A typical ocean on the Earth's surface has a depth of 4400 m. (a) Show that the speed of a naturally propagating tidal wave in the ocean is about 200 m/s (750 km/h). (b) Compare this speed with the apparent speed of the lunar tidal- raising force as the Earth rotates. (c) How long would it take for such a wave to travel a distance equal to the circumference of the Earth at the Equator? (d) If such a tidal wave is initiated by the influence of the Moon, can its motion be reinforced continually as the Earth rotates, (i) in principle, and (ii) in practice?

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