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Sea Dynamics Question
 
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The following problem was given to cadets at naval academy to have a check on their knowledge of sea dynamics.

A ship is at anchor. Over the side hangs a rope ladder with rungs a foot apart. The tide rises at the rate of eight inches an hour. At the end of six hours how much of the ladder will remain above water when the tide begins to rise?

The answer is as follows. Since the ship's afloat, the water level in relation to the ship stays the same. Therefore, the same length of ladder will be above water at the end as at the beginning.


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