Zeroth, first and second laws; isothermal, adiabatic processes; heat engines; Carnot cycle.
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Q1 · Thermodynamics · HARD
An ideal gas undergoes a cyclic process ABCA where AB is isothermal expansion, BC is adiabatic expansion, and CA is constant volume process. If the work done by the gas in the isothermal process is 600 J and work done on the gas in the adiabatic process is 200 J, then the heat rejected during the constant volume process is
Q2 · Thermodynamics · MEDIUM
In a Carnot engine, the temperature of the source is 400 K and efficiency is 40%. To increase the efficiency to 50%, keeping the sink temperature constant, the source temperature should be