The first statement correctly relates the 1st and 2nd laws of thermodynamics.
Explanation:
- The first law of thermodynamics states that energy is conserved in whatever form it is, and so energy is neither created nor destroyed.
- It establishes the relation between the various forms of energy in a system.
- The second law of thermodynamics talks entropy and how work is done when energy is exchanged.
- In all heat exchanges, heat is transferred from the warm body to the cooler one.
- So the statement that correctly relates both these laws is Thermal-energy flow between objects is conserved and always flows from the warmer object to the cooler object.