Question: Power plant that uses the temperature gradient of the ocean has been proposed. The system is to operate between 21°C (surface temperature) and 6°C (water temperature at a depth of about 1 km). (a) What is the maximum efficiency of such a system? % (b) If the power output of the plant is 85 MW, what is the minimum thermal energy absorbed per hour? J/h (c) In view of your answer to part (a), do you think such a system is worthwhile?