I think I'd have to give a similar answer to the ocean liner question.
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The ship is exothermic, not only is there no heat available to perform work (in this case moving the boat), but it is venting more heat than it takes in. Theoretically, given time it's drive mechanism would reach absolute zero and lose it's molecular bonds, and take the rest of the ship with it, through thermal transfer. (If we ignore the quantum energy limit, and place the ship in a vacuum, etc. Physicists like to do everything in a vacuum to avoid the real world getting in the way of their theories) If the ship is somehow managing to transfer some of the heat into motion, the effect will be even greater, making the formula more along the lines of Tt=(Ti=20'c(293 K)+Tm=Ev(Ce)) As best I can type it with this keyboard, and 30 years removed from the classroom
(Basically add his calculation to the amount of energy needed to move the boat, with a constant to allow for the energy loss in the conversion of heat to velocity to arrive at the total heat loss per hour)
And here I thought I'd never use any of that stuff .....................