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A tsunamiis a fast-moving ocean wave caused by an underwater earthquake. The water first goes down from its normal level, then rises an equal distance above its normal level, and finally returns to its normal level. The period is about 15 minutes. Suppose a tsunami with an amplitude of 10 meters approaches a pier where the normal depth of the water is 9 meters.
a)If the water depth varies sinusoidally with time as the tsunami passes predict the water depth at the following times after the tsunami hits the pier. 2 minutes. 4 minutes. 12 minutes.
b)what will the minimum depth of the water be
c)between what two times is there no water at the pier
d)if a tsunami travels at 1200 kilometers per hour what is its wavelength

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