3. How long could a 2000 Hp motor be operated on the heat energy liberated by 1 mi.' of ocean water when the temperature of the water is lowered by 1 degree Celcius and if all these heat were converted to mechanical energy?
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- 3. A heat engine does 200J of work while exhausting 600J of heat to the cold reservoir. What is theefficiency of the engine?4. Suppose that a nuclear power plant has an efficiency of about 0.34, and generates 1000 MW of power. It is located on the banks of a major river that is 67 m wide near the plant, approximately 3 m deep, and flows at a rate of 0.5 m/s. Suppose that the plant re-routes all of this water into the plant and dumps its waste heat evenly throughout the water, then returns the warmer water to the river. How much warmer is the river downstream of the plant compared to upstream? Water's specific heat is approximately 4184 J/kg/K, and its density is 1000 kg/m³. [Answer: The water is warmer by 4.62 K. This is a lot warmer!]1. A person with a basal metabolic rate of 90 W has a continuous (24-hr) average power output, without any physical exertion, of 90 W. If this person consumes 2500 food calories per day and burns 500 calories per day doing additional physical activity, will they gain or lose weight?
- 46:56 WLwvimdGI A 52-kg package is lifted to the top shelf in a storage bin that is 4 m above the ground floor. How much increase in potential energy does the package get? O 1504733.118 Ib-ft 1937.104 BTU O 2040.48 kJ O 2.04 kJ3. A diesel engine performs 2200 J of mechanical work and discards 4300 J of heat each cycle. (i) How much heat must be supplied to the engine in each cycle? (ii) What is the thermal efficiency of the engine?9) A heat pump is used to move heat from 10°C air outside, to a 22 °C air inside. The practical coefficient of performance of this pump is 4.1, and it uses 12000 J of electric energy. a) Find the energy this system adds to the house. b) Find the theoretical (maximum) coefficient of performance for this system. 5