Question: A ship is 150 m long and has a wetted area of 5000 m2. If it is encrusted with barnacles, the ship requires 7000 hp

A ship is 150 m long and has a wetted area of 5000 m2. If it is encrusted with barnacles, the ship requires 7000 hp to overcome friction drag when moving in seawater at 15 kn and 20°C. What is the average roughness of the barnacles? How fast would the ship move with the same power if the surface were smooth? Neglect wave drag.

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