Some Hawaiian tsunamis For an interval of 45 minutes, the tsunamis near Hawaii caused by t...

Some Hawaiian tsunamis For an interval of 45 minutes, the tsunamis near Hawaii caused by the Chilean earthquake of

1960 could be modeled by the equation y = 8 sin , where y is in feet and t is in minutes.

(a) Find the amplitude and period of the waves.

(b) If the distance from one crest of the wave to the next was 21 kilometers, what was the velocity of the wave? (Tidal waves can have velocities of more than 700 km/hr in deep sea water.)