Find the efficiency of a heat engine that absorbs 2500 J of energy from a hot reservoir and exhausts 1000 J to a cold reservoir during a cycle. Suppose a woman does 500 J of work and 9000 J of heat transfer occurs into the environment in the process.  What is the decrease in her internal energy, assuming no consumption of food?

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First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of energy. Energy transfer is something that we encounter in day-to-day life. Automobiles, chemical reactions, refrigerators, and power generators work on the basis of thermodynamic principles.