First & Second Law of Thermodynamics, Entropy question bank (Thermodynamics & Thermal Sciences)

[First & Second Law of Thermodynamics, Entropy Concept 6] A Carnot heat engine operates between source temperature $T_H = 800\text{ K}$ and sink temperature $T_L = 400\text{ K}$. It rejects $1200\text{ kJ}$ of heat to the sink. What is the net mechanical work output developed by the engine?

[First & Second Law of Thermodynamics, Entropy Concept 16] A Carnot heat engine operates between source temperature $T_H = 800\text{ K}$ and sink temperature $T_L = 400\text{ K}$. It rejects $1200\text{ kJ}$ of heat to the sink. What is the net mechanical work output developed by the engine?