Answer from cs61c-be (Tony Yiu 15099596) for Question 2
A phone can be represented as a finite state machine where depeding on different inputs it will ring or not ring. Also an elevator because it has to figure out if the last input was someone requesting it from the outside or someone pressing a destination floor inside it before deciding which floor it will go to or "output." One final example is an alarm clock where the output depends on the state alarm on or off and the input time.