15 m, and a frequency of about 0.5 hz. how long do lifeguards on the mainland have to evacuate beaches before the waves arrive?

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  1. 26 February, 10:52
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    Should be about 1hr 13mins
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