second law of thermodynamics

A heat engine extracts heat (𝑄 H ) from a thermal reservoir at a temperature of 1000 K and rejects heat (𝑄 L ) to a thermal reservoir at a temperature of 100 K, while producing w...

A reversible cycle receives $$40$$ $$kJ$$ of heat from one heat source at a temperature of $${127^ \circ }C$$ and $$37$$ $$kJ$$ from another heat source at $${97^ \circ }C.$$ The h...