Question

A. Fill in the blanks in the following paragraph to correctly identify four principles of the

second law of thermodynamics.

Heat naturally flows from an object that has a _____ temperature to an object that has a ____ temperature. Heat can be made to flow in the reverse direction if ____ is done. A machine can never have an efficiency of ____. This means that heat energy can never be fully converted into ____ energy.

Answer 1

Heat naturally flows from an object that has a higher temperature to an object that has a lower temperature. Heat can be made to flow in the reverse direction if work is done. A machine can never have an efficiency of 100%. This means that heat energy can never be fully converted into mechanical energy.

Answer 2

higher, lower, work, 100%, mechanical