42) During each cycle of operation, a refrigerator absorbs 230 J of heat from the freezer and expels 356 J of heat to the room. How much work input is required in each cycle? B) 460 J C) 126 J D) 712 J A) 586 J

A heat engine uses two containers held at different temperatures. One container is at 312 K, while the other is kept at 534 K. What is the maximum possible efficiency for this engine? efficiency: terms of use contact us help about us carcers privacy policy MacBook Air

Which of the following statements about a heat engine must be true?   i) Energy is taken in from a cold source and expelled to the hot source  ii) Even an ideal heat engine with no energy loss due to non-conservative forces has an    efficiency lower than 100%   iii) The internal energy of a heat engine must always increase after the process is    complete  iv) The heat engine cannot do more work than the energy taken in A) ii, iii B) ii, iv C) i D) i, ii E) i, iv

The coefficient of performance for a freezer is 8.2 i)How much heat must be extracted by the freezer to expel 2.5 kJ of heat into the reservoir? ii) If the freezer compressor uses 310 J of energy, how much heat is extracted from the reservoir?

How much kinetic energy would I have to generate by rubbing my hands together to light my hands on fire? Utilize an equation that relates to thermodynamics to answer this question.

A thermodynamic process that occurs so rapidly or occurs in a system that is so well insulated and no transfer of energy as heat occurs between the system and its environment is: A) Adiabatic B) isochoric C) isobaric D) isothermal

43) The compressor in a refrigerator performs 580 J of work to remove 160 J of heat from the refrigerator. How much heat is discharged into the kitchen? A) 340 J B) 420 J C) 540 J D) 640 J E) 740 J

An electric power plant uses energy from burning coal to generate steam at 450oC. The plant is cooled by 20oC water from a nearby river. If burning coal provides 100MJ of heat, what is the theoretical minimum amount of heat that must be transferred to the river during the conversion of heat to electric energy? a- 100MJ B- 90MJ c- 60MJ D- 40MJ

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