The second law of thermodynamics states that A. Heat energy can be created and d

Question

The second law of thermodynamics states that A. Heat energy can be created and destroyed B. Heat can flow spontaneously only from a hot source to a clod source C. Heat can flow spontaneously only from a cold source to a hot source D. All the heat inputs to a heat engine can be converted to useful work. A trombone wall in a house is an example of. A. an active solar heating system B. improved insulation is a home heating system C. electricity generation from solar energy D. a positive solar heating system E. concentrated solar power for home energy production An uncontrolled chain reaction can occur in nuclear material when. A. the number of neutrons emitted exceeds the number consumed B. neutrons are moderated by water C. the material is fertile D. the number of neutrons consumed exceeds the number emitted A hydroelectric dam generates electricity when water falls 60.5 m before striking the turbine. Assuming the system is 90% efficient, and that 22 kg of water fall each second, what is the power output of the dam? A. 40.3 kW B. 11.7 kW C. 13.0 kW D. 11, 800J E. 13,000J Which event most accurately describes the conversion of radiant energy to electricity energy? A. The conversion of sunlight in a photovoltaic cell. B. The burning of gasoline to move a car. C. The burning of wood to heat a room. D. The harvesting of wind using a turbine. The two purposes of water in a nuclear reactor core are. A. neutron absorber and neutron moderator B. neutron absorber and lubricant C. neutron moderator and heat transfer liquid D. neutron absorber and heat transfer liquid

Explanation / Answer

Ans. 11. B . Heat can flow spontaneously only from a hot source to a cold source.

The laws of thermodynamics state the relationships between thermal energy and other forms of energy and how the enrgy affects the matter. According to the second law, there is a tendency of a system , to become more disordered or random , by increasing its entropy . Energy always flow spontaneously from high temperature to low temperature , so as to increase the entropy of the new system.

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