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The resistance against a boat is proportional to the velocity. It needs 22 hp to keep...

The resistance against a boat is proportional to the velocity. It needs 22 hp to keep the boat moving at 30 km/hr. The boat's engine turns at 2.1 rev/min when the boat is moving at 40 km/hr. What is the torque on the shaft which drives the propeller? (You may assume that the propeller is 100% efficient.)

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