The primary function of the liquid oxygen machine described is to convert one form of matter into another. What is the input and output of this system?

Input: Liquid air, Output: Gaseous oxygen

Input: Gaseous air, Output: Liquid oxygen

Input: Solid oxygen, Output: Liquid oxygen

Input: Gaseous air, Output: Gaseous oxygen

A home refrigerator is a system that keeps food cold. If one of its interacting parts, like the compressor, were to fail, what would be the most likely outcome?

The refrigerator would start freezing the food instead of just cooling it.

The system's goal would change to heating the food.

The system would fail to achieve its goal of keeping the food cold.

The other parts of the refrigerator would work harder and become more efficient.