Zeroth, first and second laws, isothermal/adiabatic processes, heat engines, refrigerators and entropy at school level.
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Q1 · Second Law and Engines · EASY
A heat engine operates between two reservoirs at temperatures 600 K and 300 K. What is the maximum possible efficiency of this engine?
Q2 · First Law and Processes · MEDIUM
An ideal gas undergoes an adiabatic process. If the volume is reduced to half its initial value and the ratio of specific heats γ = 1.4, by what factor does the pressure increase?
Q3 · Thermodynamics · MEDIUM
An ideal gas undergoes an adiabatic expansion from volume V to 2V. If the initial pressure is P and the adiabatic index is γ = 5/3, what is the final pressure?